NCBI Conserved Domain Search

Pleckstrin homology domain;

Pssm-ID: 465218 Cd Length: 143 Bit Score: 267.72 E-value: 8.19e-83

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1431 VQCEGLAEQLIFNSLTNCLGPRKLLYSGKLYKTKSNKELHGFLFNDFLLLTYLVRQFAaSSGFEKLFSSKSSAQFKMYKT 1510
Cdd:pfam16652    1 VQCEGLSEQLVFNSLTNCLGPRKLLHSGKLYKVKSNKELVGFLFNDFLLLTQPVKPLS-SAGTDKLFSSKSNIQYKMYKT 79

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1511 PIFLNEVLVKLPTDPSSDEPVFHISHIDRVYTLRTDNINERTAWVQKIKAASEQYIDTEKKKRE 1574
Cdd:pfam16652   80 PIFLNEVMVKLPTDPSSSEPTFQLSHIDRVYTLKAESPNERTAWVKKIKEASELYIETEKKKRE 143

Intersectin Pleckstrin homology (PH) domain; ITSNs, an adaptor protein family, play a role in endo- and exocytosis, actin cytoskeleton rearrangement and signal transduction. There are two human ITSN genes: ITSN1 and ITSN2. They share significant sequence identity and a similar domain structure having both short and long isoforms produced by alternative splicing. The short isoform (ITSN-S) consists of two Eps15 homology domains (EH1 and EH2), a coiled-coil region (CCR) and five Src homology 3 domains (SH3A-E). The EH domains bind to Asn-Pro-Phe motifs and are implicated in endocytosis and vesicle transport. The SH3 domains bind to proline-rich sequences and are commonly found in proteins implicated in cell signalling pathways, cytoskeletal organization and membrane traffic. The long isoform (ITSN-L) contains three additional C-terminal domains, a Dbl homology domain (DH), a Pleckstrin homology domain (PH) and a C2 domain. The tandem DH-PH domains are present in all Dbl family of GEFs. ITSN acts specifically on Cdc42 through its DH domain with no portion of the PH domain making contact with Cdc42. This is in contrast to Dbs which requires the PH domain for full catalytic activity. The ITSN PH domain binds phosphoinositides. C2 domains are usually involved in Ca2+-dependent and Ca2+-independent phospholipid binding. There are more than 30 proteins that interact with ITSNs. ITSN-S is present in mammals, frogs, flies and nematodes, while ITSN-L is present only in vertebrates. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270084 Cd Length: 132 Bit Score: 236.58 E-value: 3.94e-72

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1439 QLIFNSLTNCLGPRKLLYSGKLYKTKSNKELHGFLFNDFLLLTYLVRQFAaSSGFEKLFSSKSSAQFKMYKTPIFLNEVL 1518
Cdd:cd13264      1 QLIFNSVTNCLGPRKFLHSGKLYKAKSNKELYGFLFNDFLLLTQPIKPLG-SSGNDFVFDNKANIQYKMYKTPIFLNEVL 79

                           90       100       110       120       130
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1519 VKLPTDPSSDEPVFHISHIDRVYTLRTDNINERTAWVQKIKAASEQYIDTEKK 1571
Cdd:cd13264     80 VKLPTDPSGDEPIFHISHIDRVYTLRAESINERTAWVQKIKAASELYIETEKK 132

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains. Improved coverage.

Pssm-ID: 214619 [Multi-domain] Cd Length: 180 Bit Score: 160.54 E-value: 7.17e-45

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  1233 IHELIETEERYMDDLQLVIEVFQKRM-AESGFLTEAEMALIFVNWKELIMSNTKLLKALRVRKKTggEKMPVEMMGDILA 1311
Cdd:smart00325    2 LKELLQTERNYVRDLKLLVEVFLKPLkKELKLLSPNELETLFGNIEEIYEFHRDFLDELEERIEE--WDDSVERIGDVFL 79

                            90       100       110       120       130       140       150       160
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  1312 AELSHMQAYIRFCSCQLNGAALLQQKtDEDADFKEFLKKLASDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENTPQNH 1391
Cdd:smart00325   80 KLEEFFKIYSEYCSNHPDALELLKKL-KKNPRFQKFLKEIESSPQCRRLTLESLLLKPVQRLTKYPLLLKELLKHTPEDH 158

                           170       180
                    ....*....|....*....|..
gi 1958785258  1392 VDHSSLKLALERAEELCSQVNE 1413
Cdd:smart00325  159 EDREDLKKALKAIKELANQVNE 180

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 238091 [Multi-domain] Cd Length: 181 Bit Score: 158.62 E-value: 3.25e-44

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1229 RQGYIHELIETEERYMDDLQLVIEVFQKRMAESG-FLTEAEMALIFVNWKELIMSNTKLLKALRVRKKTGGekMPVEMMG 1307
Cdd:cd00160      1 RQEVIKELLQTERNYVRDLKLLVEVFLKPLDKELlPLSPEEVELLFGNIEEIYEFHRIFLKSLEERVEEWD--KSGPRIG 78

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1308 DILAAELSHMQAYIRFCSCQLNGAALLQQKTDEDADFKEFLKKLasDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENT 1387
Cdd:cd00160     79 DVFLKLAPFFKIYSEYCSNHPDALELLKKLKKFNKFFQEFLEKA--ESECGRLKLESLLLKPVQRLTKYPLLLKELLKHT 156

                          170       180
                   ....*....|....*....|....*
gi 1958785258 1388 PQNHVDHSSLKLALERAEELCSQVN 1412
Cdd:cd00160    157 PDGHEDREDLKKALEAIKEVASQVN 181

RhoGEF domain; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that pfam00169 domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 459876 [Multi-domain] Cd Length: 176 Bit Score: 157.85 E-value: 5.91e-44

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1233 IHELIETEERYMDDLQLVIEVFQKRMAESGFLTEAEMALIFVNWKELIMSNTKLLkaLRVRKKtggEKMPVEMMGDILAA 1312
Cdd:pfam00621    2 IKELLQTERSYVRDLEILVEVFLPPNSKPLSESEEEIKTIFSNIEEIYELHRQLL--LEELLK---EWISIQRIGDIFLK 76

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1313 ELSHMQAYIRFCSCQLNGAALLQQKTDEDADFKEFLKKLASDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENTPQNHV 1392
Cdd:pfam00621   77 FAPGFKVYSTYCSNYPKALKLLKKLLKKNPKFRAFLEELEANPECRGLDLNSFLIKPVQRIPRYPLLLKELLKHTPPDHP 156

                          170       180
                   ....*....|....*....|
gi 1958785258 1393 DHSSLKLALERAEELCSQVN 1412
Cdd:pfam00621  157 DYEDLKKALEAIKEVAKQIN 176

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 132.30 E-value: 1.37e-36

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  780 LVNYRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11988      1 LVNYRALYPFEARNHDEMSFNAGDIIQVDEKTVGEPGWLYGSFQGNFGWFPCNYVEK 57

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 127.40 E-value: 5.39e-35

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1149 CQVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11996      1 CQVIAMYDYTANNEDELSFSKGQLINVLNKDDPDWWQGEINGVTGLFPSNYVKM 54

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 128.55 E-value: 6.72e-35

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258    15 MWAITSEERTKHDKQFDNLKPSG-GYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLIKLKLQGQ 93
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKNQdGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

                            90
                    ....*....|....
gi 1958785258    94 QLPVVLPPIMKQPP 107
Cdd:smart00027   81 PIPASLPPSLIPPS 94

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 126.20 E-value: 2.04e-34

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARGKKRQKGWFPASHVKLL 1134
Cdd:cd11994      1 IAQVTTAYVASGVEQLSLSPGQLILILKKNSSGWWLGELQARGKKRQKGWFPASHVKLL 59

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 121.69 E-value: 5.47e-33

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11990      1 KAQALCSWTAKKDNHLNFSKNDIITVLEQQENWWFGEVHGGRGWFPKSYVKL 52

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 120.89 E-value: 1.24e-32

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11992      1 EYIALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVRP 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 117.07 E-value: 2.44e-31

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11836      2 YRALYAFEARNPDEISFQPGDIIQVDESQVAEPGWLAGELKGKTGWFPANYVEK 55

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 113.97 E-value: 2.95e-30

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARGKKRQKGWFPASHVKL 1133
Cdd:cd11839      1 IAQVIAPFTATAENQLSLAVGQLVLVRKKSPSGWWEGELQARGKKRQIGWFPANYVKL 58

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 114.06 E-value: 3.73e-30

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1072 KKPEIAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARGKKRQKGWFPASHVKLLGP 1136
Cdd:cd11993      1 KKPEIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKLLSP 65

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 112.51 E-value: 1.10e-29

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11840      1 QVIALFPYTAQNEDELSFQKGDIINVLSKDDPDWWRGELNGQTGLFPSNYVEP 53

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 112.12 E-value: 1.11e-29

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11838      1 EYIALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVRP 52

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 112.37 E-value: 3.32e-29

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258   238 EWAVPQPSRLKYRQKFNSLDKSMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLTDMAKAGQ 317
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKNQDGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 105.04 E-value: 3.99e-27

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1149 CQVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11995      1 CQVIGMYDYTAQNDDELAFSKGQIINVLNKEDPDWWKGELNGQVGLFPSNYVKL 54

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 101.29 E-value: 7.19e-26

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGR-GWFPKSYVKI 972
Cdd:cd11837      1 TATALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELEGGEeGWFPKSYVKE 53

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 97.68 E-value: 2.39e-24

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  249 YRQKFNSLDKSMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLTDMAKA 315
Cdd:cd00052      1 YDQIFRSLDPDGDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 96.13 E-value: 6.98e-24

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258   27 DKQFDNLKPSG-GYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLIKLKLQ 91
Cdd:cd00052      2 DQIFRSLDPDGdGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 95.07 E-value: 1.58e-23

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11987      2 YRALYPFEARSHDEITIQPGDIVMVDESQTGEPGWLGGELKGKTGWFPANYAEK 55

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 93.89 E-value: 3.22e-23

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11991      1 EYVAMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 89.39 E-value: 1.14e-21

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11989      1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 52

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 82.97 E-value: 2.38e-19

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  1148 VCQVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN-GVTGLFPSNYVK 1201
Cdd:smart00326    2 GPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRLGrGKEGLFPSNYVE 56

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 81.21 E-value: 1.00e-18

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11826      2 VVALYDYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGVTGLFPGNYV 51

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 80.58 E-value: 1.26e-18

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN-GVTGLFPSNY 1199
Cdd:cd00174      1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELNgGREGLFPANY 51

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 79.59 E-value: 3.70e-18

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11805      1 RVQALYDFNPQEPGELEFRRGDIITVLDSSDPDWWKGELRGRVGIFPANYVQ 52

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 77.00 E-value: 3.07e-17

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11823      4 ALYSYTANREDELSLQPGDIIEVHEKQDDGWWLGELNGKKGIFPATYV 51

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 76.04 E-value: 7.27e-17

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258   783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 835
Cdd:smart00326    5 VRALYDYTAQDPDELSFKKGDIITVLEKS--DDGWWKGRLGrGKEGLFPSNYVE 56

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 73.12 E-value: 6.95e-16

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11877      2 VRAKFNFEGTNEDELSFDKGDIITVTQVVEG--GWWEGTLNGKTGWFPSNYVK 52

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 72.35 E-value: 1.21e-15

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11877      1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGKTGWFPSNYVK 52

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 72.26 E-value: 1.32e-15

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDGWWEGINTGRTGLVPANYVE 49

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 71.73 E-value: 2.25e-15

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1148 VCQViaMYDYIANNEDELNFSKGQLINVMNKDDPD--WWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12142      1 YCRV--LFDYNPVAPDELALKKGDVIEVISKETEDegWWEGELNGRRGFFPDNFVMP 55

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 70.46 E-value: 4.72e-15

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKD-DPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11804      3 VAKHDFKATAEDELSFKKGSILKVLNMEdDPNWYKAELDGKEGLIPKNYI 52

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 70.42 E-value: 7.59e-15

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11972      4 KVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNGVTGLFPGNYVE 55

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 70.07 E-value: 8.18e-15

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11875      4 VLFDYEAENEDELTLREGDIVTILSKDceDKGWWKGELNGKRGVFPDNFVE 54

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 69.87 E-value: 9.36e-15

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  1001 VGEEYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIG-ERTGIFPSNYVR 1054
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKsDDGWWKGRLGrGKEGLFPSNYVE 56

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 69.49 E-value: 1.13e-14

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258   921 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGR-GWFPKSYVK 971
Cdd:smart00326    4 QVRALYDYTAQDPDELSFKKGDIITVLEKSDdGWWKGRLGRGKeGLFPSNYVE 56

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 69.08 E-value: 1.48e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI-NGVTGLFPSNYV 1200
Cdd:cd11812      2 VVALYDYTANRSDELTIHRGDIIRVLYKDNDNWWFGSLvNGQQGYFPANYV 52

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 68.71 E-value: 2.30e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11949      2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDPNWWKGACHGQTGMFPRNYVT 52

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 68.87 E-value: 2.38e-14

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11772      4 ALYDYEAQHPDELSFEEGDLLYISDKSDPNWWKATCGGKTGLIPSNYV 51

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 68.44 E-value: 3.04e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVkmTTD 1205
Cdd:cd11964      2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDPNWWKGETPQGTGLFPSNFV--TAD 55

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 67.87 E-value: 3.64e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNY 833
Cdd:cd00174      2 ARALYDYEAQDDDELSFKKGDIITVLEKD--DDGWWEGELNgGREGLFPANY 51

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 68.01 E-value: 3.91e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKII 973
Cdd:pfam07653    1 YGRVIFDYVGTDKNGLTLKKGDVVKVLGKdNDGWWEGETGGRVGLVPSTAVEEI 54

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 67.52 E-value: 6.21e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11951      2 VQAQYDFSAEDPSQLSFRRGDIIEVLDCPDPNWWRGRISGRVGFFPRNYV 51

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 66.72 E-value: 1.05e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11820      2 KVRALYDFEAAEDNELTFKAGEIITVLDDSDPNWWKGSNHRGEGLFPANFVT 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 66.68 E-value: 1.13e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDG---EWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11842      3 VALYDFAGEQPGDLAFQKGDIITILKKSDsqnDWWTGRIGGREGIFPANYVE 54

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 66.72 E-value: 1.25e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSI-GERTGIFPSNY 1052
Cdd:cd00174      2 ARALYDYEAQDDDELSFKKGDIITVLEKdDDGWWEGELnGGREGLFPANY 51

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 66.97 E-value: 1.32e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11971      1 KVVAIYDYSKDKDDELSFMEGAIIYVIKKNDDGWYEGVCNGVTGLFPGNYVE 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 66.39 E-value: 1.48e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11950      1 QVRALYDFEALEDDELGFNSGDVIEVLDSSNPSWWKGRLHGKLGLFPANYVA 52

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 66.28 E-value: 1.50e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11827      1 QCKALYAYDAQDTDELSFNEGDIIEILKEDPSGWWTGRLRGKEGLFPGNYV 51

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 66.14 E-value: 1.65e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11873      2 VIVEFDYDAEEPDELTLKVGDIITNVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 66.20 E-value: 1.84e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1149 CQVIamYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11874      2 CKVL--FSYTPQNEDELELKVGDTIEVLGEVEEGWWEGKLNGKVGVFPSNFVKE 53

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 66.13 E-value: 1.89e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11766      1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNGQVGWFPSNYV 51

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 66.08 E-value: 1.96e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1149 CQVIamYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12057      2 CKVL--FPYEAQNEDELTIKEGDIVTLISKDciDAGWWEGELNGRRGVFPDNFVKL 55

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 67.40 E-value: 2.60e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258   30 FDNLKPSGGYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLI 86
Cdd:pfam12763   16 FSGLKPENNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLI 72

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 65.83 E-value: 2.70e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11823      3 KALYSYTANREDELSLQPGDIIEVHEK--QDDGWWLGELNGKKGIFPATYVE 52

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 65.70 E-value: 2.84e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGETGGRVGLVPSTAVE 52

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 65.40 E-value: 3.13e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11772      2 FRALYDYEAQHPDELSFEEGDLLYISDKS--DPNWWKATCGGKTGLIPSNYVE 52

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 65.48 E-value: 3.31e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12061      2 VRAKFNFQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGRTGWFPSNYVR 52

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 65.18 E-value: 3.40e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGR-GWFPKSY 969
Cdd:cd00174      1 YARALYDYEAQDDDELSFKKGDIITVLEKDdDGWWEGELNGGReGLFPANY 51

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 65.45 E-value: 3.54e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11875      2 ARVLFDYEAENEDELTLREGDIVTILSKDCEDKGWWKGELNGKRGVFPDNFVE 54

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 65.33 E-value: 3.57e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEES--EDGWWEGINTGRTGLVPANYVE 49

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 64.53 E-value: 5.08e-13

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE-INGVTGLFPS 1197
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRnKGGKEGLIPS 47

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 64.86 E-value: 6.31e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1148 VCQVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11956      1 EVEAVACFDYTGRTAQELSFKRGDVLLLHSKASSDWWRGEHNGMRGLIPHKYI 53

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 64.57 E-value: 7.69e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11805      4 ALYDFNPQEPGELEFRRGDIITVLDSsDPDWWKGELRGRVGIFPANYVQP 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 64.37 E-value: 7.96e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDP--DWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11842      1 KAVALYDFAGEQPGDLAFQKGDIITILKKSDSqnDWWTGRIGGREGIFPANYVE 54

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 64.20 E-value: 8.74e-13

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11803      5 ALYDFEPENEGELGFKEGDIITLTNQIDENWYEGMVNGQSGFFPVNYV 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 64.24 E-value: 9.63e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIqVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11882      3 RALYACKAEDESELSFEPGQII-TNVQPSDEPGWLEGTLNGRTGLIPENYVE 53

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 64.08 E-value: 1.01e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11961      2 AKALYDYDAAEDNELSFFENDKIINIEFVDDDWWLGECHGSRGLFPSNYVEL 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 64.27 E-value: 1.03e-12

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                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVkmTTD 1205
Cdd:cd11963      3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDANWWKGENHRGVGLFPSNFV--TTD 56

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 63.55 E-value: 1.35e-12

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11824      3 SVLYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVERNGQKGLVPGTYLE 52

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 63.96 E-value: 1.40e-12

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                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD----WWQGEINGVTGLFPS 1197
Cdd:cd11762      4 ALYDYEAQSDEELSFPEGAIIRILRKDDNGvddgWWEGEFNGRVGVFPS 52

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 65.09 E-value: 1.59e-12

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  248 KYRQKFNSLdKSMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLT-DM 312
Cdd:pfam12763   11 KYWEIFSGL-KPENNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLIfDL 75

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 63.59 E-value: 1.69e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11959      3 VALYDYQAADDDEISFDPDDIITNIEMIDEGWWRGVCRGKYGLFPANYVEL 53

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 63.47 E-value: 1.89e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVT-QKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11772      2 FRALYDYEAQHPDELSFEEGDLLYISdKSDPNWWKATCGGKTGLIPSNYV 51

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 62.99 E-value: 2.14e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12052      1 EAIVEFDYKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 63.08 E-value: 2.21e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLI-NVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11882      1 RARALYACKAEDESELSFEPGQIItNVQPSDEPGWLEGTLNGRTGLIPENYVE 53

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 62.82 E-value: 2.37e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVmNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11838      3 IALYPYESNEPGDLTFNAGDVILV-TKKDGEWWTGTIGDRTGIFPSNYVR 51

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 63.10 E-value: 2.60e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN-GVTGLFPSNYVKM 1202
Cdd:cd11819      3 KALYDYQAAEDNEISFVEGDIITQIEQIDEGWWLGVNAkGQKGLFPANYVEL 54

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 62.86 E-value: 2.71e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD-----DPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12059      4 AVFDYEASAEDELTLRRGDRVEVLSKDsavsgDEGWWTGKINDRVGIFPSNYVTS 58

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 62.73 E-value: 3.15e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLI-NVMnKDDPDWWQGEING-VTGLFPSNYVK 1201
Cdd:cd11825      2 VKALYDYRAQRPDELSFCKHAIItNVE-KEDGGWWRGDYGGkKQKWFPANYVE 53

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 62.31 E-value: 4.63e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDpDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11991      1 EYVAMYTYESNEQGDLTFQQGDVILVTKKDG-DWWTGTVGDKTGVFPSNYVRP 52

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 62.15 E-value: 5.38e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd12056      5 KALFHYEGTNEDELDFKEGEIILIISKDTGEPGWWKGELNGKEGVFPDNFV 55

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 61.76 E-value: 6.54e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD-----DPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11876      4 ALFDYDARGEDELTLRRGQPVEVLSKDaavsgDEGWWTGKIGDKVGIFPSNYV 56

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 61.64 E-value: 6.63e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11806      2 YVAIADFVATDDSQLSFESGDKLLVLRKPSVDWWWAEHNGCCGYIPASHL 51

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 61.56 E-value: 7.20e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIqVDEKTVGEpGWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11789      2 YRAMYDYAAADDDEVSFQEGDVI-INVEIIDD-GWMEGTVQrtGQSGMLPANYVEL 55

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 61.56 E-value: 8.09e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEING---VTGLFPSNY 1199
Cdd:cd11821      2 VRALYDCQADNDDELTFSEGEIIVVTGEEDDEWWEGHIEGdpsRRGVFPVSF 53

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 61.56 E-value: 9.31e-12

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12060      4 VKARFNFKQTNEDELSVCKGDIIYVTRVEEGGWWEGTLNGKTGWFPSNYVR 54

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 61.28 E-value: 1.01e-11

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11840      3 IALFPYTAQNEDELSFQKGDIINVLSKD--DPDWWRGELNGQTGLFPSNYVE 52

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 61.50 E-value: 1.07e-11

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD-----DPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12058      4 ALYDYEASGEDELSLRRGDVVEVLSQDaavsgDDGWWAGKIRHRLGIFPANYV 56

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 61.25 E-value: 1.13e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV---TQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11841      4 ALYSFEGQQPCDLSFQAGDRITVltrTDSQFDWWEGRLRGRVGIFPANYV 53

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 61.06 E-value: 1.23e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNY 1199
Cdd:cd11845      1 IYVALYDYEARTDDDLSFKKGDRLQILDDSDGDWWLARhlSTGKEGYIPSNY 52

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 60.94 E-value: 1.25e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQargkKRQKGWFPASH 1130
Cdd:cd00174      1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELN----GGREGLFPANY 51

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 60.81 E-value: 1.48e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNK--DDPDWWQ-GEINGVTGLFPSNYV 1200
Cdd:cd11904      3 VQALYPFSSSNDEELNFEKGEVMDVIEKpeNDPEWWKcRKANGQVGLVPKNYV 55

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 60.63 E-value: 1.49e-11

                            10        20        30        40        50        60
                    ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  1073 KPEIAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELqargKKRQKGWFPASHVK 1132
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRL----GRGKEGLFPSNYVE 56

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 60.75 E-value: 1.52e-11

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1149 CQViaMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12054      3 CKV--LFEYVPQNEDELELKVGDIIDINEEVEEGWWSGTLNGKSGLFPSNFVK 53

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 60.85 E-value: 1.63e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd12061      3 RAKFNFQQTNEDELSFSKGDVIHVTRVEEG--GWWEGTHNGRTGWFPSNYVREI 54

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 60.61 E-value: 1.67e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12056      6 ALFHYEGTNEDELDFKEGEIILIISKDtgEPGWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 60.35 E-value: 1.88e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11803      3 CRALYDFEPENEGELGFKEGDIItltnQIDEN------WYEGMVNGQSGFFPVNYVE 53

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 60.40 E-value: 2.09e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNK--DDPDWWQGE-INGVTGLFPSNYVK 1201
Cdd:cd11767      2 VVALYPFTGENDEELSFEKGERLEIIEKpeDDPDWWKARnALGTTGLVPRNYVE 55

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 60.11 E-value: 2.71e-11

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11809      3 TAQFDYTGRSERELSFKKGDSLTLYRQVSDDWWRGQLNGQDGLVPHKYI 51

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 59.62 E-value: 3.59e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1149 CQViaMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12055      2 CQV--AFSYLPQNEDELELKVGDIIEVVGEVEEGWWEGVLNGKTGMFPSNFIK 52

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 59.66 E-value: 3.74e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI---NGVT--GLFPSNYV 1200
Cdd:cd11887      4 VKALYPYESDHEDDLNFDVGQLITVTEEEDADWYFGEYvdsNGNTkeGIFPKNFV 58

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 59.79 E-value: 3.78e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12142      2 CRVLFDYNPVAPDELALKKGDVIEVISKETEDEGWWEGELNGRRGFFPDNFVM 54

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 59.60 E-value: 4.55e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEING-----VTGLFPSNY 1199
Cdd:cd11883      2 VVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISssgkvKRGWFPSNY 55

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 59.43 E-value: 4.65e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGEINGVTGLFPSNY 1199
Cdd:cd11778      2 VEALYDYEAQGDDEISIRVGDRIAVIRGDDGSgWTYGEINGVKGLFPTSY 51

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 59.35 E-value: 4.65e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11827      3 KALYAYDAQDTDELSFNEGDIIEILKEDPS--GWWTGRLRGKEGLFPGNYVEK 53

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 67.86 E-value: 5.35e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  347 SYQKTQEEEPQKKLpvtfEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKR 426
Cdd:PTZ00121  1298 AEEKKKADEAKKKA----EEAKKADEAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAAEKKK 1373

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  427 LEKQRELERQREEERRKEIERRescisfpLMREREwisvyKDRKgfMAELWKPGSCAAKQELERQRRLEweRIRRQELLN 506
Cdd:PTZ00121  1374 EEAKKKADAAKKKAEEKKKADE-------AKKKAE-----EDKK--KADELKKAAAAKKKADEAKKKAE--EKKKADEAK 1437

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  507 QKnreQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCDleimEIKQLQQELQEYQNkli 586
Cdd:PTZ00121  1438 KK---AEEAKKADEAKKKAEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKKKAE----EAKKKADEAKKAAE--- 1507

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  587 ylvpEKQLLNERIKNMQLSNTPDSGISLLHKKSSE--KEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDDSVL 664
Cdd:PTZ00121  1508 ----AKKKADEAKKAEEAKKADEAKKAEEAKKADEakKAEEKKKADELKKAEELKKAEEKKKAEEAKKAEEDKNMALRKA 1583

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  665 QCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRK 744
Cdd:PTZ00121  1584 EEAKKAEEARIEEVMKLYEEEKKMKAEEAKKAEEAKIKAEELKKAEEEKKKVEQLKKKEAEEKKKAEELKKAEEENKIKA 1663

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  745 EEEEKQKRLQEEKSQD--RTQEEERKTE---AKQSETARALVNYRALYPFEARNHDEM 797
Cdd:PTZ00121  1664 AEEAKKAEEDKKKAEEakKAEEDEKKAAealKKEAEEAKKAEELKKKEAEEKKKAEEL 1721

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 59.26 E-value: 5.95e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11884      3 VAVRAYITRDQTLLSFHKGDVIKLlPKEGPLDPGWLFGTLDGRSGAFPKEYVQ 55

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 58.83 E-value: 6.59e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARGKKRQKGWFPASH 1130
Cdd:cd11883      1 VVVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISSSGKVKRGWFPSNY 55

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 59.07 E-value: 6.65e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1148 VCQViAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKMT 1203
Cdd:cd12073      1 ICAV-ALYDYQGEGDDEISFDPQETITDIEMVDEGWWKGTCHGHRGLFPANYVELL 55

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 59.05 E-value: 6.90e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12046      1 QVVALFSYEASQPEDLEFQKGDVILVLSKVNEDWLEGQCKGKIGIFPSAFVE 52

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 58.88 E-value: 7.61e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKD-DPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11946      2 EAIAKYDFKATADDELSFKRGDILKVLNEEcDQNWYKAELNGKDGFIPKNYIEM 55

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 58.49 E-value: 8.61e-11

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYV 1053
Cdd:cd11826      3 VALYDYTADKDDELSFQEGDIIYVTKKNDDgWYEGVLNGVTGLFPGNYV 51

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 58.53 E-value: 9.73e-11

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDpDWWQGEINGVT-GLFPSNYVKM 1202
Cdd:cd11837      1 TATALYPWRAKKENHLSFAKGDIITVLEQQE-MWWFGELEGGEeGWFPKSYVKE 53

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 58.14 E-value: 1.07e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11786      4 ALYNYEGKEPGDLSFKKGDIILLRKRIDENWYHGECNGKQGFFPASYVQ 52

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 58.48 E-value: 1.28e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQ----VDEktvgepGWLYGSFQ--GKFGWFPCNYVE 835
Cdd:cd11935      3 YRAMYDYSAQDEDEVSFRDGDYIVnvqpIDE------GWMYGTVQrtGRTGMLPANYIE 55

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 58.03 E-value: 1.34e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11976      3 KARYDFCARDRSELSLKEGDIIKILNKK-GQQGWWRGEIYGRVGWFPANYVEE 54

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 57.87 E-value: 1.44e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11817      2 AVALYDFTGETEEDLSFQRGDRILVTEHLDAEWSRGRLNGREGIFPRAF 50

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 57.93 E-value: 1.45e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEING-VTGLFPSNYVK 1201
Cdd:cd11969      2 VKALYDYRAKRSDELSFCKGALIHNVSKETGGWWKGDYGGkVQHYFPSNYVE 53

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 57.66 E-value: 1.60e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11766      2 AVVKFNYEAQREDELSLRKGDRVLVLEKS--SDGWWRGECNGQVGWFPSNYVTE 53

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 57.71 E-value: 1.85e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11877      1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEgGWWEGTLNGKTGWFPSNYVKE 53

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 57.21 E-value: 2.22e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTG-SIGERTGIFPS 1050
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKsEDGWWKGrNKGGKEGLIPS 47

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 57.40 E-value: 2.34e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDP--DWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11841      1 EVTALYSFEGQQPCDLSFQAGDRITVLTRTDSqfDWWEGRLRGRVGIFPANYVS 54

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 57.43 E-value: 2.57e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKD-GEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11840      3 IALFPYTAQNEDELSFQKGDIINVLSKDdPDWWRGELNGQTGLFPSNYVEP 53

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 57.37 E-value: 2.94e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd12006      4 VALYDYEARTEDDLSFHKGEKFQILNSSEGDWWEARslTTGETGYIPSNYV 54

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 64.96 E-value: 3.61e-10

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  486 QELERQRRLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCD 565
Cdd:COG1196    219 KEELKELEAELLLLKLRELEAELEELEAELEELEAELEELEAELAELEAELEELRLELEELELELEEAQAEEYELLAELA 298

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  566 LEIMEIKQLQQELQEYQNKLIYLVPEKQLLNERIKNmqlsntpdsgisllhkkssEKEELcQRLKEQLDALEKETASKLS 645
Cdd:COG1196    299 RLEQDIARLEERRRELEERLEELEEELAELEEELEE-------------------LEEEL-EELEEELEEAEEELEEAEA 358

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  646 EMDSFNNQLKcgnMDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDE 725
Cdd:COG1196    359 ELAEAEEALL---EAEAELAEAEEELEELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEE 435

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  726 AARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARALVNYRAL 786
Cdd:COG1196    436 EEEEEEEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLL 496

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 56.97 E-value: 3.67e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258 1155 YDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11901      8 FNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQVGWFPSNYV 53

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 56.58 E-value: 3.82e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11781      3 RALYPFKAQSAKELSLKKGDIIyirrQIDKN------WYEGEHNGRVGIFPASYVE 52

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 56.87 E-value: 3.91e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSNYVK 1201
Cdd:cd11894      2 VKALYDYEGQTDDELSFPEGAIIRILNKENQDddgFWEGEFNGRIGVFPSVLVE 55

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 56.56 E-value: 4.08e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11826      3 VALYDYTADKDDELSFQEGDIIYVTKKN--DDGWYEGVLNGVTGLFPGNYVE 52

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 56.60 E-value: 4.80e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11786      2 AKALYNYEGKEPGDLSFKKGDIILLRKRiDENWYHGECNGKQGFFPASYVQV 53

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 56.48 E-value: 5.65e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNK-DDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11830      3 KARYDFCARDMRELSLKEGDVVKIYNKkGQQGWWRGEINGRIGWFPSTYVE 53

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 56.20 E-value: 5.75e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 970
Cdd:cd11823      4 ALYSYTANREDELSLQPGDIIEVHEKQDDgWWLGELNGKKGIFPATYV 51

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 56.10 E-value: 6.28e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11929      5 ALCNYRGHNPGDLKFNKGDVILLRRQLDENWYLGEINGVSGIFPASSVEV 54

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 56.26 E-value: 6.35e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11816      3 VARFDFEGEQEDELSFSEGDVITLKEYVGEEWAKGELNGKIGIFPLNFV 51

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 56.16 E-value: 6.73e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11780      2 YRALYSYTPQNEDELELREGDIVYVMEKC--DDGWFVGTSErtGLFGTFPGNYVAR 55

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 56.21 E-value: 7.14e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDD--PDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11836      4 ALYAFEARNPDEISFQPGDIIQVDESQVaePGWLAGELKGKTGWFPANYV 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 55.89 E-value: 7.24e-10

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVM-NKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11843      2 VRALYDYEGQESDELSFKAGDILTKLeEEDEQGWCKGRLDGRVGLYPANYV 52

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 55.57 E-value: 9.68e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11818      4 ALYDFTGENEDELSFKAGDIITELESIDEEWMSGELRGKSGIFPKNF 50

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 55.78 E-value: 9.75e-10

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                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIqVDEKTVGEpGWLYGSFQ--GKFGWFPCNYVEKM 837
Cdd:cd11933      4 FRAMYDYRAADDDEVSFKDGDTI-VNVQTIDE-GWMYGTVQrtGKTGMLPANYVEAI 58

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 55.29 E-value: 1.01e-09

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                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYG-SFQGKFGWFPC 831
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKS--EDGWWKGrNKGGKEGLIPS 47

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 55.76 E-value: 1.06e-09

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1149 CQVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGL-FPSNYVK 1201
Cdd:cd11970      4 CAVKALFDYKAQREDELTFTKNAIIQNVEKQEGGWWRGDYGGKKQLwFPSNYVE 57

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 55.78 E-value: 1.07e-09

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                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYVEKMLS 839
Cdd:cd12060      5 KARFNFKQTNEDELSVCKGDIIYVTR--VEEGGWWEGTLNGKTGWFPSNYVREIKS 58

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 55.59 E-value: 1.10e-09

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMN-KDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11948      1 EAVALYSFQATESDELPFQKGDILKILNmEDDQNWYKAELQGREGYIPKNYIKV 54

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 55.77 E-value: 1.13e-09

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                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDII----QVDEktvgepGWLYGSFQ--GKFGWFPCNYVEKM 837
Cdd:cd11934      5 YRAVYDYNAADEDEVSFQDGDTIvnvqQIDD------GWMYGTVErtGDTGMLPANYVEAI 59

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 55.42 E-value: 1.14e-09

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                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1150 QVIAmyDYIANNEDELNFSKGQLINVMNKDDPDWWQGEING-----VTGLFPSNYVKM 1202
Cdd:cd11839      3 QVIA--PFTATAENQLSLAVGQLVLVRKKSPSGWWEGELQArgkkrQIGWFPANYVKL 58

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 55.22 E-value: 1.19e-09

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11950      3 RALYDFEALEDDELGFNSGDVIEVLDSS--NPSWWKGRLHGKLGLFPANYVA 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 55.38 E-value: 1.25e-09

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12065      3 KAVYPCEAEHSSELSFEVGAIFE-DVTLSREPGWLEGTLNGKRGLIPENYVE 53

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 55.34 E-value: 1.35e-09

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11856      1 SYVAIADYEAQGDDEISLQEGEVVEVLEKNDSGWWYVRKGDKEGWVPASYLE 52

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 54.95 E-value: 1.43e-09

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gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11856      2 YVAIADYEAQGDDEISLQEGEVVEVLEK--NDSGWWYVRKGDKEGWVPASYLEP 53

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 55.08 E-value: 1.52e-09

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11828      2 AEALWDHVTMDPEELGFKAGDVIEVLDMSDKDWWWGSIRDEEGWFPASFVRL 53

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 54.91 E-value: 1.52e-09

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gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11986      2 FVALYRFKALEKDDLDFHPGERITVIDdSNEEWWRGKIGEKTGYFPMNFI 51

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 54.94 E-value: 1.55e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKtVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11830      4 ARYDFCARDMRELSLKEGDVVKIYNK-KGQQGWWRGEINGRIGWFPSTYVEE 54

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 55.20 E-value: 1.57e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11833      2 YVALYKFKPQENEDLEMRPGDKITLLDdSNEDWWKGKIEDRVGFFPANFV 51

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 55.03 E-value: 1.58e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGE-INGVTGLFPSNYV 1200
Cdd:cd11763      1 KVRALYDFDSQPSGELSLRAGEVLTITRQDVGDgWLEGRnSRGEVGLFPSSYV 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 55.12 E-value: 1.58e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQ--VDEKtvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11843      3 RALYDYEGQESDELSFKAGDILTklEEED---EQGWCKGRLDGRVGLYPANYVE 53

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 54.82 E-value: 1.72e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEWW------TGsigeRTGIFPSNYVRP 1055
Cdd:cd12009      2 VIAQYDFVPSNERDLQLKKGEKLQVLKSDGEWWlaksltTG----KEGYIPSNYVAR 54

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 55.01 E-value: 1.83e-09

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258 1155 YDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11902      7 FAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNGQIGWFPSNYV 52

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 54.65 E-value: 1.92e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11781      3 RALYPFKAQSAKELSLKKGDIIYIRRQIDKNWYEGEHNGRVGIFPASYVEI 53

RhoGEF, Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases [Signal transduction mechanisms];

Pssm-ID: 227709 [Multi-domain] Cd Length: 1175 Bit Score: 62.60 E-value: 1.93e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1226 ERKRQGYIHELIETEERYMDDLQLVIEVFQKRMAESGFLTE-AEMALI---FVNWKELIMSNTKLLKALRVRKKTggeKM 1301
Cdd:COG5422    482 EIKRQEAIYEVIYTERDFVKDLEYLRDTWIKPLEESNIIPEnARRNFIkhvFANINEIYAVNSKLLKALTNRQCL---SP 558

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1302 PVEMMGDILAAELSHMQAYIRFCSCQLNGAALLQQKTDEDADFKEF--LKKLASDPRCKGmpLSSFLLKPMQRITRYPLL 1379
Cdd:COG5422    559 IVNGIADIFLDYVPKFEPFIKYGASQPYAKYEFEREKSVNPNFARFdhEVERLDESRKLE--LDGYLTKPTTRLARYPLL 636

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1380 IRSILENTPQNHVDHSSLKLALERAEELCSQVNEGVREKENsdRLEWIQahvqcegLAEQLIFNSLTNCLG----PRKLL 1455
Cdd:COG5422    637 LEEVLKFTDPDNPDTEDIPKVIDMLREFLSRLNFESGKAEN--RGDLFH-------LNQQLLFKPEYVNLGlndeYRKII 707

                          250       260       270
                   ....*....|....*....|....*....|..
gi 1958785258 1456 YSGKLYKTKSNK-------ELHGFLFNDFLLL 1480
Cdd:COG5422    708 FKGVLKRKAKSKtdgslrgDIQFFLLDNMLLF 739

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 54.83 E-value: 2.00e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGE------WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11876      2 WTALFDYDARGEDELTLRRGQPVEVLSKDAAvsgdegWWTGKIGDKVGIFPSNYVAP 58

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 54.56 E-value: 2.22e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11805      1 RVQALYDFNPQEPGELEFRRGDIITVLDSsDPDWWKGELRGRVGIFPANYVQ 52

Second Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212945 Cd Length: 62 Bit Score: 54.99 E-value: 2.32e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDY--------IANNEDELNFSKGQLINVMNKDDPD-WWQGEINGVTGLFPSNYVK 1201
Cdd:cd12012      3 VALFDYdpltmspnPDAAEEELPFKEGQLIKVYGDKDADgFYLGEINGRRGLVPCNMVS 61

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 54.42 E-value: 2.76e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE-INGVTGLFPSNYVKM 1202
Cdd:cd11962      3 VVLYDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGTnSKGESGLFPSNYVEL 54

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 54.33 E-value: 2.77e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG-EINGVTGLFPSNYVKM 1202
Cdd:cd11960      2 ARALYDYQAADDTEISFDPGDIITDIEQIDEGWWRGtGPDGTYGLFPANYVEL 54

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 54.56 E-value: 3.05e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd12058      2 WTALYDYEASGEDELSLRRGDVVEVlsqDAAVSGDDGWWAGKIRHRLGIFPANYV 56

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 54.27 E-value: 3.14e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTG----SIGER-TGIFPSNYVRP 1055
Cdd:cd11887      5 KALYPYESDHEDDLNFDVGQLITVTEEeDADWYFGeyvdSNGNTkEGIFPKNFVEV 60

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 53.88 E-value: 4.02e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqaRGKKRQKGWFPASHV 1131
Cdd:cd11793      2 VQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGE---RLRDGERGWFPSSYT 53

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 53.79 E-value: 4.28e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11805      3 QALYDFNPQEPGELEFRRGDIITVLDSS--DPDWWKGELRGRVGIFPANYVQP 53

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 53.82 E-value: 4.34e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGG-----RGWFPKSY 969
Cdd:cd11883      3 VALYDFTPKSKNQLSFKAGDIIYVLNKDPSgWWDGVIISSsgkvkRGWFPSNY 55

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 53.80 E-value: 4.68e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11927      5 ALYNYEGKEPGDLKFSKGDIIILRRQVDENWYHGEVNGIHGFFPTNFVQI 54

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 53.52 E-value: 4.78e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvgEPGWLYGSFQ-GKFGWFPCNYV 834
Cdd:cd11837      2 ATALYPWRAKKENHLSFAKGDIITVLEQ---QEMWWFGELEgGEEGWFPKSYV 51

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 53.88 E-value: 5.05e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd12007      4 VALYDYEARTTEDLSFKKGERFQIINNTEGDWWEARsiATGKNGYIPSNYV 54

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 53.75 E-value: 5.11e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12057      3 KVLFPYEAQNEDELTIKEGDIVTLISKDCIDAGWWEGELNGRRGVFPDNFVK 54

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 53.58 E-value: 5.61e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT-------GLFPSNY 1199
Cdd:cd11773      4 ALYDYEPQTEDELTIQEDDILYLLEKSDDDWWKVKLKVNSsdddepvGLVPATY 57

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 60.91 E-value: 5.85e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  481 SCAAKQELERQRRLEWERIRRQEllNQKNREQEEIVRLNSKKKSLHLELE---AVNGKHQQIS-GRLQDV-RIRKQTQKT 555
Cdd:pfam17380  283 AVSERQQQEKFEKMEQERLRQEK--EEKAREVERRRKLEEAEKARQAEMDrqaAIYAEQERMAmERERELeRIRQEERKR 360

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  556 ELEVLDKQcdlEI-MEIKQLqqelqeyqNKLIYLVPEKQLLNERIKNMqlsntpdsgISLLHKKSSEKEELCQRLKEQLD 634
Cdd:pfam17380  361 ELERIRQE---EIaMEISRM--------RELERLQMERQQKNERVRQE---------LEAARKVKILEEERQRKIQQQKV 420

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  635 ALEKETASKLSEmdsfnNQLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELResyntQQLALEQLHKIKRDKLKElERKRL 714
Cdd:pfam17380  421 EMEQIRAEQEEA-----RQREVRRLEEERAREMERVRLEEQERQQQVERLR-----QQEEERKRKKLELEKEKR-DRKRA 489

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  715 EQIQKKKLEDE-AARKAKQGKENLWKESIRKEEEEKQKRLQEEKsQDRTQEEERKTEAKQSETAR 778
Cdd:pfam17380  490 EEQRRKILEKElEERKQAMIEEERKRKLLEKEMEERQKAIYEEE-RRREAEEERRKQQEMEERRR 553

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 53.48 E-value: 7.29e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11977      5 ARYNFAARDMRELSLREGDVVRIYSRIGGDQGWWKGETNGRIGWFPSTYVEE 56

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 60.84 E-value: 7.86e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  483 AAKQELERQRR-LEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLD 561
Cdd:TIGR02168  236 ELREELEELQEeLKEAEEELEELTAELQELEEKLEELRLEVSELEEEIEELQKELYALANEISRLEQQKQILRERLANLE 315

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  562 KQcdleimeikqlqqelqeyqnkliylvpeKQLLNERIKNMQlsntpdsgisllhKKSSEKEELCQRLKEQLDALEKETA 641
Cdd:TIGR02168  316 RQ----------------------------LEELEAQLEELE-------------SKLDELAEELAELEEKLEELKEELE 354

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  642 SKLSEMDSFNNQLKcgNMDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIK--RDKLKELERKRLEQIQK 719
Cdd:TIGR02168  355 SLEAELEELEAELE--ELESRLEELEEQLETLRSKVAQLELQIASLNNEIERLEARLERLEdrRERLQQEIEELLKKLEE 432

                          250       260       270       280       290
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  720 KKLEDEAARKA--KQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSE 775
Cdd:TIGR02168  433 AELKELQAELEelEEELEELQEELERLEEALEELREELEEAEQALDAAERELAQLQAR 490

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 52.90 E-value: 9.37e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11876      4 ALFDYDARGEDELTLRRGQPVEVlskDAAVSGDEGWWTGKIGDKVGIFPSNYV 56

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 52.75 E-value: 9.41e-09

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11786      4 ALYNYEGKEPGDLSFKKGDIILLRKRiDENWYHGECNGKQGFFPASYV 51

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 52.66 E-value: 9.68e-09

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG-EINGVTGLFPSNYVK 1201
Cdd:cd11768      1 IVVALYDFQPIEPGDLPLEKGEEYVVLDDSNEHWWRArDKNGNEGYIPSNYVT 53

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 52.73 E-value: 1.07e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELqaRGKkrqKGWFPASHV 1131
Cdd:cd11823      7 SYTANREDELSLQPGDIIEVHEKQDDGWWLGEL--NGK---KGIFPATYV 51

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 52.64 E-value: 1.10e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGEINGVTGLFPSNYVK 1201
Cdd:cd11976      4 ARYDFCARDRSELSLKEGDIIKILNKKGQQgWWRGEIYGRVGWFPANYVE 53

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 52.74 E-value: 1.10e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11796      1 QARVLQDLSAQLDEELDLREGDVVTITGILDKGWFRGELNGRRGIFPEGFV 51

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 52.53 E-value: 1.13e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11949      2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDpNWWKGACHGQTGMFPRNYVT 52

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 52.73 E-value: 1.15e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYV 1053
Cdd:cd11823      4 ALYSYTANREDELSLQPGDIIEVHEKQDDgWWLGELNGKKGIFPATYV 51

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 52.42 E-value: 1.25e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11840      4 ALFPYTAQNEDELSFQKGDIINVLSKDDpDWWRGELNGQTGLFPSNYVE 52

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 52.66 E-value: 1.27e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1153 AMYDYI-ANNEDELNFSKGQLINVMNKDDP-----DWWQGEI-NGVTGLFPSNYV 1200
Cdd:cd11771      4 ALYDFTpENPEMELSLKKGDIVAVLSKTDPlgrdsEWWKGRTrDGRIGWFPSNYV 58

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 52.42 E-value: 1.30e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYV 1053
Cdd:cd11827      4 ALYAYDAQDTDELSFNEGDIIEILKEDPSgWWTGRLRGKEGLFPGNYV 51

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 60.15 E-value: 1.39e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  350 KTQEEEPQKKLPvtfEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQ---KEKEEWERKQRELQE--QEWKKQLELE 424
Cdd:PTZ00121  1321 KKKAEEAKKKAD---AAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEaaeKKKEEAKKKADAAKKkaEEKKKADEAK 1397

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  425 KRLEKQRELERQREEERRKEIERRESCISFPLMREREWISVYKDRKGFMAELWKPGSCAAKQELERQRRlewERIRRQEL 504
Cdd:PTZ00121  1398 KKAEEDKKKADELKKAAAAKKKADEAKKKAEEKKKADEAKKKAEEAKKADEAKKKAEEAKKAEEAKKKA---EEAKKADE 1474

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  505 LNQKNREQEEIVRLN-----SKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTElevlDKQCDLEIMEIKQLQQELQ 579
Cdd:PTZ00121  1475 AKKKAEEAKKADEAKkkaeeAKKKADEAKKAAEAKKKADEAKKAEEAKKADEAKKAE----EAKKADEAKKAEEKKKADE 1550

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  580 EYQNKLIYLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKcgnM 659
Cdd:PTZ00121  1551 LKKAEELKKAEEKKKAEEAKKAEEDKNMALRKAEEAKKAEEARIEEVMKLYEEEKKMKAEEAKKAEEAKIKAEELK---K 1627

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  660 DDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKEnlwK 739
Cdd:PTZ00121  1628 AEEEKKKVEQLKKKEAEEKKKAEELKKAEEENKIKAAEEAKKAEEDKKKAEEAKKAEEDEKKAAEALKKEAEEAKK---A 1704

                          410       420       430
                   ....*....|....*....|....*....|....*.
gi 1958785258  740 ESIRKEEEEKQKRLQEEksqdRTQEEERKTEAKQSE 775
Cdd:PTZ00121  1705 EELKKKEAEEKKKAEEL----KKAEEENKIKAEEAK 1736

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 52.66 E-value: 1.42e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHD-EMSFNSGDIIQVDEKT--VGEP-GWLYGSFQ-GKFGWFPCNYVE 835
Cdd:cd11771      3 RALYDFTPENPEmELSLKKGDIVAVLSKTdpLGRDsEWWKGRTRdGRIGWFPSNYVE 59

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 52.32 E-value: 1.45e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11877      4 AKFNFEGTNEDELSFDKGDIITVTQVvEGGWWEGTLNGKTGWFPSNYVKE 53

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 52.10 E-value: 1.46e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNY 1052
Cdd:cd11817      3 VALYDFTGETEEDLSFQRGDRILVTEHlDAEWSRGRLNGREGIFPRAF 50

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 52.34 E-value: 1.49e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12076      3 YTVIYPYTARDQDEINLEKGAVVEVIQKNL--EGWWKIRYQGKEGWAPASYLKK 54

Src homology 3 domain of Slit-Robo GTPase Activating Proteins 1, 2, and 3; srGAP1, also called Rho GTPase-Activating Protein 13 (ARHGAP13), is a Cdc42- and RhoA-specific GAP and is expressed later in the development of central nervous system tissues. srGAP2 is expressed in zones of neuronal differentiation. It plays a role in the regeneration of neurons and axons. srGAP3, also called MEGAP (MEntal disorder associated GTPase-Activating Protein), is a Rho GAP with activity towards Rac1 and Cdc42. It impacts cell migration by regulating actin and microtubule cytoskeletal dynamics. The association between srGAP3 haploinsufficiency and mental retardation is under debate. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212888 [Multi-domain] Cd Length: 53 Bit Score: 52.25 E-value: 1.51e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11955      1 EAIAKFDYVGRSARELSFKKGASLLLYHRASDDWWEGRHNGIDGLVPHQYI 51

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 52.32 E-value: 1.52e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEktvgepGWLYGSF-QGKFGWFPCNYVE 835
Cdd:cd11819      3 KALYDYQAAEDNEISFVEGDIItqieQIDE------GWWLGVNaKGQKGLFPANYVE 53

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 52.47 E-value: 1.55e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKNS--SGWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd12142      3 RVLFDYNPVAPDELALKKGDVIEVISKETedEGWWEGELNGR-----RGFFPDNFV 53

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 52.20 E-value: 1.60e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWW------TGsigeRTGIFPSNY 1052
Cdd:cd11845      2 YVALYDYEARTDDDLSFKKGDRLQILDDsDGDWWlarhlsTG----KEGYIPSNY 52

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 52.30 E-value: 1.64e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGS--IGERTGIFPSNYV 1053
Cdd:cd12004      3 VALYPYDGIHEDDLSFKKGEKLKVIEEHGEWWKARslTTKKEGFIPSNYV 52

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 51.93 E-value: 1.75e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLI-NVMNKDDpDWWQG--EINGVTGLFPSNYVKM 1202
Cdd:cd11789      1 RYRAMYDYAAADDDEVSFQEGDVIiNVEIIDD-GWMEGtvQRTGQSGMLPANYVEL 55

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 52.27 E-value: 1.75e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEING---VTGLFPSNYV 1200
Cdd:cd11966      1 RVKALYNCVADNPDELTFSEGEIIIVDGEEDKEWWIGHIDGeptRRGAFPVSFV 54

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 52.32 E-value: 1.78e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11920      5 AVYDFKAQTSKELSFKKGDTVYILRKIDQNWYEGEHHGRVGIFPISYVE 53

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 51.87 E-value: 1.84e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYVR 1054
Cdd:cd11985      2 YVALYKFLPQENNDLPLQPGDRVMVVDDSNEdWWKGKSGDRVGFFPANFVQ 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 52.14 E-value: 1.89e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11950      4 ALYDFEALEDDELGFNSGDVIEVlDSSNPSWWKGRLHGKLGLFPANYVAP 53

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 52.00 E-value: 1.89e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11807      2 VVYALFDYEAENGDELSFREGDELTVLRKGDDDeteWWWARLNDKEGYVPRNLLGL 57

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 52.15 E-value: 1.99e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLI-NVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12053      1 EYIVEYDYDAVHEDELTIRVGEIIrNVKKLEEEGWLEGELNGRRGMFPDNFVK 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 51.99 E-value: 2.10e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDD----PDWWQGEINGVTGLFPSNY 1199
Cdd:cd11800      1 YYYALYTFEARSPGELSVTEGQVVTVLEKHDlkgnPEWWLVEDRGKQGYVPSNY 54

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 51.95 E-value: 2.14e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGEINGVTGLFPSNYVK 1201
Cdd:cd11978      4 IARYDFCARDMRELSLLKGDVVKIYTKMSTNgWWRGEVNGRVGWFPSTYVE 54

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 52.02 E-value: 2.16e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEktvgepGWLYGSFQ-GKFGWFPCNYVE 835
Cdd:cd11960      3 RALYDYQAADDTEISFDPGDIItdieQIDE------GWWRGTGPdGTYGLFPANYVE 53

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 51.73 E-value: 2.19e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11813      1 RAKALLDFERHDDDELGFRKNDIITIISQKdEHCWVGELNGLRGWFPAKFVEL 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 51.87 E-value: 2.20e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 970
Cdd:cd11964      2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDpNWWKGETPQGTGLFPSNFV 52

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 51.80 E-value: 2.29e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1146 HAVcqviAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11815      1 HAV----VLHDFPAEHSDDLSLNSGEIVYLLEKIDTEWYRGKCKNTTGIFPANHVK 52

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 51.69 E-value: 2.42e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGE------WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd12059      2 WTAVFDYEASAEDELTLRRGDRVEVLSKDSAvsgdegWWTGKINDRVGIFPSNYVTS 58

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 51.74 E-value: 2.49e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12047      1 RMVAQHDYSAQGPEDLEFSQGDTIDILSEVNQEWLEGHCDGRIGIFPKCFA 51

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 59.00 E-value: 2.57e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  347 SYQKTQEEEPQKKLpvtfEDKRKANYERGNMELEKRRQVLMEQQQrEAERKAQ--KEKEEWERKQRELQE--QEWKKQLE 422
Cdd:PTZ00121  1374 EEAKKKADAAKKKA----EEKKKADEAKKKAEEDKKKADELKKAA-AAKKKADeaKKKAEEKKKADEAKKkaEEAKKADE 1448

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  423 LEKRLEKQRELERQREEERRKEIERRescisfpLMREREwisvyKDRKgfmAELWKPGSCAAKQELERQRRLEWERIRRQ 502
Cdd:PTZ00121  1449 AKKKAEEAKKAEEAKKKAEEAKKADE-------AKKKAE-----EAKK---ADEAKKKAEEAKKKADEAKKAAEAKKKAD 1513

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  503 ELLN-QKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISgrlQDVRIRKQTQKTELEVLDKQCDLEIMEIKQLQQELQEY 581
Cdd:PTZ00121  1514 EAKKaEEAKKADEAKKAEEAKKADEAKKAEEKKKADELK---KAEELKKAEEKKKAEEAKKAEEDKNMALRKAEEAKKAE 1590

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  582 QNKliylVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDD 661
Cdd:PTZ00121  1591 EAR----IEEVMKLYEEEKKMKAEEAKKAEEAKIKAEELKKAEEEKKKVEQLKKKEAEEKKKAEELKKAEEENKIKAAEE 1666

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  662 SVLQCLLSLLSclnnlflllKELRESYNTQQLALEQLHKikrdklKELERKRLEQIQKKKLED----EAARKAKQGKENL 737
Cdd:PTZ00121  1667 AKKAEEDKKKA---------EEAKKAEEDEKKAAEALKK------EAEEAKKAEELKKKEAEEkkkaEELKKAEEENKIK 1731

                          410       420       430       440
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258  738 WKESIRKEEEEKQK----RLQEE---KSQDRTQEEERKTEAKQSE 775
Cdd:PTZ00121  1732 AEEAKKEAEEDKKKaeeaKKDEEekkKIAHLKKEEEKKAEEIRKE 1776

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 51.34 E-value: 2.86e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd12046      3 VALFSYEASQPEDLEFQKGDVILVLSKvNEDWLEGQCKGKIGIFPSAFVED 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 51.27 E-value: 3.26e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11842      3 VALYDFAGEQPGDLAFQKGDIITILKKSDSQNDWWTGRIGGREGIFPANYVE 54

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 51.33 E-value: 3.31e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDpDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11947      4 GKFDFTASGEDELSFKKGDVLKILSSDD-IWFKAELNGEEGYVPKNFV 50

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 58.41 E-value: 3.33e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  364 FEDKRKANYERGN--MELEKRRQVLMEQQQREAERKAQ--KEKEEWERKQRELQEQ--EWKKQL-ELEKRLEKQRELERQ 436
Cdd:COG1196    283 LEEAQAEEYELLAelARLEQDIARLEERRRELEERLEEleEELAELEEELEELEEEleELEEELeEAEEELEEAEAELAE 362

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  437 REEERRKEIERREScisfplmREREWISVYKDRKGFMAELWKpgscAAKQELERQRRLEWERIRRQELLNQKNREQEEIV 516
Cdd:COG1196    363 AEEALLEAEAELAE-------AEEELEELAEELLEALRAAAE----LAAQLEELEEAEEALLERLERLEEELEELEEALA 431

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  517 RLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQcdleIMEIKQLQQELQEYQNKLIYLVPEKQLLN 596
Cdd:COG1196    432 ELEEEEEEEEEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAA----LAELLEELAEAAARLLLLLEAEADYEGFL 507

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  597 ERIKNMQLSNTPDSGISLLH--------------------------KKSSEKEELCQRLKEQLDA------LEKETASKL 644
Cdd:COG1196    508 EGVKAALLLAGLRGLAGAVAvligveaayeaaleaalaaalqnivvEDDEVAAAAIEYLKAAKAGratflpLDKIRARAA 587

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  645 SEMDSFNNQLKCGNMDDSVLQCLLSLLSCLNNLFLL---------------LKELRESYNTQQLALEQLHKIKRDKLKEL 709
Cdd:COG1196    588 LAAALARGAIGAAVDLVASDLREADARYYVLGDTLLgrtlvaarleaalrrAVTLAGRLREVTLEGEGGSAGGSLTGGSR 667

                          410       420       430       440       450       460       470       480
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  710 ERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARALVNYRALYPF 789
Cdd:COG1196    668 RELLAALLEAEAELEELAERLAEEELELEEALLAEEEEERELAEAEEERLEEELEEEALEEQLEAEREELLEELLEEEEL 747


                   ..
gi 1958785258  790 EA 791
Cdd:COG1196    748 LE 749

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 51.55 E-value: 3.34e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVdekTVGEP--GWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11779      4 KALYPHAAGGETQLSFEEGDVITL---LGPEPrdGWHYGENErsGRRGWFPIAYTEP 57

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 51.21 E-value: 3.60e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11786      3 KALYNYEGKEPGDLSFKKGDIIllrkRIDEN------WYHGECNGKQGFFPASYVQ 52

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 51.26 E-value: 3.60e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  785 ALYPFEARNHDEMSFNSGDII----QVDEktvgepGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11959      4 ALYDYQAADDDEISFDPDDIItnieMIDE------GWWRGVCRGKYGLFPANYVE 52

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 51.17 E-value: 3.65e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNK---DDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11884      2 VVAVRAYITRDQTLLSFHKGDVIKLLPKegpLDPGWLFGTLDGRSGAFPKEYV 54

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 51.31 E-value: 3.76e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd12059      4 AVFDYEASAEDELTLRRGDRVEVlskDSAVSGDEGWWTGKINDRVGIFPSNYV 56

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 51.31 E-value: 3.83e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11820      2 KVRALYDFEAAEDNELTFKAGEIITVLDDSdPNWWKGSNHRGEGLFPANFVTA 54

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 51.27 E-value: 3.98e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1153 AMYDYIANNED--ELNFSKGQLINVmnKDDP-DWWQGEI-NGVTGLFPSNYVKM 1202
Cdd:cd11855      4 ALYPYDASPDDpnELSFEKGEILEV--SDTSgKWWQARKsNGETGICPSNYLQL 55

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 51.09 E-value: 3.99e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKD----DPDWWQGEINGVT-GLFPSNYVK 1201
Cdd:cd11864      3 RAEYDFVAESEDELSFRAGDKLRLAPKElqprVRGWLLATVDGQKiGLVPANYVK 57

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 51.17 E-value: 4.08e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11963      6 ALYDFEAVEDNELTFKHGEIIIVlDDSDANWWKGENHRGVGLFPSNFV 53

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 51.06 E-value: 4.18e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKD-GEWWTGSIGERTGIFPSNYVRP 1055
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDnDGWWEGETGGRVGLVPSTAVEE 53

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 51.17 E-value: 4.23e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGE--VHGGRGWFPKSYVK 971
Cdd:cd11779      2 RVKALYPHAAGGETQLSFEEGDVITLLgpEPRDGWHYGEneRSGRRGWFPIAYTE 56

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 51.15 E-value: 4.38e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  780 LVNYRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVE 835
Cdd:cd11916      1 AYSYQALYSYAPQNDDELELRDGDIVDVMEKC--DDGWFVGTSRrtKQFGTFPGNYVK 56

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 51.13 E-value: 4.40e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDG-EWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11996      2 QVIAMYDYTANNEDELSFSKGQLINVLNKDDpDWWQGEINGVTGLFPSNYVK 53

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 50.76 E-value: 4.49e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG--EINGVTGLFPSNYVK 1201
Cdd:cd11780      4 ALYSYTPQNEDELELREGDIVYVMEKCDDGWFVGtsERTGLFGTFPGNYVA 54

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 50.86 E-value: 4.56e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVG--EPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11762      3 RALYDYEAQSDEELSFPEGAIIRILRKDDNgvDDGWWEGEFNGRVGVFPSLVVE 56

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 51.17 E-value: 4.59e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQV---DEKTVGEPGWLYGSFQ--GKFGWFPCNYVEKM 837
Cdd:cd11790      6 RATHDYTAEDTDELTFEKGDVILVipfDDPEEQDEGWLMGVKEstGCRGVFPENFTERI 64

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 50.72 E-value: 4.71e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11803      5 ALYDFEPENEGELGFKEGDIItLTNQIDENWYEGMVNGQSGFFPVNYV 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 50.79 E-value: 5.01e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTG--SIGERtGIFPSNYVRP 1055
Cdd:cd11763      4 ALYDFDSQPSGELSLRAGEVLTITRQDVGdgWLEGrnSRGEV-GLFPSSYVEI 55

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 50.71 E-value: 5.87e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11856      1 SYVAIADYEAQGDDEISLQEGEVVEVLEKnDSGWWYVRKGDKEGWVPASYLEP 53

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 50.84 E-value: 5.89e-08

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVT-QKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12061      4 AKFNFQQTNEDELSFSKGDVIHVTrVEEGGWWEGTHNGRTGWFPSNYVR 52

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 50.43 E-value: 5.92e-08

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11782      1 EARAKYNFNADTGVELSFRKGDVITLTRRVDENWYEGRIGGRQGIFPVSYVQ 52

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 50.54 E-value: 6.19e-08

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11820      4 RALYDFEAAEDNELTFKAGEIITVLDDS--DPNWWKGSNHRGEGLFPANFVTA 54

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 50.54 E-value: 6.36e-08

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT-GLFPSNYV 1200
Cdd:cd11774      1 QAKALYDYDKQTEEELSFNEGDTLDVYDDSDSDWILVGFNGTQfGFVPANYI 52

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 50.39 E-value: 6.38e-08

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVT-QKDGEWWTGSI---GERTGIFPSNY 1052
Cdd:cd11821      4 ALYDCQADNDDELTFSEGEIIVVTgEEDDEWWEGHIegdPSRRGVFPVSF 53

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 50.79 E-value: 6.54e-08

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                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPD-----WWQG--EINGVTGLFPSNYVK 1201
Cdd:cd11790      5 VRATHDYTAEDTDELTFEKGDVILVIPFDDPEeqdegWLMGvkESTGCRGVFPENFTE 62

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 50.53 E-value: 7.14e-08

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12016      3 YITTQAYKAENEDEIGFETGVVVEVIQKNL--DGWWKIRYQGKEGWAPATYLKK 54

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 50.44 E-value: 7.25e-08

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNK--DDPDWWQGE-INGVTGLFPSNYV 1200
Cdd:cd11903      3 VQTLYPFSSVTEEELNFEKGETMEVIEKpeNDPEWWKCKnSRGQVGLVPKNYV 55

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 50.41 E-value: 7.74e-08

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVE 835
Cdd:cd11793      4 CVHAYTAQQPDELTLEEGDVVNVLRKM--PDGWYEGErlRDGERGWFPSSYTE 54

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 50.36 E-value: 7.77e-08

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11996      5 AMYDYTANNEDELSFSKGQLINVLNKDDpDWWQGEINGVTGLFPSNYVKM 54

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 50.20 E-value: 7.95e-08

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                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGE-VHGGRGWFPKSYV 970
Cdd:cd11812      4 ALYDYTANRSDELTIHRGDIIRVLYKdNDNWWFGSlVNGQQGYFPANYV 52

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 50.34 E-value: 8.16e-08

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKII 973
Cdd:cd11803      3 CRALYDFEPENEGELGFKEGDIITLTNQiDENWYEGMVNGQSGFFPVNYVEVL 55

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 50.22 E-value: 8.16e-08

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gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11961      4 ALYDYDAAEDNELSFFENDKIInIEFVDDDWWLGECHGSRGLFPSNYV 51

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 50.05 E-value: 8.71e-08

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE-INGVTGLFPSNYV 1200
Cdd:cd11758      3 VRALFDFPGNDDEDLPFKKGEILTVIRKPEEQWWNARnSEGKTGMIPVPYV 53

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 50.01 E-value: 8.72e-08

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWW-TGSIGERTGIFPSNYVR 1054
Cdd:cd11849      2 YRALYDFKSAEPNTLSFSEGETFLLLERsNAHWWlVTNHSGETGYVPANYVK 53

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 50.02 E-value: 8.84e-08

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYG-SFQGKFGWFPCNYVE 835
Cdd:cd11763      2 VRALYDFDSQPSGELSLRAGEVLTITRQDVGD-GWLEGrNSRGEVGLFPSSYVE 54

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 50.31 E-value: 8.93e-08

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11928      5 ALYSYEGKEPGDLKFNKGDIIILRRKVDENWYHGELNGCHGFLPASYIQC 54

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 50.02 E-value: 9.02e-08

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKF-GWFPCNYVEK 836
Cdd:cd11825      3 KALYDYRAQRPDELSFCKHAIITNVEKEDG--GWWRGDYGGKKqKWFPANYVEE 54

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 50.01 E-value: 9.19e-08

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                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGV---TGLFPSNYVKM 1202
Cdd:cd11965      1 RVKTIYDCQADNDDELTFVEGEVIIVTGEEDQEWWIGHIEGQperKGVFPVSFVHI 56

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 49.97 E-value: 9.42e-08

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd12054      4 KVLFEYVPQNEDELELKVGDIIDINEEV--EEGWWSGTLNGKSGLFPSNFVKEL 55

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 49.80 E-value: 9.52e-08

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11813      4 ALLDFERHDDDELGFRKNDIITIISQKDEHCWVGELNGLRGWFPAKFVEL 53

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 49.96 E-value: 1.04e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYV 834
Cdd:cd11918      4 YKAVYQYRPQNEDELELREGDRVDVMQQC--DDGWFVGVSRrtQKFGTFPGNYV 55

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 50.03 E-value: 1.08e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd11793      1 QVQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGErlRDGERGWFPSSYT 53

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 49.70 E-value: 1.10e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHV 1131
Cdd:cd11806      8 FVATDDSQLSFESGDKLLVLRKPSVDWWWAEHNG-----CCGYIPASHL 51

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 49.99 E-value: 1.10e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVKM 1202
Cdd:cd11916      6 ALYSYAPQNDDELELRDGDIVDVMEKCDDGWFVGTSRRTKqfGTFPGNYVKL 57

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 49.94 E-value: 1.11e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11929      2 RAKALCNYRGHNPGDLKFNKGDVILLRRQlDENWYLGEINGVSGIFPASSVEV 54

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 49.81 E-value: 1.11e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMnKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd12009      2 VIAQYDFVPSNERDLQLKKGEKLQVL-KSDGEWWLAKslTTGKEGYIPSNYV 52

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 49.83 E-value: 1.23e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11870      1 QVVALHRYEAQGPEDLGFREGDTIDVLSEVNEAWLEGHSDGRVGIFPKCFVV 52

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 49.84 E-value: 1.24e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11949      4 ALFDFDPQEDGELGFRRGDFIeVMDNSDPNWWKGACHGQTGMFPRNYVTP 53

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 49.40 E-value: 1.25e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNY 833
Cdd:cd11818      3 RALYDFTGENEDELSFKAGDIIteleSIDEE------WMSGELRGKSGIFPKNF 50

Src homology 3 domain of Alpha Spectrin; Spectrin is a major structural component of the red blood cell membrane skeleton and is important in erythropoiesis and membrane biogenesis. It is a flexible, rope-like molecule composed of two subunits, alpha and beta, which consist of many spectrin-type repeats. Alpha and beta spectrin associate to form heterodimers and tetramers; spectrin tetramer formation is critical for red cell shape and deformability. Defects in alpha spectrin have been associated with inherited hemolytic anemias including hereditary spherocytosis (HSp), hereditary elliptocytosis (HE), and hereditary pyropoikilocytosis (HPP). Alpha spectrin contains a middle SH3 domain and a C-terminal EF-hand binding motif in addition to multiple spectrin repeats. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212742 [Multi-domain] Cd Length: 53 Bit Score: 49.79 E-value: 1.30e-07

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11808      2 VVALYDYQEKSPREVSMKKGDILTLLNSSNKDWWKVEVNDRQGFVPAAYVK 52

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 49.80 E-value: 1.33e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11869      4 ALFDFTGNSKLELNFKAGDVIFLLSRVNKDWLEGTVRGATGIFPLSFVKI 53

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 49.54 E-value: 1.36e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11928      4 KALYSYEGKEPGDLKFNKGDIIILRRKvDENWYHGELNGCHGFLPASYIQ 53

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 49.64 E-value: 1.36e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11978      5 ARYDFCARDMRELSLLKGDVVKIYTKM-STNGWWRGEVNGRVGWFPSTYVEE 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 49.57 E-value: 1.50e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKG-QLINVMNKDDPDWWQGEI-NGVTGLFPSNYVK 1201
Cdd:cd11997      3 RVRALYDYTGQEADELSFKAGeELLKIGEEDEQGWCKGRLlSGRIGLYPANYVE 56

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 49.39 E-value: 1.59e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11820      5 ALYDFEAAEDNELTFKAGEIITVLDdSDPNWWKGSNHRGEGLFPANFV 52

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 49.19 E-value: 1.66e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11873      2 VIVEFDYDAEEPDELTLKVGDIITNVKKM--EEGWWEGTLNGKRGMFPDNFVKV 53

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 49.12 E-value: 1.71e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELqargKKRQKGWFPA 1128
Cdd:pfam00018    5 DYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRN----KGGKEGLIPS 47

Src Homology 3 domain of Membrane Protein, Palmitoylated (or MAGUK p55 subfamily member) proteins; The MPP/p55 subfamily of MAGUK (membrane-associated guanylate kinase) proteins includes at least eight vertebrate members (MPP1-7 and CASK), four Drosophila proteins (Stardust, Varicose, CASK and Skiff), and other similar proteins; they all contain one each of the core of three domains characteristic of MAGUK proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, most members except for MPP1 contain N-terminal L27 domains and some also contain a Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. CASK has an additional calmodulin-dependent kinase (CaMK)-like domain at the N-terminus. Members of this subfamily are scaffolding proteins that play important roles in regulating and establishing cell polarity, cell adhesion, and synaptic targeting and transmission, among others. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212796 Cd Length: 61 Bit Score: 49.50 E-value: 1.80e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1153 AMYDYIANNEDE-------LNFSKGQLINVMNKDDPDWWQ----GEINGVTGLFPS 1197
Cdd:cd11862      4 ALFDYDPEEDPLipckeagLSFKKGDILQIVNQDDPNWWQarkvGDPNGRAGLIPS 59

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 49.05 E-value: 1.84e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1081 SAYAASG---AEQLSLAPGQLILILKKNSSGWWQGElqargKKRQKGWFPASHV 1131
Cdd:cd11829      4 TLYAFTGeqhQQGLSFEAGELIRVLQAPDGGWWEGE-----KDGLRGWFPASYV 52

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 49.18 E-value: 1.89e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  781 VNYRALYPFEARNHDEMSFNSGD-IIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 835
Cdd:cd11998      1 VRVRALYDYDGQEQDELSFKAGDeLTKLEDED--EQGWCKGRLDsGQVGLYPANYVE 55

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 49.03 E-value: 1.92e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11951      4 AQYDFSAEDPSQLSFRRGDIIEVLDCpDPNWWRGRISGRVGFFPRNYVHP 53

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 48.95 E-value: 1.96e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  782 NYRALYPFEARNHDEMSFNSGDIIQVDEKTvGEpgWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11838      1 EYIALYPYESNEPGDLTFNAGDVILVTKKD-GE--WWTGTIGDRTGIFPSNYVRP 52

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 49.30 E-value: 2.11e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDG----EWWTGSIGERTGIFPSNY 1052
Cdd:cd11807      5 ALFDYEAENGDELSFREGDELTVLRKGDddetEWWWARLNDKEGYVPRNL 54

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 48.77 E-value: 2.23e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYVR 1054
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDgWWEGINTGRTGLVPANYVE 49

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 48.80 E-value: 2.27e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 970
Cdd:cd11766      1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDgWWRGECNGQVGWFPSNYV 51

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 48.88 E-value: 2.29e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11844      4 ALYDNVAESPDELAFRRGDILTVLEQNTAGlegWWLCSLRGRQGIAPGNRLKL 56

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 48.86 E-value: 2.43e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 970
Cdd:cd11963      3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDaNWWKGENHRGVGLFPSNFV 53

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 48.80 E-value: 2.45e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11873      1 EVIVEFDYDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 48.65 E-value: 2.49e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSI--GERTGIFPSNYV 1053
Cdd:cd11889      4 AVYSWAGETEGDLGFLEGDLIEVLSiGDGSWWSGKLrrNGAEGIFPSNFV 53

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 48.79 E-value: 2.50e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11927      5 ALYNYEGKEPGDLKFSKGDIIILrRQVDENWYHGEVNGIHGFFPTNFVQ 53

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 55.75 E-value: 2.53e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLPVTFEDKRKANYErgNMELEKRRQVLMEQqqreaERKAQKEKEEWERKQRELQEQEWKKQLELEKRle 428
Cdd:pfam02463  167 LKRKKKEALKKLIEETENLAELIID--LEELKLQELKLKEQ-----AKKALEYYQLKEKLELEEEYLLYLDYLKLNEE-- 237

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  429 kqrelerqreeerrkeierrescisfplmREREWISVYKDRkgfmaelwkpgscaaKQELERQRRLEWERIRRQELLNQK 508
Cdd:pfam02463  238 -----------------------------RIDLLQELLRDE---------------QEEIESSKQEIEKEEEKLAQVLKE 273

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  509 NREQEEIVRLNSKKKSLHLELEAVNGKhQQISGRLQDVRIRKQTQKTELEVLDKQcdleiMEIKQLQQELQEYQNKLIYL 588
Cdd:pfam02463  274 NKEEEKEKKLQEEELKLLAKEEEELKS-ELLKLERRKVDDEEKLKESEKEKKKAE-----KELKKEKEEIEELEKELKEL 347

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  589 VPEKQLLNERIKNMqlsntpdsgisllhkkSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDDSVLQcll 668
Cdd:pfam02463  348 EIKREAEEEEEEEL----------------EKLQEKLEQLEEELLAKKKLESERLSSAAKLKEEELELKSEEEKEAQ--- 408

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  669 sllsclnnlflLLKELREsynTQQLALEQLHKIKRDKLKELERKRL-----EQIQKKKLEDEAARKAKQGKENLWKESIR 743
Cdd:pfam02463  409 -----------LLLELAR---QLEDLLKEEKKEELEILEEEEESIElkqgkLTEEKEELEKQELKLLKDELELKKSEDLL 474

                          410       420
                   ....*....|....*....|....*.
gi 1958785258  744 KEEEEKQKRLQEEKSQDRTQEEERKT 769
Cdd:pfam02463  475 KETQLVKLQEQLELLLSRQKLEERSQ 500

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 48.88 E-value: 2.69e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTG-SIGE-RTGIFPSNYVRPKD 1057
Cdd:cd12007      3 FVALYDYEARTTEDLSFKKGERFqIINNTEGDWWEArSIATgKNGYIPSNYVAPAD 58

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 48.83 E-value: 2.74e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFG-WFPCNYVEKML 838
Cdd:cd11970      7 KALFDYKAQREDELTFTKNAIIQNVEKQEG--GWWRGDYGGKKQlWFPSNYVEEIS 60

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 48.65 E-value: 2.79e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11833      3 VALYKFKPQENEDLEMRPGDKITLLDDSNEDWWKGKIEDRVGFFPANFV 51

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 48.85 E-value: 2.80e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd11920      4 RAVYDFKAQTSKELSFKKGDTVYILRKI--DQNWYEGEHHGRVGIFPISYVEKL 55

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 48.75 E-value: 2.82e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11986      3 VALYRFKALEKDDLDFHPGERITVIDDSNEEWWRGKIGEKTGYFPMNFI 51

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 48.57 E-value: 3.02e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11842      1 KAVALYDFAGEQPGDLAFQKGDIITILKKsdsQNDWWTGRIGGREGIFPANYVEL 55

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 48.35 E-value: 3.25e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEV---HGGRGWFPKSYVKI 972
Cdd:cd11872      4 AIYNFQGDGEHQLSLQVGDTVQILEECEGWYRGFSlrnKSLKGIFPKSYVHI 55

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 48.28 E-value: 3.31e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd12047      3 VAQHDYSAQGPEDLEFSQGDTIdILSEVNQEWLEGHCDGRIGIFPKCFAVR 53

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 48.67 E-value: 3.42e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  785 ALYPFEARNHDEMSFNSGDII----QVDEktvgepGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12073      5 ALYDYQGEGDDEISFDPQETItdieMVDE------GWWKGTCHGHRGLFPANYVE 53

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 48.35 E-value: 3.43e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGR-GWFP 966
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSEdGWWKGRNKGGKeGLIP 46

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 48.40 E-value: 3.63e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqargKKRQKGWFPASHVK 1132
Cdd:cd11856      4 AIADYEAQGDDEISLQEGEVVEVLEKNDSGWWYVR-----KGDKEGWVPASYLE 52

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 48.52 E-value: 3.66e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11974      5 ALWDHVTMDDQELAFKAGDVIRVLEASNKDWWWGRNEDREAWFPASFVRL 54

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 48.42 E-value: 3.70e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHV 1131
Cdd:cd11766      1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNG-----QVGWFPSNYV 51

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 48.45 E-value: 3.73e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMN-KDDPDWWQGE-INGVTGLFPSNYVK 1201
Cdd:cd11769      3 ECIAKYNFNGASEEDLPFKKGDILTIVAvTKDPNWYKAKnKDGREGMIPANYVQ 56

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 48.57 E-value: 3.92e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd12008      3 VALYDYESRTETDLSFKKGERLQIVNNTEGDWWLAHslTTGQTGYIPSNYV 53

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 48.10 E-value: 3.97e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11874      3 KVLFSYTPQNEDELELKVGDTIEVLGEV--EEGWWEGKLNGKVGVFPSNFVK 52

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 48.00 E-value: 4.01e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDgWWEGINTGRTGLVPANYVE 49

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 48.39 E-value: 4.32e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE---WWTGSIGERTGIFPSNY 1052
Cdd:cd11952      5 ALWDYSAEFPDELSFKEGDMVTVLRKDGEgtdWWWASLCGREGYVPRNY 53

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 48.46 E-value: 4.36e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPSNYVKM 1202
Cdd:cd11935      5 AMYDYSAQDEDEVSFRDGDYIVNVQPIDEGWMYGTVqrTGRTGMLPANYIEF 56

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 47.99 E-value: 4.46e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11928      5 ALYSYEGKEPGDLKFNKGDIIILRRKvDENWYHGELNGCHGFLPASYIQ 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 48.02 E-value: 4.51e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKG-QLINVMNKDDPDWWQGEI-NGVTGLFPSNYVK 1201
Cdd:cd11998      2 RVRALYDYDGQEQDELSFKAGdELTKLEDEDEQGWCKGRLdSGQVGLYPANYVE 55

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 48.40 E-value: 4.56e-07

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                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGE------WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd12058      2 WTALYDYEASGEDELSLRRGDVVEVLSQDAAvsgddgWWAGKIRHRLGIFPANYVTR 58

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 48.02 E-value: 4.67e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11964      5 AIYDFEAAEDNELTFKAGDIItILDDSDPNWWKGETPQGTGLFPSNFV 52

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 47.91 E-value: 4.80e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11870      3 VALHRYEAQGPEDLGFREGDTIDVlSEVNEAWLEGHSDGRVGIFPKCFVVP 53

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 47.91 E-value: 4.93e-07

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11949      3 QALFDFDPQEDGELGFRRGDFIEVMDNS--DPNWWKGACHGQTGMFPRNYVT 52

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 47.85 E-value: 4.96e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd11784      3 VALHSYSAHRPEELELQKGEGVRVLGKFQEGWLRGLslVTGRVGIFPSNYV 53

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 47.81 E-value: 4.98e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNK--DDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11866      4 GLWDCSGNEPDELSFKRGDLIYIISKeyDSFGWWVGELNGKVGLVPKDYL 53

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 48.07 E-value: 5.09e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEP--GWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11791      2 LRVLYPYTPQEEDELELVPGDYIYVSPEELDSSsdGWVEGTSWltGCSGLLPENYTEK 59

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 47.90 E-value: 5.20e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11961      2 AKALYDYDAAEDNELSFFENDKIINIEfVDDDWWLGECHGSRGLFPSNYVE 52

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 47.88 E-value: 5.29e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYGSFQGKFGWFPCNY 833
Cdd:cd11778      4 ALYDYEAQGDDEISIRVGDRIAVIRGDDGS-GWTYGEINGVKGLFPTSY 51

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 47.76 E-value: 5.84e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958785258  933 ENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:cd12061     13 EDELSFSKGDVIHVTRVEEGgWWEGTHNGRTGWFPSNYVR 52

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 47.48 E-value: 5.92e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSY 969
Cdd:cd11818      1 KARALYDFTGENEDELSFKAGDIITELESiDEEWMSGELRGKSGIFPKNF 50

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 47.79 E-value: 6.09e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtVGEPgWLYGSFQGKFGWFPCNYV 834
Cdd:cd11816      3 VARFDFEGEQEDELSFSEGDVITLKEY-VGEE-WAKGELNGKIGIFPLNFV 51

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 47.73 E-value: 6.12e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE---WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11875      4 VLFDYEAENEDELTLREGDIVTILSKDCEdkgWWKGELNGKRGVFPDNFVEP 55

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 47.64 E-value: 6.15e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258  928 WTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11995      9 YTAQNDDELAFSKGQIINVLNKEDpDWWKGELNGQVGLFPSNYVKL 54

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 47.68 E-value: 6.40e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG--EINGVTGLFPSNYVK 1201
Cdd:cd11934      7 AVYDYNAADEDEVSFQDGDTIVNVQQIDDGWMYGtvERTGDTGMLPANYVE 57

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 47.67 E-value: 7.27e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11996      5 AMYDYTANNEDELSFSKGQLINVLNKD--DPDWWQGEINGVTGLFPSNYVK 53

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 47.78 E-value: 7.30e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE-----WWTGSIGERTGIFPS 1050
Cdd:cd11762      4 ALYDYEAQSDEELSFPEGAIIRILRKDDNgvddgWWEGEFNGRVGVFPS 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 47.68 E-value: 7.32e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGK--FGWFPCNYVEKM 837
Cdd:cd11917      7 FQALYNYMPRNEDELELREGDVIDVMEKC--DDGWFVGTSRRTkfFGTFPGNYVKRL 61

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 47.38 E-value: 7.42e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11828      3 EALWDHVTMDPEELGFKAGDVIEVLDmSDKDWWWGSIRDEEGWFPASFVR 52

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.51 E-value: 7.42e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDE-MSFNSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11829      3 RTLYAFTGEQHQQgLSFEAGELIRVLQ--APDGGWWEGEKDGLRGWFPASYV 52

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 47.59 E-value: 7.76e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELqargkKRQKGWFPASHVKLL 1134
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGET-----GGRVGLVPSTAVEEI 54

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 47.25 E-value: 8.60e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11927      3 AKALYNYEGKEPGDLKFSKGDIIILRRQvDENWYHGEVNGIHGFFPTNFVQI 54

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 47.23 E-value: 8.93e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11952      3 VYALWDYSAEFPDELSFKEGDMVTVLRKDgeGTDWWWASLCGREGYVPRNY 53

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 47.29 E-value: 9.36e-07

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVK 1201
Cdd:cd11917      9 ALYNYMPRNEDELELREGDVIDVMEKCDDGWFVGTSRRTKffGTFPGNYVK 59

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 47.39 E-value: 9.37e-07

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVL---EQQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11841      2 VTALYSFEGQQPCDLSFQAGDRITVLtrtDSQFDWWEGRLRGRVGIFPANYVS 54

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 47.30 E-value: 9.38e-07

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                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12060      6 ARFNFKQTNEDELSVCKGDIIYVTRvEEGGWWEGTLNGKTGWFPSNYVR 54

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 47.34 E-value: 9.43e-07

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDpDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11990      4 ALCSWTAKKDNHLNFSKNDIITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 52

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.12 E-value: 9.48e-07

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                   ....*....|....*....|....*....|....*.
gi 1958785258  936 LNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 970
Cdd:cd11829     17 LSFEAGELIRVLQAPDGgWWEGEKDGLRGWFPASYV 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 3; GRAF3 is also called Rho GTPase activating protein 42 (ARHGAP42) or ARHGAP10-like. Though its function has not been characterized, it may be a GAP with activity towards RhoA and Cdc42, based on its similarity to GRAF and GRAF2. It contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212999 Cd Length: 55 Bit Score: 47.36 E-value: 9.74e-07

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12066      3 KAMYSCKAEHSHELSFPQGAIFSNVYPSV-EPGWLKATYEGKTGLVPENYVV 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 47.25 E-value: 1.01e-06

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11964      4 RAIYDFEAAEDNELTFKAGDIITILDDS--DPNWWKGETPQGTGLFPSNFV 52

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 47.07 E-value: 1.13e-06

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gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ---ENWWFGEVHGGRGWFPKSYV 970
Cdd:cd12142      1 YCRVLFDYNPVAPDELALKKGDVIEVISKEtedEGWWEGELNGRRGFFPDNFV 53

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 46.94 E-value: 1.25e-06

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gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVIT-VLEQQENWWFGEVHGGR-GWFPKSYVK 971
Cdd:cd11825      2 VKALYDYRAQRPDELSFCKHAIITnVEKEDGGWWRGDYGGKKqKWFPANYVE 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1); MPP1, also called 55 kDa erythrocyte membrane protein (p55), is a ubiquitously-expressed scaffolding protein that plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. It was originally identified as an erythrocyte protein that stabilizes the actin cytoskeleton to the plasma membrane by forming a complex with 4.1R protein and glycophorin C. MPP1 is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains the three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213013 Cd Length: 62 Bit Score: 47.26 E-value: 1.30e-06

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gi 1958785258 1153 AMYDY-------IANNEDELNFSKGQLINVMNKDDPDWWQGEINGV----TGLFPS 1197
Cdd:cd12080      4 AQFDYdpkkdnlIPCKEAGLKFQTGDIIQIINKDDSNWWQGRVEGSgeesAGLIPS 59

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 46.92 E-value: 1.33e-06

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN--GVTGLFPSNYVK 1201
Cdd:cd11933      6 AMYDYRAADDDEVSFKDGDTIVNVQTIDEGWMYGTVQrtGKTGMLPANYVE 56

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 46.72 E-value: 1.35e-06

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gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 970
Cdd:cd11951      2 VQAQYDFSAEDPSQLSFRRGDIIEVLDCPDpNWWRGRISGRVGFFPRNYV 51

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 46.64 E-value: 1.44e-06

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gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELqaRGKkrqKGWFPASHV 1131
Cdd:cd11827      7 AYDAQDTDELSFNEGDIIEILKEDPSGWWTGRL--RGK---EGLFPGNYV 51

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 46.63 E-value: 1.48e-06

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPdWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11989      1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 52

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 46.51 E-value: 1.49e-06

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gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVKL 1133
Cdd:cd11996      9 YTANNEDELSFSKGQLINVLNKDDPDWWQGEING-----VTGLFPSNYVKM 54

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 46.63 E-value: 1.58e-06

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gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11989      3 QALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVK 51

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 46.60 E-value: 1.65e-06

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gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11824      2 YSVLYDYTAQEDDELSISKGDVVAVIEK--GEDGWWTVERNGQKGLVPGTYLEK 53

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 46.61 E-value: 1.66e-06

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                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11828      1 LAEALWDHVTMDPEELGFKAGDVIEVLDMSDkDWWWGSIRDEEGWFPASFVRL 53

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 46.33 E-value: 1.69e-06

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gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11947      1 EARGKFDFTASGEDELSFKKGDVLKILSSDDIWFKAELNGEEGYVPKNFVDI 52

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 46.56 E-value: 1.69e-06

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                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGK-----FGWFPCNYVEK 836
Cdd:cd11839      3 QVIAPFTATAENQLSLAVGQLVLVRKKS--PSGWWEGELQARgkkrqIGWFPANYVKL 58

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 46.36 E-value: 1.72e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGD-IIQVDektVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11961      3 KALYDYDAAEDNELSFFENDkIINIE---FVDDDWWLGECHGSRGLFPSNYVE 52

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 46.56 E-value: 1.73e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12077      3 YVTVQPYTSQGKDEIGFEKGVTVEVIQKNL--EGWWYIRYLGKEGWAPASYLKK 54

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 46.54 E-value: 1.77e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLV--TQKDGeWWTG--SIGERtGIFPSNYVRP 1055
Cdd:cd11770      1 LYEALSDFQAEQEGDLSFKKGEVLRIisKRADG-WWLAenSKGNR-GLVPKTYLKV 54

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 46.49 E-value: 1.79e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVT-QKDGEWWTGSI-GE--RTGIFPSNYV 1053
Cdd:cd11966      4 ALYNCVADNPDELTFSEGEIIIVDgEEDKEWWIGHIdGEptRRGAFPVSFV 54

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 46.49 E-value: 1.85e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSIGERTGIFPSNYV 1053
Cdd:cd11766      1 PAVVKFNYEAQREDELSLRKGDRVLVLEKssDG-WWRGECNGQVGWFPSNYV 51

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 46.43 E-value: 2.03e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12052      1 EAIVEFDYKAQHEDELTITVGDIITkIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 52.63 E-value: 2.03e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  378 ELEKRRQVLmeQQQREAERKAQKEKEEWERKQ--------RELQEQEWKKQLELEKRLEKQRELERQreeerrkeierre 449
Cdd:COG1196    197 ELERQLEPL--ERQAEKAERYRELKEELKELEaellllklRELEAELEELEAELEELEAELEELEAE------------- 261

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  450 scisfplMREREwisvykdrkgfmAELwkpgsCAAKQELERQR-RLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLE 528
Cdd:COG1196    262 -------LAELE------------AEL-----EELRLELEELElELEEAQAEEYELLAELARLEQDIARLEERRRELEER 317

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  529 LEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCDLEIMEIKQLQQELQEYQNKLIYLvpEKQLLNERIKNMQLSntp 608
Cdd:COG1196    318 LEELEEELAELEEELEELEEELEELEEELEEAEEELEEAEAELAEAEEALLEAEAELAEA--EEELEELAEELLEAL--- 392

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  609 dsgisllhKKSSEKEELCQRLKEQLDALEKETASKLSEmdsfnnqlkcgnmddsvlqcllsllsclnnlfllLKELRESY 688
Cdd:COG1196    393 --------RAAAELAAQLEELEEAEEALLERLERLEEE----------------------------------LEELEEAL 430

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  689 NTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQgkenlwkesIRKEEEEKQKRLQEEKSQDRTQEEERK 768
Cdd:COG1196    431 AELEEEEEEEEEALEEAAEEEAELEEEEEALLELLAELLEEAAL---------LEAALAELLEELAEAAARLLLLLEAEA 501

                          410
                   ....*....|....
gi 1958785258  769 TEAKQSETARALVN 782
Cdd:COG1196    502 DYEGFLEGVKAALL 515

Src homology 3 domain of Src-Like Adaptor Proteins; SLAPs are adaptor proteins with limited similarity to Src family tyrosine kinases. They contain an N-terminal SH3 domain followed by an SH2 domain, and a unique C-terminal sequence. They function in regulating the signaling, ubiquitination, and trafficking of T-cell receptor (TCR) and B-cell receptor (BCR) components. Vertebrates contain two SLAPs, named SLAP (or SLA1) and SLAP2 (or SLA2). SLAP has been shown to interact with the EphA receptor, EpoR, Lck, PDGFR, Syk, CD79a, among others, while SLAP2 interacts with CSF1R. Both SLAPs interact with c-Cbl, LAT, CD247, and Zap70. SLAP modulates TCR surface expression levels as well as surface and total BCR levels. As an adaptor to c-Cbl, SLAP increases the ubiquitination, intracellular retention, and targeted degradation of the BCR complex components. SLAP2 plays a role in c-Cbl-dependent regulation of CSF1R, a tyrosine kinase important for myeloid cell growth and differentiation. The SH3 domain of SLAP forms a complex with v-Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212782 Cd Length: 55 Bit Score: 46.41 E-value: 2.09e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTgSIGERTG---IFPSNYV 1053
Cdd:cd11848      3 VALGDYPSGGPAELSLRLGEPLTIVSDEGDWWK-VLSEVTGresYIPSVHV 52

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 46.09 E-value: 2.13e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ--QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11976      2 AKARYDFCARDRSELSLKEGDIIKILNKkgQQGWWRGEIYGRVGWFPANYVE 53

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 46.09 E-value: 2.14e-06

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11929      5 ALCNYRGHNPGDLKFNKGDVILLrRQLDENWYLGEINGVSGIFPASSVE 53

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 46.18 E-value: 2.17e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLY-GSFQGKFGWFPCNYV 834
Cdd:cd11904      4 QALYPFSSSNDEELNFEKGEVMDVIEKPENDPEWWKcRKANGQVGLVPKNYV 55

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 46.10 E-value: 2.18e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11995      5 GMYDYTAQNDDELAFSKGQIINVLNKE--DPDWWKGELNGQVGLFPSNYVK 53

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 46.23 E-value: 2.27e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11841      4 ALYSFEGQQPCDLSFQAGDRITVLTRTDSQFDWWEGRLRGRVGIFPANYV 53

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 46.16 E-value: 2.29e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMN-KDDPDWWQGEI--NGVTGLFPSNYVK 1201
Cdd:cd11775      2 RGKVLYDFDAQSDDELTVKEGDVVYILDdKKSKDWWMVENvsTGKEGVVPASYIE 56

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 46.15 E-value: 2.32e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSI-GERTGIFPSNYV 1053
Cdd:cd11819      3 KALYDYQAAEDNEISFVEGDIITqIEQIDEGWWLGVNaKGQKGLFPANYV 52

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 46.18 E-value: 2.38e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11781      1 KARALYPFKAQSAKELSLKKGDIIYIRRQiDKNWYEGEHNGRVGIFPASYVEI 53

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 45.87 E-value: 2.44e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSY--SSVEPGDLTFTEGEELLVTQKDGEWWTG--SIGErTGIFPSNYVR 1054
Cdd:cd11855      4 ALYPYdaSPDDPNELSFEKGEILEVSDTSGKWWQArkSNGE-TGICPSNYLQ 54

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 46.11 E-value: 2.47e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVKM 1202
Cdd:cd11924      2 EAVAQYTFKGDLEVELSFRKGEHICLIRKVNENWYEGRITGTGrqGIFPASYVQV 56

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 46.09 E-value: 2.62e-06

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11985      3 VALYKFLPQENNDLPLQPGDRVMVVDDSNEDWWKGKSGDRVGFFPANFVQ 52

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 46.15 E-value: 2.71e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHV 1131
Cdd:cd11902      3 AFVKFAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNG-----QIGWFPSNYV 52

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 46.10 E-value: 2.76e-06

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11995      2 QVIGMYDYTAQNDDELAFSKGQIInVLNKEDPDWWKGELNGQVGLFPSNYVK 53

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 45.80 E-value: 2.92e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd11901      4 AYVKFNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQ-----VGWFPSNYV 53

Src Homology 3 domain of Bruton's tyrosine kinase; BTK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain with proline-rich and zinc-binding regions. Btk is expressed in B-cells, and a variety of myeloid cells including mast cells, platelets, neutrophils, and dendrictic cells. It interacts with a variety of partners, from cytosolic proteins to nuclear transcription factors, suggesting a diversity of functions. Stimulation of a diverse array of cell surface receptors, including antigen engagement of the B-cell receptor (BCR), leads to PH-mediated membrane translocation of Btk and subsequent phosphorylation by Src kinase and activation. Btk plays an important role in the life cycle of B-cells including their development, differentiation, proliferation, survival, and apoptosis. Mutations in Btk cause the primary immunodeficiency disease, X-linked agammaglobulinaemia (XLA) in humans. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212839 [Multi-domain] Cd Length: 55 Bit Score: 45.97 E-value: 2.95e-06

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG-EINGVTGLFPSNYV 1200
Cdd:cd11906      3 VVALYDYTPMNAQDLQLRKGEEYVILEESNLPWWRArDKNGREGYIPSNYV 53

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 45.71 E-value: 2.96e-06

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gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:cd11856      4 AIADYEAQGDDEISLQEGEVVEVLEKNDSgWWYVRKGDKEGWVPASYLE 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 45.58 E-value: 3.19e-06

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11948      4 ALYSFQATESDELPFQKGDILKILNME-DDQNWYKAELQGREGYIPKNYIK 53

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 45.48 E-value: 3.20e-06

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gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11838      3 IALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVR 51

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 45.78 E-value: 3.28e-06

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gi 1958785258 1082 AYAASGAEQLSLAPGQLI-LILKKNSSGWWQGELQargKKRQKGWFPASHVK 1132
Cdd:cd11779      8 PHAAGGETQLSFEEGDVItLLGPEPRDGWHYGENE---RSGRRGWFPIAYTE 56

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 45.83 E-value: 3.30e-06

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gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEK--TVGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11800      2 YYALYTFEARSPGELSVTEGQVVTVLEKhdLKGNPEWWLVEDRGKQGYVPSNYLAK 57

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 45.77 E-value: 3.30e-06

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNK--DDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11977      4 VARYNFAARDMRELSLREGDVVRIYSRigGDQGWWKGETNGRIGWFPSTYVE 55

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 45.45 E-value: 3.33e-06

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gi 1958785258  776 TARALVNYRALYPfearnhDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11828      1 LAEALWDHVTMDP------EELGFKAGDVIEVLDMS--DKDWWWGSIRDEEGWFPASFV 51

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 45.70 E-value: 3.33e-06

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gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQ-LINVMNKDDPDWWQGEIN-GVTGLFPSNYV 1200
Cdd:cd11999      3 RVRAVYDYTGQEPDELSFKAGEeLLKVEDEDEQGWCKGVTDgGAVGLYPANYV 55

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 45.62 E-value: 3.39e-06

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gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDP--DWWQGEINGVTGLFPSNYV 1200
Cdd:cd12044      4 GLWDCFGDNPDELSFQRGDLIYILSKEYNmyGWWVGELNGIVGIVPKDYL 53

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 45.78 E-value: 3.40e-06

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gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDD---PDWWQGEINGVTGLFPSN 1198
Cdd:cd11954      3 VYALWDYEAQNADELSFQEGDAITILRRKDdseTEWWWARLNDKEGYVPKN 53

Src homology 3 domains of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212785 Cd Length: 62 Bit Score: 45.77 E-value: 3.65e-06

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gi 1958785258 1151 VIAMYDYI-------ANNEDELNFSKGQLINVM-NKDDPDWWQGEINGV-TGLFPSNYVK 1201
Cdd:cd11851      2 MVALYDYNpetmspnDDPEEELSFHAGDVVRVYgPMDEDGFYYGELEGGrKGLVPSNFVQ 61

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 45.57 E-value: 3.66e-06

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gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPSNYV 1200
Cdd:cd11889      2 VKAVYSWAGETEGDLGFLEGDLIEVLSIGDGSWWSGKLrrNGAEGIFPSNFV 53

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 45.80 E-value: 3.66e-06

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gi 1958785258  919 NLKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11901      1 NLPAYVKFNYTAEREDELSLVKGTKVIVMEKcSDGWWRGSYNGQVGWFPSNYV 53

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 45.58 E-value: 3.89e-06

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  778 RALVNYRAlypfeARNHDEMSFNSGDIIQVdekTVGEP--GWLYGSFQG--KFGWFPCNYVEKM 837
Cdd:cd11914      4 RAIVSHPA-----GSNPTLLRFNRGDIITV---LVPEArnGWLYGKLEGssRQGWFPEAYVKAL 59

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 45.72 E-value: 3.94e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG--EINGVTGLFPSNYV 1200
Cdd:cd11918      6 AVYQYRPQNEDELELREGDRVDVMQQCDDGWFVGvsRRTQKFGTFPGNYV 55

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 45.43 E-value: 3.95e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTG---SIGErTGIFPSNYVRP 1055
Cdd:cd12006      3 FVALYDYEARTEDDLSFHKGEKFqILNSSEGDWWEArslTTGE-TGYIPSNYVAP 56

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 45.38 E-value: 3.95e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGG-RGWFPKSYVKI 972
Cdd:cd11819      2 AKALYDYQAAEDNEISFVEGDIITQIEQiDEGWWLGVNAKGqKGLFPANYVEL 54

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 45.49 E-value: 3.97e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTG---SIGeRTGIFPSNYVRP 1055
Cdd:cd12008      2 FVALYDYESRTETDLSFKKGERLqIVNNTEGDWWLAhslTTG-QTGYIPSNYVAP 55

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 45.44 E-value: 3.97e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11974      3 AEALWDHVTMDDQELAFKAGDVIRVLEaSNKDWWWGRNEDREAWFPASFVRL 54

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 45.59 E-value: 4.09e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd12073      3 AVALYDYQGEGDDEISFDPQETITDIEMvDEGWWKGTCHGHRGLFPANYVEL 54

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 45.41 E-value: 4.10e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12076      4 TVIYPYTARDQDEINLEKGAVVEVIQKNLEGWWKIRYQGKEGWAPASYLK 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 45.42 E-value: 4.26e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11782      1 EARAKYNFNADTGVELSFRKGDVITLTRRvDENWYEGRIGGRQGIFPVSYVQV 53

Src Homology 3 domain of SH3 domain-binding protein 4; SH3 domain-binding protein 4 (SH3BP4) is also called transferrin receptor trafficking protein (TTP). SH3BP4 is an endocytic accessory protein that interacts with endocytic proteins including clathrin and dynamin, and regulates the internalization of the transferrin receptor (TfR). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212691 Cd Length: 52 Bit Score: 45.40 E-value: 4.29e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11757      1 EVVAIKDYCPTNFTTLKFSKGDHLYVLDTSGGEWWYAHNTTEMGYIPSSYVQ 52

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 45.39 E-value: 4.32e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 970
Cdd:cd11826      1 KVVALYDYTADKDDELSFQEGDIIYVTKKNDDgWYEGVLNGVTGLFPGNYV 51

Calcium binding and coiled-coil domain (CALCOCO1) like; Proteins found in this family are similar to the coiled-coil transcriptional coactivator protein coexpressed by Mus musculus (CoCoA/CALCOCO1). This protein binds to a highly conserved N-terminal domain of p160 coactivators, such as GRIP1, and thus enhances transcriptional activation by a number of nuclear receptors. CALCOCO1 has a central coiled-coil region with three leucine zipper motifs, which is required for its interaction with GRIP1 and may regulate the autonomous transcriptional activation activity of the C-terminal region.

Pssm-ID: 462303 [Multi-domain] Cd Length: 488 Bit Score: 51.05 E-value: 4.38e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  378 ELEKRRQVLME-----QQQREAERKAQK-EKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEIERRESC 451
Cdd:pfam07888   38 ECLQERAELLQaqeaaNRQREKEKERYKrDREQWERQRRELESRVAELKEELRQSREKHEELEEKYKELSASSEELSEEK 117

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  452 ISfpLMREREwisvykDRKGFMAELWKPGSCAAKQELERQRRLEWERIRRQELLNQKNREQEEivrlnskKKSLHLELEA 531
Cdd:pfam07888  118 DA--LLAQRA------AHEARIRELEEDIKTLTQRVLERETELERMKERAKKAGAQRKEEEAE-------RKQLQAKLQQ 182

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  532 VNGKHQQISGRLQDVRIRKQTQKTELevldkqcdleimeikqlqqelqeyqnkliylvpekQLLNERIKNMQLSNTPdsg 611
Cdd:pfam07888  183 TEEELRSLSKEFQELRNSLAQRDTQV-----------------------------------LQLQDTITTLTQKLTT--- 224

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  612 islLHKKSSEKEELCQRLK---EQLDALEKETA---SKLSEMDSFNNQLKcGNMDDSVLQCLLSLLSCLNNLfLLLKELR 685
Cdd:pfam07888  225 ---AHRKEAENEALLEELRslqERLNASERKVEglgEELSSMAAQRDRTQ-AELHQARLQAAQLTLQLADAS-LALREGR 299

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  686 ESYNTQQLALEQLHKIKRDKLKELER------KRL--EQIQKKKLEDEAARKakqgkenlwKESIRKEEEEKQKRLQEEK 757
Cdd:pfam07888  300 ARWAQERETLQQSAEADKDRIEKLSAelqrleERLqeERMEREKLEVELGRE---------KDCNRVQLSESRRELQELK 370

                          410
                   ....*....|....*....
gi 1958785258  758 SQDR-TQEEERKTEAKQSE 775
Cdd:pfam07888  371 ASLRvAQKEKEQLQAEKQE 389

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 45.34 E-value: 4.48e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGE-RTGIFPSNYVRP 1055
Cdd:cd11768      3 VALYDFQPIEPGDLPLEKGEEYVVLDDSNEhWWRARDKNgNEGYIPSNYVTE 54

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 45.42 E-value: 4.52e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11782      1 EARAKYNFNADTGVELSFRKGDVITLTRRvDENWYEGRIGGRQGIFPVSYV 51

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 45.38 E-value: 4.64e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYG-SFQGKFGWFPCNYVE 835
Cdd:cd11767      3 VALYPFTGENDEELSFEKGERLEIIEKPEDDPDWWKArNALGTTGLVPRNYVE 55

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 45.49 E-value: 4.77e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12064      4 KALYACKAEHDSELSFTAGTVFD-NVHPSQEPGWLEGTLNGKTGLIPENYVE 54

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 45.19 E-value: 4.84e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSF-QGKFGWFPCNYV 834
Cdd:cd11812      4 ALYDYTANRSDELTIHRGDIIRVLYKD--NDNWWFGSLvNGQQGYFPANYV 52

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 51.28 E-value: 4.97e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLPVTFEDKRKANYERGNMElEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKrlE 428
Cdd:pfam17380  404 VKILEEERQRKIQQQKVEMEQIRAEQEEAR-QREVRRLEEERAREMERVRLEEQERQQQVERLRQQEEERKRKKLEL--E 480

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  429 KQRELERQREEERRKEIERRescisfplMREREWISVYKDRKGFMAELWKPGSCAAKQELERQRRLEWERiRRQELLNQK 508
Cdd:pfam17380  481 KEKRDRKRAEEQRRKILEKE--------LEERKQAMIEEERKRKLLEKEMEERQKAIYEEERRREAEEER-RKQQEMEER 551

                          170
                   ....*....|....*..
gi 1958785258  509 NREQEEIVRLNSKKKSL 525
Cdd:pfam17380  552 RRIQEQMRKATEERSRL 568

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 45.20 E-value: 4.98e-06

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDE-LNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11829      4 TLYAFTGEQHQQgLSFEAGELIRVLQAPDGGWWEGEKDGLRGWFPASYV 52

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 45.19 E-value: 5.02e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1003 EEYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGE-RTGIFPSNYVRPK 1056
Cdd:cd11905      1 EIVVAMYDFQPTEPHDLRLETGEEYVILEKnDVHWWKARDKYgKEGYIPSNYVTGK 56

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 45.15 E-value: 5.17e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEWW-------TGsigeRTGIFPSNYVRP 1055
Cdd:cd11784      2 CVALHSYSAHRPEELELQKGEGVRVLGKFQEGWlrglslvTG----RVGIFPSNYVSP 55

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 45.21 E-value: 5.26e-06

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTG-IFPSNYV 1053
Cdd:cd11969      4 ALYDYRAKRSDELSFCKGALIHnVSKETGGWWKGDYGGKVQhYFPSNYV 52

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 45.78 E-value: 5.34e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11973     22 ALWDHVTMDDQELGFKAGDVIEVMDATNKEWWWGRVLDSEGWFPASFVRL 71

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 45.19 E-value: 5.34e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGE-RTGIFPSNYV 1053
Cdd:cd11812      3 VALYDYTANRSDELTIHRGDIIRVLYKDNDnWWFGSLVNgQQGYFPANYV 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 45.04 E-value: 5.37e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKD-GE--WWTGSIGERTGIFPSNYV 1053
Cdd:cd11836      2 YRALYAFEARNPDEISFQPGDIIQVDESQvAEpgWLAGELKGKTGWFPANYV 53

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 44.97 E-value: 5.50e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGW-----LYGSFQGKFGWFPCNY 833
Cdd:cd11883      3 VALYDFTPKSKNQLSFKAGDIIYVLNK--DPSGWwdgviISSSGKVKRGWFPSNY 55

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 45.15 E-value: 5.67e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1008 LYSYSSVEPGDLTFTEGEELLVTQKDGE---WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd12142      5 LFDYNPVAPDELALKKGDVIEVISKETEdegWWEGELNGRRGFFPDNFVMP 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 44.95 E-value: 5.92e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  781 VNYRALYPFEARNHDEMSFNSG-DIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 835
Cdd:cd11997      2 VRVRALYDYTGQEADELSFKAGeELLKIGEED--EQGWCKGRLLsGRIGLYPANYVE 56

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 45.24 E-value: 6.03e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSIGER------TGIFPSNYV 1053
Cdd:cd11847      2 YKALWDFKARGDEELSFQAGDQFRIAERSGDWWTALKLDRaggvvaQGFVPNNYL 56

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 44.72 E-value: 6.14e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11959      2 AVALYDYQAADDDEISFDPDDIITNIEMiDEGWWRGVCRGKYGLFPANYVEL 53

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 44.66 E-value: 6.24e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSI-GERTGIFPSNYVRP 1055
Cdd:cd11837      2 ATALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELeGGEEGWFPKSYVKE 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 45.11 E-value: 6.54e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLI-NVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12064      5 ALYACKAEHDSELSFTAGTVFdNVHPSQEPGWLEGTLNGKTGLIPENYVE 54

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 44.88 E-value: 6.64e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  782 NYRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQ--GKFGWFPCNY 833
Cdd:cd11845      1 IYVALYDYEARTDDDLSFKKGDRLQILDDSDGD--WWLARHLstGKEGYIPSNY 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 44.82 E-value: 6.70e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11950      2 VRALYDFEALEDDELGFNSGDVIEVLDSSNpSWWKGRLHGKLGLFPANYVA 52

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 44.62 E-value: 6.92e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvGEpgWLYGSFQGKFGWFPCNYV 834
Cdd:cd11992      2 YIALYPYSSSEPGDLTFNEGEEILVTQKD-GE--WWTGSIEDRTGIFPSNYV 50

Src Homology 3 domain of Membrane Protein, Palmitoylated 7 (or MAGUK p55 subfamily member 7); MPP7 is a scaffolding protein that binds to DLG1 and promotes tight junction formation and epithelial cell polarity. Mutations in the MPP7 gene may be associated with the pathogenesis of diabetes and extreme bone mineral density. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212966 Cd Length: 61 Bit Score: 45.01 E-value: 6.99e-06

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1151 VIAMYDYIAN-------NEDELNFSKGQLINVMNKDDPDWWQ----GEINGVTGLFPSNY 1199
Cdd:cd12033      2 IKALFDYNPNedkaipcKEAGLSFKKGDILQIMSQDDATWWQakheGDANPRAGLIPSKH 61

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 45.06 E-value: 7.10e-06

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1150 QVIAMYDYIAN----NED---ELNFSKGQLINVMNKDDPD-WWQGEINGVTGLFPSNYVK 1201
Cdd:cd12013      1 RMVALFDYDPResspNVDaevELSFRAGDIITVFGEMDEDgFYYGELNGQRGLVPSNFLE 60

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 44.61 E-value: 7.21e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK---DGEWWTG--SIGErTGIFPSNYV 1053
Cdd:cd11767      3 VALYPFTGENDEELSFEKGERLEIIEKpedDPDWWKArnALGT-TGLVPRNYV 54

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 44.69 E-value: 7.25e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGS--IGERTGIFPSNYVRP 1055
Cdd:cd11783      2 YVALYPYKPQKPDELELRKGEMYTVTEKcqDG-WFKGTslRTGQSGVFPGNYVQP 55

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 44.48 E-value: 7.32e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11815      3 VVLHDFPAEHSDDLSLNSGEIVYLLEKiDTEWYRGKCKNTTGIFPANHVK 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 3; GRAF3 is also called Rho GTPase activating protein 42 (ARHGAP42) or ARHGAP10-like. Though its function has not been characterized, it may be a GAP with activity towards RhoA and Cdc42, based on its similarity to GRAF and GRAF2. It contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212999 Cd Length: 55 Bit Score: 44.67 E-value: 7.36e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLI-NVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12066      1 QAKAMYSCKAEHSHELSFPQGAIFsNVYPSVEPGWLKATYEGKTGLVPENYV 52

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 44.64 E-value: 7.60e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQG-----KFGWFPCNYVEK 836
Cdd:cd11887      5 KALYPYESDHEDDLNFDVGQLITVTEEEDAD--WYFGEYVDsngntKEGIFPKNFVEV 60

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 44.54 E-value: 7.80e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGE--PGWLYGSFQG-KFGWFPCNYVE 835
Cdd:cd11864      3 RAEYDFVAESEDELSFRAGDKLRLAPKELQPrvRGWLLATVDGqKIGLVPANYVK 57

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 44.43 E-value: 7.90e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTG---SIGERtGIFPSNYV 1053
Cdd:cd12005      3 VALYSYEPSHDGDLGFEKGEKLRILEQSGEWWKAqslTTGQE-GFIPFNFV 52

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 45.09 E-value: 7.90e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11975      9 AVWDHVTMANRELAFKAGDVIKVLDASNKDWWWGQIDDEEGWFPASFVRL 58

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 44.67 E-value: 7.91e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-----DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11800      2 YYALYTFEARSPGELSVTEGQVVTVLEKhdlkgNPEWWLVEDRGKQGYVPSNYLAK 57

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 44.64 E-value: 7.95e-06

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  787 YPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11901      8 FNYTAEREDELSLVKGTKVIVMEKC--SDGWWRGSYNGQVGWFPSNYV 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 44.57 E-value: 8.04e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11919      2 PARAKFDFKAQTLKELPLQKGDIVYIYKQIDQNWYEGEHHGRVGIFPRSYIEL 54

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 44.54 E-value: 8.54e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ--QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11830      2 AKARYDFCARDMRELSLKEGDVVKIYNKkgQQGWWRGEINGRIGWFPSTYVE 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 44.62 E-value: 8.67e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11920      1 LPARAVYDFKAQTSKELSFKKGDTVYILRKiDQNWYEGEHHGRVGIFPISYVE 53

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 44.53 E-value: 8.80e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11928      4 KALYSYEGKEPGDLKFNKGDIIILRRKV--DENWYHGELNGCHGFLPASYIQ 53

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 44.57 E-value: 8.84e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD----DPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11895      4 ALYSYTGQSPEELSFPEGALIRLLPRAqdgvDDGFWRGEFGGRVGVFPSLLVE 56

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 44.33 E-value: 9.26e-06

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGE-WWTGSIGERTGIFPSNYV 1053
Cdd:cd11843      4 ALYDYEGQESDELSFKAGDILTkLEEEDEQgWCKGRLDGRVGLYPANYV 52

Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk); TXK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal cysteine-rich region. Rlk is expressed in T-cells and mast cell lines, and is a key component of T-cell receptor (TCR) signaling. It is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212840 [Multi-domain] Cd Length: 55 Bit Score: 44.56 E-value: 9.37e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN-GVTGLFPSNYV 1200
Cdd:cd11907      2 QVKALYDFLPREPSNLALKRAEEYLILEQYDPHWWKARDRyGNEGLIPSNYV 53

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 44.45 E-value: 9.42e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  787 YPFEARNHDEMSFNSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd12053      6 YDYDAVHEDELTIRVGEIIR-NVKKLEEEGWLEGELNGRRGMFPDNFVKEI 55

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 50.45 E-value: 9.65e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  336 KQIDSINGTLPSYQKTQE--EEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQ 413
Cdd:PRK03918   207 REINEISSELPELREELEklEKEVKELEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEIEELEEKVKELK 286

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  414 EQEWKKQL----------------ELEKRLEK---------QRELERQREEERRKEIERRESCISFPLMREREWISVYKD 468
Cdd:PRK03918   287 ELKEKAEEyiklsefyeeyldelrEIEKRLSRleeeingieERIKELEEKEERLEELKKKLKELEKRLEELEERHELYEE 366

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  469 RKGFMAELWKPGSCAAKQELER-QRRLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQ--ISGRLQD 545
Cdd:PRK03918   367 AKAKKEELERLKKRLTGLTPEKlEKELEELEKAKEEIEEEISKITARIGELKKEIKELKKAIEELKKAKGKcpVCGRELT 446

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  546 VRIRKQTQKT---ELEVLDKqcdlEIMEIKQLQQELQEYQNKL-IYLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSE 621
Cdd:PRK03918   447 EEHRKELLEEytaELKRIEK----ELKEIEEKERKLRKELRELeKVLKKESELIKLKELAEQLKELEEKLKKYNLEELEK 522

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  622 KEELCQRLKEQLDALEKET---ASKLSEMDSFNNQLKcgnmddsVLQCLLSLLSCLNNLflLLKELRE----SYNTQQLA 694
Cdd:PRK03918   523 KAEEYEKLKEKLIKLKGEIkslKKELEKLEELKKKLA-------ELEKKLDELEEELAE--LLKELEElgfeSVEELEER 593

                          410       420       430       440       450       460       470       480
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  695 LEQLHKIKRDKL------KELERKrLEQIQKKKLEDEAARKAKQGKENLWkESIRKEEEEKQKRLQEEKSqdrtQEEERK 768
Cdd:PRK03918   594 LKELEPFYNEYLelkdaeKELERE-EKELKKLEEELDKAFEELAETEKRL-EELRKELEELEKKYSEEEY----EELREE 667

                          490
                   ....*....|.
gi 1958785258  769 TEAKQSETARA 779
Cdd:PRK03918   668 YLELSRELAGL 678

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 44.31 E-value: 9.73e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE--INGVTGLFPSNYVK 1201
Cdd:cd11783      2 YVALYPYKPQKPDELELRKGEMYTVTEKCQDGWFKGTslRTGQSGVFPGNYVQ 54

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 44.20 E-value: 9.76e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11991      2 YVAMYTYESNEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKTGVFPSNYV 50

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 50.36 E-value: 9.91e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  338 IDSINGTLPSYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRrqvlMEQQQREAERKAQKEKEEWERKQRELQEQEW 417
Cdd:pfam02463  599 IDPILNLAQLDKATLEADEDDKRAKVVEGILKDTELTKLKESAKA----KESGLRKGVSLEEGLAEKSEVKASLSELTKE 674

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  418 KKQLELEKRLEKQRELERQREEERRKEIERREScisfplmREREWISVYKDRKGFMAELWKPGSCAAKQELERQR----- 492
Cdd:pfam02463  675 LLEIQELQEKAESELAKEEILRRQLEIKKKEQR-------EKEELKKLKLEAEELLADRVQEAQDKINEELKLLKqkide 747

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  493 -RLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCDLEIMEI 571
Cdd:pfam02463  748 eEEEEEKSRLKKEEKEEEKSELSLKEKELAEEREKTEKLKVEEEKEEKLKAQEEELRALEEELKEEAELLEEEQLLIEQE 827

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  572 KQLQQELQEYQNKLIYLVPEKQLLNERIKNMQLSNTpdsgisLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDsfn 651
Cdd:pfam02463  828 EKIKEEELEELALELKEEQKLEKLAEEELERLEEEI------TKEELLQELLLKEEELEEQKLKDELESKEEKEKEE--- 898

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  652 NQLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELResYNTQQlalEQLHKIKRDKLKELERKRLEQIQKKKLEDEAarKAK 731
Cdd:pfam02463  899 KKELEEESQKLNLLEEKENEIEERIKEEAEILLK--YEEEP---EELLLEEADEKEKEENNKEEEEERNKRLLLA--KEE 971

                          410       420       430       440       450       460       470
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  732 QGKENLwkeSIRKEEEEKQKRLQEEKSQDRTQEEERKT--EAKQSETARALVNYRALYpFEARNHDEMSFNS 801
Cdd:pfam02463  972 LGKVNL---MAIEEFEEKEERYNKDELEKERLEEEKKKliRAIIEETCQRLKEFLELF-VSINKGWNKVFFY 1039

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 44.25 E-value: 1.00e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1150 QVIAMYDYIANNEDE---LNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11787      1 QCKALYDFEMKDEDEkdcLTFKKGDVITVIRRVDENWAEGRLGDKIGIFPISF 53

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 44.42 E-value: 1.02e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  923 QALCSWTAKKeNH--LNFSKHDVITVL--EQQENWWFGEVHGG--RGWFPKSYVK 971
Cdd:cd11914      4 RAIVSHPAGS-NPtlLRFNRGDIITVLvpEARNGWLYGKLEGSsrQGWFPEAYVK 57

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 44.34 E-value: 1.05e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWW-------TGSIGERTGIFPSNY 1052
Cdd:cd11773      2 YKALYDYEPQTEDELTIQEDDILYLLEKsDDDWWkvklkvnSSDDDEPVGLVPATY 57

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 44.23 E-value: 1.08e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVKL 1133
Cdd:cd11877      1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGK-----TGWFPSNYVKE 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 44.27 E-value: 1.10e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11804      3 VAKHDFKATAEDELSFKKGSILKVLNME-DDPNWYKAELDGKEGLIPKNYI 52

Pleckstrin homology domain-containing family G member 7 pleckstrin homology (PH) domain; PLEKHG7 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG7 is proposed to functions as a guanine nucleotide exchange factor (GEF) and is involved in the regulation of Rho protein signal transduction. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270065 Cd Length: 128 Bit Score: 46.50 E-value: 1.12e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1453 KLLYSGKLYKTKSNK--ELHGFLFNDFLLLTYLVRQFAASSGFEKLFS---------SKSSAQFKMYKTPIFLNEVLVK- 1520
Cdd:cd13245      1 QLLHEGPLTLIESGKtlDVYLFLFDDMLLITKMKKNLKKKKSSDSENSmpsleltplIKEGGSYTVYKQPIPLDRLCLHd 80

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1521 -LPTDPSSD--EPVFHISHIDR------VYTLRTDNINERTAWVQKIK 1559
Cdd:cd13245     81 vDPNEATANglKHAFVLVHLNRyqqvigVYTLQASSENTKQTWMSKLR 128

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 44.16 E-value: 1.14e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSS-----GWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd12058      8 YEASGEDELSLRRGDVVEVLSQDAAvsgddGWWAGKIRHR-----LGIFPANYV 56

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 44.17 E-value: 1.17e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11927      4 KALYNYEGKEPGDLKFSKGDIIilrrQVDEN------WYHGEVNGIHGFFPTNFVQ 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 5 (or MAGUK p55 subfamily member 5); MPP5, also called PALS1 (Protein associated with Lin7) or Nagie oko protein in zebrafish or Stardust in Drosophila, is a scaffolding protein which associates with Crumbs homolog 1 (CRB1), CRB2, or CRB3 through its PDZ domain and with PALS1-associated tight junction protein (PATJ) or multi-PDZ domain protein 1 (MUPP1) through its L27 domain. The resulting tri-protein complexes are core proteins of the Crumb complex, which localizes at tight junctions or subapical regions, and is involved in the maintenance of apical-basal polarity in epithelial cells and the morphogenesis and function of photoreceptor cells. MPP5 is critical for the proper stratification of the retina and is also expressed in T lymphocytes where it is important for TCR-mediated activation of NFkB. Drosophila Stardust exists in several isoforms, some of which show opposing functions in photoreceptor cells, which suggests that the relative ratio of different Crumbs complexes regulates photoreceptor homeostasis. MPP5 contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212969 Cd Length: 63 Bit Score: 44.33 E-value: 1.24e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1157 YIANNEDELNFSKGQLINVMNKDDPDWWQGEING------VTGLFPS 1197
Cdd:cd12036     15 YIPCRELGLSFQKGDILHVISQEDPNWWQAYREGeednqsLAGLIPS 61

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 44.04 E-value: 1.25e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKD-GE--WWTGSIGERTGIFPSNYV 1053
Cdd:cd12056      6 ALFHYEGTNEDELDFKEGEIILIISKDtGEpgWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 43.90 E-value: 1.26e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11824      1 KYSVLYDYTAQEDDELSISKGDVVAVIEKGEDgWWTVERNGQKGLVPGTYLEK 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 43.90 E-value: 1.30e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQE-----NWWFGEVHGGRGWFPKSY 969
Cdd:cd11800      4 ALYTFEARSPGELSVTEGQVVTVLEKHDlkgnpEWWLVEDRGKQGYVPSNY 54

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 44.22 E-value: 1.32e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11987      4 ALYPFEARSHDEITIQPGDIVMVDESQtgEPGWLGGELKGKTGWFPANYAE 54

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 44.02 E-value: 1.37e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11951      3 QAQYDFSAEDPSQLSFRRGDIIEVLDCP--DPNWWRGRISGRVGFFPRNYV 51

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 43.84 E-value: 1.41e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGE-INGVTGLFPSNYVKM 1202
Cdd:cd11770      2 YEALSDFQAEQEGDLSFKKGEVLRIISKRADGWWLAEnSKGNRGLVPKTYLKV 54

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 43.84 E-value: 1.44e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGElqarGKKRQKGWFPASHVKL 1133
Cdd:cd11819      8 YQAAEDNEISFVEGDIITQIEQIDEGWWLGV----NAKGQKGLFPANYVEL 54

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 43.88 E-value: 1.45e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11782      3 RAKYNFNADTGVELSFRKGDVItltrRVDEN------WYEGRIGGRQGIFPVSYVQ 52

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 43.78 E-value: 1.53e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILIL-KKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd11976      8 FCARDRSELSLKEGDIIKILnKKGQQGWWRGEIYGR-----VGWFPANYVE 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 6 (or MAGUK p55 subfamily member 6); MPP6, also called Veli-associated MAGUK 1 (VAM-1) or PALS2, is a scaffolding protein that binds to Veli-1, a homolog of Caenorhabditis Lin-7. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212971 Cd Length: 61 Bit Score: 43.90 E-value: 1.55e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1156 DYIANNEDELNFSKGQLINVMNKDDPDWWQG---EINGVTGLFPSNYV 1200
Cdd:cd12038     14 NLIPCKEAGLKFSKGEILQIVNREDPNWWQAshvKEGGSAGLIPSQFL 61

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 43.67 E-value: 1.56e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFG-WFPCNYVEKM 837
Cdd:cd11969      3 KALYDYRAKRSDELSFCKGALIHNVSKETG--GWWKGDYGGKVQhYFPSNYVEDV 55

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 43.74 E-value: 1.58e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGK--DNDGWWEGETGGRVGLVPSTAVEE 53

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 43.74 E-value: 1.62e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1154 MYDYIANNEDELNFSKGQLINVMNK--DDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12045      5 LWDCTGDQPDELSFKRGDTIYILSKeyNRFGWWVGEMKGTIGLVPKAYI 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 43.88 E-value: 1.62e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11875      1 KARVLFDYEAENEDELTLREGDIVTILSkdcEDKGWWKGELNGKRGVFPDNFVEP 55

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 43.64 E-value: 1.68e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12046      4 ALFSYEASQPEDLEFQKGDVILVLSKVNED--WLEGQCKGKIGIFPSAFVE 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 43.85 E-value: 1.68e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ--ENWWFGE-VHGGRGWFPKSYVKI 972
Cdd:cd11763      1 KVRALYDFDSQPSGELSLRAGEVLTITRQDvgDGWLEGRnSRGEVGLFPSSYVEI 55

Src homology 3 domain of Src-Like Adaptor Protein 2; SLAP2 plays a role in c-Cbl-dependent regulation of CSF1R, a tyrosine kinase important for myeloid cell growth and differentiation. It has been shown to interact with CSF1R, c-Cbl, LAT, CD247, and Zap70. SLAPs are adaptor proteins with limited similarity to Src family tyrosine kinases. They contain an N-terminal SH3 domain followed by an SH2 domain, and a unique C-terminal sequence. They function in regulating the signaling, ubiquitination, and trafficking of T-cell receptor (TCR) and B-cell receptor (BCR) components. The SH3 domain of SLAP forms a complex with v-Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212944 Cd Length: 55 Bit Score: 43.58 E-value: 1.70e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGEWWT--GSIGERTGIFPSNYV 1053
Cdd:cd12011      3 VALCNFPSGGPTELSIRMGEQLTILSEDGDWWKvsSAVTGRECYIPSNYV 52

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 43.88 E-value: 1.83e-05

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  919 NLKAQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKIIPG 975
Cdd:cd12001      2 NVLAKALYDNVAESPDELSFRKGDIMTVLERDtqglDGWWLCSLHGRQGIVPGNRLKILVG 62

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 43.84 E-value: 1.84e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:cd12060      2 LVVKARFNFKQTNEDELSVCKGDIIYVTRVEEGgWWEGTLNGKTGWFPSNYVR 54

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 43.47 E-value: 1.89e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIG-ERTGIFPSNYV 1053
Cdd:cd11825      4 ALYDYRAQRPDELSFCKHAIITnVEKEDGGWWRGDYGgKKQKWFPANYV 52

Pleckstrin homology (PH) domain; PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275388 [Multi-domain] Cd Length: 92 Bit Score: 44.84 E-value: 1.92e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1456 YSGKLYKT-----KSNKELHGFLFNDFLLltylvrqfaassgfeklFSSKSSAQFKMYKTPIFLNEVLVKLPTDPSSDEP 1530
Cdd:cd00821      1 KEGYLLKRgggglKSWKKRWFVLFEGVLL-----------------YYKSKKDSSYKPKGSIPLSGILEVEEVSPKERPH 63

                           90       100
                   ....*....|....*....|....*....
gi 1958785258 1531 VFHISH-IDRVYTLRTDNINERTAWVQKI 1558
Cdd:cd00821     64 CFELVTpDGRTYYLQADSEEERQEWLKAL 92

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 43.65 E-value: 1.92e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11948      1 EAVALYSFQATESDELPFQKGDILKILnmEDDQNWYKAELQGREGYIPKNYIKV 54

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 43.39 E-value: 1.95e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILIL-KKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd11830      1 TAKARYDFCARDMRELSLKEGDVVKIYnKKGQQGWWRGEINGR-----IGWFPSTYVE 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 43.41 E-value: 1.96e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTGSIGE-RTGIFPSNYV 1053
Cdd:cd11997      6 ALYDYTGQEADELSFKAGEELLKIGEEDEqgWCKGRLLSgRIGLYPANYV 55

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 43.71 E-value: 2.02e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKD--DPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd11988      6 ALYPFEARNHDEMSFNAGDIIQVDEKTvgEPGWLYGSFQGNFGWFPCNYVE 56

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 49.18 E-value: 2.08e-05

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  705 KLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKtEAKQSETAR 778
Cdd:pfam15709  346 RRLEVERKRREQEEQRRLQQEQLERAEKMREELELEQQRRFEEIRLRKQRLEEERQRQEEEERK-QRLQLQAAQ 418

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 43.52 E-value: 2.13e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258 1089 EQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVKL 1133
Cdd:cd11828     14 EELGFKAGDVIEVLDMSDKDWWWGSIRDE-----EGWFPASFVRL 53

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 43.45 E-value: 2.17e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  787 YPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11902      7 FAYVAEREDELSLVKGSRVTVMEKC--SDGWWRGSYNGQIGWFPSNYV 52

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 43.54 E-value: 2.20e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGS--FQGKFGWFPCNYV 834
Cdd:cd11783      2 YVALYPYKPQKPDELELRKGEMYTVTEKCQD--GWFKGTslRTGQSGVFPGNYV 53

First Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the first C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212845 [Multi-domain] Cd Length: 55 Bit Score: 43.37 E-value: 2.22e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQgEI---NGVTGLFPSNYVKM 1202
Cdd:cd11912      4 VLYDYTASGDDEVSISEGEEVTVLEPDDGSGWT-KVrngSGEEGLVPTSYIEI 55

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 43.39 E-value: 2.24e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGE--RTGIFPSNYV 1053
Cdd:cd11999      6 AVYDYTGQEPDELSFKAGEELLkVEDEDEQGWCKGVTDggAVGLYPANYV 55

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 43.05 E-value: 2.36e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11991      4 AMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVR 51

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 43.11 E-value: 2.36e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11796      3 RVLQDLSAQLDEELDLREGDVVTITG--ILDKGWFRGELNGRRGIFPEGFV 51

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 43.41 E-value: 2.37e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12021      2 YRAIADYEKSSKSEMALKTGDVVEVVEKS--ENGWWFCQLKAKRGWVPASYLE 52

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 43.24 E-value: 2.38e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNY 833
Cdd:cd11817      4 ALYDFTGETEEDLSFQRGDRILVTEHLDAE--WSRGRLNGREGIFPRAF 50

FYVE, RhoGEF and PH domain containing/faciogenital dysplasia proteins 5 and 6, N-terminal Pleckstrin Homology (PH) domain; FGD5 regulates promotes angiogenesis of vascular endothelial growth factor (VEGF) in vascular endothelial cells, including network formation, permeability, directional movement, and proliferation. The specific function of FGD6 is unknown. In general, FGDs have a RhoGEF (DH) domain, followed by a PH domain, a FYVE domain and a C-terminal PH domain. All FGDs are guanine nucleotide exchange factors that activate the Rho GTPase Cdc42, an important regulator of membrane trafficking. The RhoGEF domain is responsible for GEF catalytic activity, while the PH domain is involved in intracellular targeting of the DH domain. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275424 Cd Length: 124 Bit Score: 45.34 E-value: 2.39e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1452 RKLLYSGKLYKTkSNKEL---HGFLFNDFLLLTYlvrqfaassgfeklfSSKSSAQFKMYKTPIFLNeVLVKLPTDPS-S 1527
Cdd:cd13389     12 RKLIKEGELMKV-SRKEMqprYFFLFNDCLLYTT---------------PVQSSGMLKLNNELPLSG-MKVKLPEDEEyS 74

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258 1528 DEpvFHISHIDRVYTLRTDNINERTAWVQKIKAASEQYidteKKKR 1573
Cdd:cd13389     75 NE--FQIISTKRSFTLIASSEEERDEWVKALSRAIEEH----TKKQ 114

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 43.46 E-value: 2.60e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1003 EEYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11972      3 EKVVAIYDYTKDKEDELSFQEGAIIYVIKKnDDGWYEGVMNGVTGLFPGNYV 54

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 43.29 E-value: 2.60e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSIGERTGIFPSNYV 1053
Cdd:cd12022      2 YITIKAYTAVEEDELTLLEGEAIEVIHKllDG-WWVVRKGEVTGYFPSMYL 51

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 43.29 E-value: 2.63e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11956      3 EAVACFDYTGRTAQELSFKRGDVLLLHSKaSSDWWRGEHNGMRGLIPHKYI 53

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 43.39 E-value: 2.65e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  781 VNYRALYPFEARNHDEMSFNSGD-IIQVDEKTvgEPGWLYG-SFQGKFGWFPCNYVE 835
Cdd:cd11999      2 VRVRAVYDYTGQEPDELSFKAGEeLLKVEDED--EQGWCKGvTDGGAVGLYPANYVE 56

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 43.02 E-value: 2.70e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258  928 WTAKKENHLNFSKHDVIT-VLEQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11873      8 YDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVKV 53

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 43.08 E-value: 2.80e-05

                           10        20        30
                   ....*....|....*....|....*....|....*....
gi 1958785258  936 LNFSKHDVITVL----EQQENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11884     16 LSFHKGDVIKLLpkegPLDPGWLFGTLDGRSGAFPKEYV 54

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 48.26 E-value: 2.85e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  691 QQLALEQLHKI--KRDKLKELERKRLEQIQKKKLEDEAARKA----KQGKENLWK--ESIRKEEEEKQKRLQEEKSQdrt 762
Cdd:PRK09510    86 QQQAEELQQKQaaEQERLKQLEKERLAAQEQKKQAEEAAKQAalkqKQAEEAAAKaaAAAKAKAEAEAKRAAAAAKK--- 162

                           90
                   ....*....|....*..
gi 1958785258  763 QEEERKTEAKQSETARA 779
Cdd:PRK09510   163 AAAEAKKKAEAEAAKKA 179

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 43.03 E-value: 2.93e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPSNYV 1200
Cdd:cd11926      3 VAIYPYTPRKEDELELRKGEMFLVFERCQDGWFKGTSmhTSKIGVFPGNYV 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 43.05 E-value: 3.02e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11882      4 ALYACKAEDESELSFEPGQIITNVQPSDEpgWLEGTLNGRTGLIPENYVEF 54

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 42.76 E-value: 3.04e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11806      4 AIADFVATDDSQLSFESGDKLLVLRKpSVDWWWAEHNGCCGYIPASHL 51

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 42.88 E-value: 3.15e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQG-EINGVTGLFPSNYV 1200
Cdd:cd11905      3 VVAMYDFQPTEPHDLRLETGEEYVILEKNDVHWWKArDKYGKEGYIPSNYV 53

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 42.71 E-value: 3.16e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGE--ELLVTQKDGeWWTGSIGERTGIFPSNYV 1053
Cdd:cd11874      4 VLFSYTPQNEDELELKVGDtiEVLGEVEEG-WWEGKLNGKVGVFPSNFV 51

Second or C-terminal Src homology 3 domain of NADPH oxidase (Nox) Organizing protein 1; Nox Organizing protein 1 (NoxO1) is a critical regulator of enzyme kinetics of the nonphagocytic NADPH oxidase Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Nox1 is expressed in colon, stomach, uterus, prostate, and vascular smooth muscle cells. NoxO1 is involved in targeting activator subunits (such as NoxA1) to Nox1. It is co-localized with Nox1 in the membranes of resting cells and directs the subcellular localization of Nox1. NoxO1 contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of NoxO1. The tandem SH3 domains of NoxO1 interact with the PRR of p22phox, which also complexes with Nox1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212957 Cd Length: 53 Bit Score: 42.71 E-value: 3.35e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12024      4 ATRAYEAQKEDELSVPAGVVVEVLQKSDNGWWLIRYNGRAGYVPSMYLQ 52

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 43.06 E-value: 3.51e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1002 GEEYIALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIgERT---GIFPSNYV 1053
Cdd:cd11934      2 GKRYRAVYDYNAADEDEVSFQDGDTIVnVQQIDDGWMYGTV-ERTgdtGMLPANYV 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 42.95 E-value: 3.57e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12003      5 ALYDNAAESPEELSFRRGDVLMVLKREHGSlpgWWLCSLHGQQGIAPANRLRL 57

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 43.47 E-value: 3.58e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11973     20 AEALWDHVTMDDQELGFKAGDVIEVMDaTNKEWWWGRVLDSEGWFPASFVRL 71

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 43.07 E-value: 3.60e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKML 838
Cdd:cd11972      7 AIYDYTKDKEDELSFQEGAIIYVIKKN--DDGWYEGVMNGVTGLFPGNYVESIM 58

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 48.53 E-value: 3.60e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  483 AAKQELER-QRRLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLD 561
Cdd:TIGR02169  706 ELSQELSDaSRKIGEIEKEIEQLEQEEEKLKERLEELEEDLSSLEQEIENVKSELKELEARIEELEEDLHKLEEALNDLE 785

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  562 --------KQCDLEIMEIKQLQQELQEYQN----KLIYLVPEKQLLNERIKNMQLSNtpdsgISLLHKKSSEKE--ELCQ 627
Cdd:TIGR02169  786 arlshsriPEIQAELSKLEEEVSRIEARLReieqKLNRLTLEKEYLEKEIQELQEQR-----IDLKEQIKSIEKeiENLN 860

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  628 RLKEQLDALEKETASKLSEMDSFNNQLKcGNMDDSVLQcllsllsclnnlfllLKELRESYNTQQLALEQlhkiKRDKLK 707
Cdd:TIGR02169  861 GKKEELEEELEELEAALRDLESRLGDLK-KERDELEAQ---------------LRELERKIEELEAQIEK----KRKRLS 920

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  708 ELERK------RLEQIQKKKLEDEAARKAKQGKENLWKESIRKEE----------------EEKQKRLQEEKSQDRTQEE 765
Cdd:TIGR02169  921 ELKAKlealeeELSEIEDPKGEDEEIPEEELSLEDVQAELQRVEEeiralepvnmlaiqeyEEVLKRLDELKEKRAKLEE 1000


                   ...
gi 1958785258  766 ERK 768
Cdd:TIGR02169 1001 ERK 1003

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 42.75 E-value: 3.60e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYV 1053
Cdd:cd11824      1 KYSVLYDYTAQEDDELSISKGDVVAVIEKGEDgWWTVERNGQKGLVPGTYL 51

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 43.03 E-value: 3.64e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGE--ELLVTQKDG---EWWTGSIGERTGIFPS 1050
Cdd:cd11895      4 ALYSYTGQSPEELSFPEGAliRLLPRAQDGvddGFWRGEFGGRVGVFPS 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 42.69 E-value: 3.64e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11982      4 MAVKPYQSQAEGEISLSKGEKIKVLSVGEGGFWEGQVKGRVGWFPSDCV 52

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 42.58 E-value: 3.76e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1008 LYSYSSVEPGDLTFTEGEELLVTQK---DGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12057      5 LFPYEAQNEDELTIKEGDIVTLISKdciDAGWWEGELNGRRGVFPDNFVK 54

First Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the first SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213007 [Multi-domain] Cd Length: 53 Bit Score: 42.78 E-value: 3.88e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWqgelqARGKKRQKGWFPASHV 1131
Cdd:cd12074      4 VVSNYEKQENSEISLQAGEVVDVIEKNESGWW-----FVSTAEEQGWVPATYL 51

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 42.69 E-value: 3.90e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIgERT---GIFPSNYVRP 1055
Cdd:cd11789      2 YRAMYDYAAADDDEVSFQEGDVIInVEIIDDGWMEGTV-QRTgqsGMLPANYVEL 55

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 42.58 E-value: 3.91e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKN--SSGWWQGELQARgkkrqKGWFPASHVKLL 1134
Cdd:cd12057      3 KVLFPYEAQNEDELTIKEGDIVTLISKDciDAGWWEGELNGR-----RGVFPDNFVKLL 56

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 42.49 E-value: 3.93e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11833      2 YVALYKFKPQENEDLEMRPGDKITLLDDSNED--WWKGKIEDRVGFFPANFVQR 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 42.69 E-value: 3.95e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958785258 1018 DLTFTEGEELLVT-QKDGEWWTGSI---GERTGIFPSNYV 1053
Cdd:cd11965     15 ELTFVEGEVIIVTgEEDQEWWIGHIegqPERKGVFPVSFV 54

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 48.43 E-value: 4.01e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  368 RKANYERgnmELEKRRQVLMEQQQREA----ERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRK 443
Cdd:TIGR00618  220 RKQVLEK---ELKHLREALQQTQQSHAyltqKREAQEEQLKKQQLLKQLRARIEELRAQEAVLEETQERINRARKAAPLA 296

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  444 EIERRESCISFPLMREREWIsvyKDRKGFMAELWKPGSCAAKQE--LERQRRLEWERIRRQELLNQKNREQEEIVRLNSK 521
Cdd:TIGR00618  297 AHIKAVTQIEQQAQRIHTEL---QSKMRSRAKLLMKRAAHVKQQssIEEQRRLLQTLHSQEIHIRDAHEVATSIREISCQ 373

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  522 KKSL--HL-----ELEAVNGKHQQISGRLQDVRIRKQTQKTE----------LEVLDKQCDLE--IMEIKQLQQELQEYQ 582
Cdd:TIGR00618  374 QHTLtqHIhtlqqQKTTLTQKLQSLCKELDILQREQATIDTRtsafrdlqgqLAHAKKQQELQqrYAELCAAAITCTAQC 453

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  583 NKL--IYLVPEKQLLNERIKNMQLSNTpdsgislLHKKSSEKEELCQRLKEQLDALEKETASKLSE-----MDSFN---N 652
Cdd:TIGR00618  454 EKLekIHLQESAQSLKEREQQLQTKEQ-------IHLQETRKKAVVLARLLELQEEPCPLCGSCIHpnparQDIDNpgpL 526

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  653 QLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHK--IKRDKLKELE---RKRLEQIQ--------- 718
Cdd:TIGR00618  527 TRRMQRGEQTYAQLETSEEDVYHQLTSERKQRASLKEQMQEIQQSFSIltQCDNRSKEDIpnlQNITVRLQdlteklsea 606

                          410       420       430       440       450       460
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258  719 KKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQdRTQEEERKTEAKQSETARALVNYRALY 787
Cdd:TIGR00618  607 EDMLACEQHALLRKLQPEQDLQDVRLHLQQCSQELALKLTA-LHALQLTLTQERVREHALSIRVLPKEL 674

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1)-like proteins; This subfamily includes MPP1, CASK (Calcium/calmodulin-dependent Serine protein Kinase), Caenorhabditis elegans lin-2, and similar proteins. MPP1 and CASK are scaffolding proteins from the MAGUK (membrane-associated guanylate kinase) protein family, which is characterized by the presence of a core of three domains: PDZ, SH3, and guanylate kinase (GuK). In addition, they also have the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. CASK and lin-2 also contain an N-terminal calmodulin-dependent kinase (CaMK)-like domain and two L27 domains. MPP1 is ubiquitously-expressed and plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. CASK is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212968 Cd Length: 62 Bit Score: 42.80 E-value: 4.03e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1151 VIAMYDYIANNED-------ELNFSKGQLINVMNKDDPDWWQ----GEINGVTGLFPS 1197
Cdd:cd12035      2 VRAQFDYDPSKDDlipcqqaGIAFKTGDILQIISKDDHNWWQarkpGASKEPAGLIPS 59

Second Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212855 [Multi-domain] Cd Length: 58 Bit Score: 42.67 E-value: 4.10e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVKM 1202
Cdd:cd11922      2 EAIAKFNFNGDTQVEMSFRKGERITLLRQVDENWYEGRIPGTSrqGIFPITYVDV 56

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 42.63 E-value: 4.23e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVKL 1133
Cdd:cd11995      9 YTAQNDDELAFSKGQIINVLNKEDPDWWKGELNG-----QVGLFPSNYVKL 54

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 42.62 E-value: 4.24e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11894      3 KALYDYEGQTDDELSFPEGAIIRIlNKENQDDDGFWEGEFNGRIGVFPSVLVE 55

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 42.56 E-value: 4.32e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSN 1198
Cdd:cd12000      5 ALYDNKADCSDELAFRRGDILTVLEQNVPGsegWWKCLLHGRQGLAPAN 53

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 42.71 E-value: 4.32e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHG-GR----GWFPKSYVKI 972
Cdd:cd11839      2 AQVIAPFTATAENQLSLAVGQLVLVRKKSPSgWWEGELQArGKkrqiGWFPANYVKL 58

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 42.70 E-value: 4.32e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKML 838
Cdd:cd11963      5 RALYDFEAVEDNELTFKHGEIIIVLDDS--DANWWKGENHRGVGLFPSNFVTTDL 57

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 42.50 E-value: 4.33e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELqARGkkrQKGWFPASHV 1131
Cdd:cd11812      8 YTANRSDELTIHRGDIIRVLYKDNDNWWFGSL-VNG---QQGYFPANYV 52

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF16 and ARHGEF26; ARHGEF16, also called ephexin-4, acts as a GEF for RhoG, activating it by exchanging bound GDP for free GTP. RhoG is a small GTPase that is a crucial regulator of Rac in migrating cells. ARHGEF16 interacts directly with the ephrin receptor EphA2 and mediates cell migration and invasion in breast cancer cells by activating RhoG. ARHGEF26, also called SGEF (SH3 domain-containing guanine exchange factor), also activates RhoG. It is highly expressed in liver and may play a role in regulating membrane dynamics. ARHGEF16 and ARHGEF26 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212871 Cd Length: 55 Bit Score: 42.52 E-value: 4.37e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqaRGKKRQKGWFPASHVK 1132
Cdd:cd11938      3 EIIKAYTAKQPDELSLQQADVVLVLQTESDGWYYGE---RLRDGERGWFPSSCAK 54

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 42.64 E-value: 4.38e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIG--ERTGIFPSNYVR 1054
Cdd:cd11924      2 EAVAQYTFKGDLEVELSFRKGEHIcLIRKVNENWYEGRITgtGRQGIFPASYVQ 55

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 42.65 E-value: 4.48e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258  933 ENHLNFSKHDVITVL------EQQENWWFGEVHGGR-GWFPKSYVKI 972
Cdd:cd11771     14 EMELSLKKGDIVAVLsktdplGRDSEWWKGRTRDGRiGWFPSNYVEV 60

Atrophin-1 family; Atrophin-1 is the protein product of the dentatorubral-pallidoluysian atrophy (DRPLA) gene. DRPLA OMIM:125370 is a progressive neurodegenerative disorder. It is caused by the expansion of a CAG repeat in the DRPLA gene on chromosome 12p. This results in an extended polyglutamine region in atrophin-1, that is thought to confer toxicity to the protein, possibly through altering its interactions with other proteins. The expansion of a CAG repeat is also the underlying defect in six other neurodegenerative disorders, including Huntington's disease. One interaction of expanded polyglutamine repeats that is thought to be pathogenic is that with the short glutamine repeat in the transcriptional coactivator CREB binding protein, CBP. This interaction draws CBP away from its usual nuclear location to the expanded polyglutamine repeat protein aggregates that are characteriztic of the polyglutamine neurodegenerative disorders. This interferes with CBP-mediated transcription and causes cytotoxicity.

Pssm-ID: 460830 [Multi-domain] Cd Length: 991 Bit Score: 48.22 E-value: 4.54e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258   86 IKLKLQGQQLPVvlPPImkQPPMFSPLISARFGMGSMPNLSIHQPLPPVAPItAPLSSATSGtsiPPLMMPAPLVPSVST 165
Cdd:pfam03154  415 LQLMPQSQQLPP--PPA--QPPVLTQSQSLPPPAASHPPTSGLHQVPSQSPF-PQHPFVPGG---PPPITPPSGPPTSTS 486

                           90       100       110
                   ....*....|....*....|....*....|..
gi 1958785258  166 SSLPngtaSLIQPLSIPYSSS-TLPHASSYSL 196
Cdd:pfam03154  487 SAMP----GIQPPSSASVSSSgPVPAAVSCPL 514

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 42.62 E-value: 4.70e-05

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTGSIGERTGIFPSNYV 1053
Cdd:cd11976      4 ARYDFCARDRSELSLKEGDIIKILNKKGQqgWWRGEIYGRVGWFPANYV 52

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 42.32 E-value: 4.98e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WW-FGEVHGGRGWFPKSYVKI 972
Cdd:cd11904      4 QALYPFSSSNDEELNFEKGEVMDVIEKPENdpeWWkCRKANGQVGLVPKNYVTV 57

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 42.35 E-value: 5.04e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYG-SFQGKFGWFPCNYVEK 836
Cdd:cd11761      6 VLYSYEAQRPDELTITEGEELEVIEDGDGD-GWVKArNKSGEVGYVPENYLQF 57

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 42.37 E-value: 5.10e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvgEPG--WLYGSFQG-KFGWFPCNYVE 835
Cdd:cd11858      2 YKALYDFAGSVANELSLKKDDIVYIVQK---EDNgwWLAKKLDEsKEGWVPAAYLE 54

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 42.34 E-value: 5.14e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWF-GEVHGGRGWFPKSYV 970
Cdd:cd11796      1 QARVLQDLSAQLDEELDLREGDVVTITGILDKGWFrGELNGRRGIFPEGFV 51

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 42.72 E-value: 5.24e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDP---DWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12001      7 ALYDNVAESPDELSFRKGDIMTVLERDTQgldGWWLCSLHGRQGIVPGNRLKI 59

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 42.33 E-value: 5.34e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYGSFQ-GKFGWFPCNYV 834
Cdd:cd12007      3 FVALYDYEARTTEDLSFKKGERFQIINNTEGD-WWEARSIAtGKNGYIPSNYV 54

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 42.12 E-value: 5.36e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKdDPDWWQGE--INGVTGLFPSNYVKM 1202
Cdd:cd12005      1 LVVALYSYEPSHDGDLGFEKGEKLRILEQ-SGEWWKAQslTTGQEGFIPFNFVAK 54

Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk); TXK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal cysteine-rich region. Rlk is expressed in T-cells and mast cell lines, and is a key component of T-cell receptor (TCR) signaling. It is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212840 [Multi-domain] Cd Length: 55 Bit Score: 42.25 E-value: 5.88e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGS--IGERtGIFPSNYV 1053
Cdd:cd11907      4 KALYDFLPREPSNLALKRAEEYLILEQyDPHWWKARdrYGNE-GLIPSNYV 53

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 47.71 E-value: 5.90e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  486 QELERQRRLEWERIrrQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCD 565
Cdd:TIGR04523  415 KKLQQEKELLEKEI--ERLKETIIKNNSEIKDLTNQDSVKELIIKNLDNTRESLETQLKVLSRSINKIKQNLEQKQKELK 492

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  566 LEIMEIKQLQQELQEYQNKLIYLVPEKQLLNERIKNMqlsntpdsgisllhkkSSEKEElcqrlkeqldaLEKETASKLS 645
Cdd:TIGR04523  493 SKEKELKKLNEEKKELEEKVKDLTKKISSLKEKIEKL----------------ESEKKE-----------KESKISDLED 545

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  646 EMDSFNNQLKCGNMDDSVLQCLLSLLSclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKK-KLED 724
Cdd:TIGR04523  546 ELNKDDFELKKENLEKEIDEKNKEIEE--------LKQTQKSLKKKQEEKQELIDQKEKEKKDLIKEIEEKEKKIsSLEK 617

                          250       260       270
                   ....*....|....*....|....*....|....*....
gi 1958785258  725 EaARKAKqgKENLWKESIRKEEEEKQKRLQEEKSQDRTQ 763
Cdd:TIGR04523  618 E-LEKAK--KENEKLSSIIKNIKSKKNKLKQEVKQIKET 653

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 42.19 E-value: 5.94e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd12052      2 AIVEFDYKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGR-----RGLFPDNFVR 52

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 42.10 E-value: 6.04e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDD----PDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12141      4 AVYTFKARSPNELSVSANQRVRILEFSDltgnKEWWLAEANGQKGYVPSNYIR 56

Arginine and glutamate-rich 1; ARGLU, arginine and glutamate-rich 1 protein family, is required for the oestrogen-dependent expression of ESR1 target genes. It functions in cooperation with MED1. The family of proteins is found in eukaryotes.

Pssm-ID: 405931 [Multi-domain] Cd Length: 151 Bit Score: 44.66 E-value: 6.12e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  696 EQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWK-------ESIRKEEEEK-----QKRLQEEKSQDRTQ 763
Cdd:pfam15346   45 EARKIMEKQVLEELEREREAELEEERRKEEEERKKREELERILEennrkieEAQRKEAEERlamleEQRRMKEERQRREK 124

                           90
                   ....*....|.
gi 1958785258  764 EEERKTEAKQS 774
Cdd:pfam15346  125 EEEEREKREQQ 135

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 42.09 E-value: 6.15e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTG--SIGERtGIFPSNYVR 1054
Cdd:cd11962      3 VVLYDYEKDEDNEIELVEGEIVTnIEMVDEDWWMGtnSKGES-GLFPSNYVE 53

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 47.74 E-value: 6.25e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  399 QKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEerrkeierrescisfplmREREWISVYKDRKGFMAELwk 478
Cdd:TIGR02168  676 RREIEELEEKIEELEEKIAELEKALAELRKELEELEEELEQ------------------LRKELEELSRQISALRKDL-- 735

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  479 pgscaakQELERQRRLEWERIRRQELLNQKNREQEEIvrLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELE 558
Cdd:TIGR02168  736 -------ARLEAEVEQLEERIAQLSKELTELEAEIEE--LEERLEEAEEELAEAEAEIEELEAQIEQLKEELKALREALD 806

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  559 VLDKQCDLEIMEIKQLQQELQEYQNKLIYLVPEKQLLNERIKNMQLSntpdsgISLLHKKSSEKEELCQRLKEQLDALEK 638
Cdd:TIGR02168  807 ELRAELTLLNEEAANLRERLESLERRIAATERRLEDLEEQIEELSED------IESLAAEIEELEELIEELESELEALLN 880

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  639 ETASKLSEMDSFNNQLkcGNMDDSVLQCLLSLLSCLNnlflLLKELRESYNTQQLALEQLhKIKRD----KLKELERKRL 714
Cdd:TIGR02168  881 ERASLEEALALLRSEL--EELSEELRELESKRSELRR----ELEELREKLAQLELRLEGL-EVRIDnlqeRLSEEYSLTL 953

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  715 EQIQKKKLEDEAARKAKQGKENLWKESIRK----------EEEEKQKRLQEEKSQDRTQEEERKT 769
Cdd:TIGR02168  954 EEAEALENKIEDDEEEARRRLKRLENKIKElgpvnlaaieEYEELKERYDFLTAQKEDLTEAKET 1018

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 42.02 E-value: 6.50e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVKL 1133
Cdd:cd11840      8 YTAQNEDELSFQKGDIINVLSKDDPDWWRGELNG-----QTGLFPSNYVEP 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 42.02 E-value: 6.50e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11827      1 QCKALYAYDAQDTDELSFNEGDIIEILkEDPSGWWTGRLRGKEGLFPGNYV 51

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 42.11 E-value: 6.56e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVT--QKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11948      1 EAVALYSFQATESDELPFQKGDILKILnmEDDQNWYKAELQGREGYIPKNYIK 53

Src Homology 3 domain of Myosin XVb; Myosin XVb, also called KIAA1783, was named based on its similarity with myosin XVa. It is a transcribed and unprocessed pseudogene whose predicted amino acid sequence contains mutated or deleted amino acid residues that are normally conserved and important for myosin function. The related myosin XVa is important for normal growth of mechanosensory stereocilia of inner ear hair cells. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 213001 Cd Length: 55 Bit Score: 42.17 E-value: 6.72e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12068      4 ALRSYITDDKSLLSFHRGDLIKLLPMAGLEPGWQFGSTGGRSGLFPADIVQ 54

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 41.93 E-value: 6.86e-05

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELqarGKKRQKgWFPASHVK 1132
Cdd:cd11825      8 YRAQRPDELSFCKHAIITNVEKEDGGWWRGDY---GGKKQK-WFPANYVE 53

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing protein B; UBASH3B, also called Suppressor of T cell receptor Signaling (STS)-1 or T cell Ubiquitin LigAnd (TULA)-2 is an active phosphatase that is expressed ubiquitously. The phosphatase activity of UBASH3B is essential for its roles in the suppression of TCR signaling and the regulation of EGFR. It also interacts with Syk and functions as a negative regulator of platelet glycoprotein VI signaling. TULA proteins contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212869 Cd Length: 62 Bit Score: 42.33 E-value: 6.98e-05

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                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVD--EKTVGEPGWLYGSF--QGKFGWFPCNYVEK 836
Cdd:cd11936      5 QVIYPYTPQNDDELELVPGDYIFMSpmEQTSTSEGWIYGTSltTGCSGLLPENYITK 61

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 41.95 E-value: 7.16e-05

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11990      3 QALCSWTAKKDNHLNFSKNDIITVLEQ---QENWWFGEVHGGRGWFPKSYVK 51

Src Homology 3 (SH3) domain of Apoptosis Stimulating of p53 protein 2; ASPP2 is the full length form of the previously-identified tumor supressor, p53-binding protein 2 (p53BP2). ASPP2 activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). It plays a central role in regulating apoptosis and cell growth; ASPP2-deficient mice show postnatal death. Downregulated expression of ASPP2 is frequently found in breast tumors, lung cancer, and diffuse large B-cell lymphoma where it is correlated with a poor clinical outcome. ASPP2 contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP2 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212886 [Multi-domain] Cd Length: 57 Bit Score: 41.86 E-value: 7.19e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPD---WWQGEINGVTGLFPSN 1198
Cdd:cd11953      3 VYALWDYEGESDDELSFKEGDCMTILRREDEDeteWWWARLNDKEGYVPRN 53

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 41.84 E-value: 7.26e-05

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                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNY 833
Cdd:cd11952      5 ALWDYSAEFPDELSFKEGDMVTVLRKDGEGTDWWWASLCGREGYVPRNY 53

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 41.94 E-value: 7.40e-05

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                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1009 YSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSIGERTGIFPSNYV 1053
Cdd:cd11901      8 FNYTAEREDELSLVKGTKVIVMEKcsDG-WWRGSYNGQVGWFPSNYV 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 41.90 E-value: 7.53e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLI-NVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12065      4 AVYPCEAEHSSELSFEVGAIFeDVTLSREPGWLEGTLNGKRGLIPENYVEI 54

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 41.94 E-value: 7.59e-05

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVK 1132
Cdd:cd12076      5 VIYPYTARDQDEINLEKGAVVEVIQKNLEGWWKIRYQG-----KEGWAPASYLK 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212856 [Multi-domain] Cd Length: 57 Bit Score: 41.83 E-value: 7.74e-05

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                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVKM 1202
Cdd:cd11923      2 EAVAKYNFNADTNVELSLRKGDRVVLLKQVDQNWYEGKIPGTNrqGIFPVSYVEV 56

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 41.91 E-value: 7.76e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPSNYV 1200
Cdd:cd11925      4 LALYAYKPQKNDELELRKGEMYRVIEKCQDGWFKGTSlrTGVSGVFPGNYV 54

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 41.45 E-value: 7.88e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:pfam14604    4 PYEPKDDDELSLQRGDVITVIEESEDGWWEGINTGR-----TGLVPANYVE 49

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 41.91 E-value: 8.09e-05

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                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1002 GEEYIALYSYSSVEPGDLTFTEGEELLVTQ--KDGEWWTG--SIGeRTGIFPSNYV 1053
Cdd:cd11769      1 GTECIAKYNFNGASEEDLPFKKGDILTIVAvtKDPNWYKAknKDG-REGMIPANYV 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 41.86 E-value: 8.37e-05

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTGSI-GERTGIFPSNYVRP 1055
Cdd:cd11998      5 ALYDYDGQEQDELSFKAGDELTKLEDEDEqgWCKGRLdSGQVGLYPANYVEP 56

First Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The first SH3 domain of Nck proteins preferentially binds the PxxDY sequence, which is present in the CD3e cytoplasmic tail. This binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212699 [Multi-domain] Cd Length: 51 Bit Score: 41.63 E-value: 8.61e-05

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                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNkDDPDWWQGE-INGVTGLFPSNYV 1200
Cdd:cd11765      2 VVAKYDYTAQGDQELSIKKNEKLTLLD-DSKHWWKVQnSSNQTGYVPSNYV 51

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 41.81 E-value: 8.67e-05

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                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQ---ENWWFGEVHGGRGWFPKSYVKII 973
Cdd:cd12057      3 KVLFPYEAQNEDELTIKEGDIVTLISKDcidAGWWEGELNGRRGVFPDNFVKLL 56

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 41.53 E-value: 8.93e-05

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                   ....*....|....*....|....*....|....*....|....*
gi 1958785258  927 SWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11902      8 AYVAEREDELSLVKGSRVTVMEKcSDGWWRGSYNGQIGWFPSNYV 52

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 41.45 E-value: 9.54e-05

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                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd11921      5 LKFDFQAQSPKELTLQKGDIVYIHKEVDKNWLEGEHHGRVGIFPANYVEV 54

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 41.87 E-value: 9.58e-05

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                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1002 GEEYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGsIGERT---GIFPSNYVRP 1055
Cdd:cd11918      1 RTPYKAVYQYRPQNEDELELREGDRVDVMQQcDDGWFVG-VSRRTqkfGTFPGNYVAP 57

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 41.90 E-value: 9.69e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRG-WFPKSYVKII 973
Cdd:cd11970      7 KALFDYKAQREDELTFTKNAIIQNVEKQEgGWWRGDYGGKKQlWFPSNYVEEI 59

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 41.60 E-value: 9.75e-05

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWqgeLQARGKKRQKGWFPASHVKL 1133
Cdd:cd11858      8 FAGSVANELSLKKDDIVYIVQKEDNGWW---LAKKLDESKEGWVPAAYLEE 55

Second C-terminal Src homology 3 domain of Rho guanine nucleotide exchange factor 37; ARHGEF37 contains a RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. Its specific function is unknown. Its domain architecture is similar to the C-terminal half of DNMBP or Tuba, a cdc42-specific GEF that provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics, and plays an important role in regulating cell junction configuration. GEFs activate small GTPases by exchanging bound GDP for free GTP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212874 Cd Length: 57 Bit Score: 41.44 E-value: 1.00e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDD----PDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11941      1 QVVAAYPFTARSKHEVSLQAGQPVTVLEPHDkkgsPEWSLVEVNGQRGYVPSSYL 55

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 41.54 E-value: 1.03e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd11826      7 DYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGV-----TGLFPGNYV 51

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 46.98 E-value: 1.05e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  348 YQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQ----QQREAERKAQKEKEEWERKQRELQEQEWKKQLEL 423
Cdd:PRK03918   233 LEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEieelEEKVKELKELKEKAEEYIKLSEFYEEYLDELREI 312

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  424 EKRLEK---------QRELERQREEERRKEIERRESCISFPLMREREWISVYKDRKGFMAELWKPGSCAAKQELER-QRR 493
Cdd:PRK03918   313 EKRLSRleeeingieERIKELEEKEERLEELKKKLKELEKRLEELEERHELYEEAKAKKEELERLKKRLTGLTPEKlEKE 392

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  494 LEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQ--ISGRLQDVRIRKQTQKT---ELEVLDKqcdlEI 568
Cdd:PRK03918   393 LEELEKAKEEIEEEISKITARIGELKKEIKELKKAIEELKKAKGKcpVCGRELTEEHRKELLEEytaELKRIEK----EL 468

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  569 MEIKQLQQELQEYQNKL-IYLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKET---ASKL 644
Cdd:PRK03918   469 KEIEEKERKLRKELRELeKVLKKESELIKLKELAEQLKELEEKLKKYNLEELEKKAEEYEKLKEKLIKLKGEIkslKKEL 548

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  645 SEMDSFNNQLKcgnmddsvlqcllsllsclnnlfLLLKELRESyntqQLALEQLHKIKRDK----LKELER--KRLEQIQ 718
Cdd:PRK03918   549 EKLEELKKKLA-----------------------ELEKKLDEL----EEELAELLKELEELgfesVEELEErlKELEPFY 601

                          410       420       430       440       450       460
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  719 KKKLEdeaARKAKQGKEnlwkesiRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARALVNY 783
Cdd:PRK03918   602 NEYLE---LKDAEKELE-------REEKELKKLEEELDKAFEELAETEKRLEELRKELEELEKKY 656

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 1, also called Insulin Receptor Tyrosine Kinase Substrate (IRTKS); BAIAP2L1 or IRTKS is widely expressed, serves as a substrate for the insulin receptor, and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. BAIAP2L1 expression leads to the formation of short actin bundles, distinct from filopodia-like protrusions induced by the expression of the related protein IRSp53. IRTKS mediates the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRTKS has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212846 Cd Length: 58 Bit Score: 41.44 E-value: 1.07e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958785258  936 LNFSKHDVITVL--EQQENWWFGE--VHGGRGWFPKSYVK 971
Cdd:cd11913     18 LSFAQGDVITLLipEEKDGWLYGEhdTTKARGWFPSSYTR 57

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 47.27 E-value: 1.08e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  382 RRQVLM-EQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEIERRESCISFPLMRER 460
Cdd:TIGR00618  220 RKQVLEkELKHLREALQQTQQSHAYLTQKREAQEEQLKKQQLLKQLRARIEELRAQEAVLEETQERINRARKAAPLAAHI 299

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  461 EWIS-VYKDRKGFMAEL------------WKPGSCAAKQELERQRRLEWERIRRQELLNQKNREQEEIVRLNSKKKSL-- 525
Cdd:TIGR00618  300 KAVTqIEQQAQRIHTELqskmrsrakllmKRAAHVKQQSSIEEQRRLLQTLHSQEIHIRDAHEVATSIREISCQQHTLtq 379

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  526 HL-----ELEAVNGKHQQISGRLQDVRIRKQTQKTE----------LEVLDKQCDLE--IMEIKQLQQELQEYQNKL--I 586
Cdd:TIGR00618  380 HIhtlqqQKTTLTQKLQSLCKELDILQREQATIDTRtsafrdlqgqLAHAKKQQELQqrYAELCAAAITCTAQCEKLekI 459

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  587 YLVPEKQLLNERIKNMQLSNTpdsgislLHKKSSEKEELCQRLKEQLDALEKETASKLSE-----MDSFN---NQLKCGN 658
Cdd:TIGR00618  460 HLQESAQSLKEREQQLQTKEQ-------IHLQETRKKAVVLARLLELQEEPCPLCGSCIHpnparQDIDNpgpLTRRMQR 532

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  659 MDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHK--IKRDKLKELE---RKRLEQIQ---------KKKLED 724
Cdd:TIGR00618  533 GEQTYAQLETSEEDVYHQLTSERKQRASLKEQMQEIQQSFSIltQCDNRSKEDIpnlQNITVRLQdlteklseaEDMLAC 612

                          410       420       430       440       450       460       470       480
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  725 EAARKAKQGKENLWKESIRKEEEEKQKRLQ------------------EEKSQDRTQEEERKTEAKQSETARALVNYRAL 786
Cdd:TIGR00618  613 EQHALLRKLQPEQDLQDVRLHLQQCSQELAlkltalhalqltltqervREHALSIRVLPKELLASRQLALQKMQSEKEQL 692


                   ..
gi 1958785258  787 YP 788
Cdd:TIGR00618  693 TY 694

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 41.52 E-value: 1.10e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSiGERT---GIFPSNYVRP 1055
Cdd:cd11780      2 YRALYSYTPQNEDELELREGDIVYVMEKcdDG-WFVGT-SERTglfGTFPGNYVAR 55

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 41.19 E-value: 1.14e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd11758      4 RALFDFPGNDDEDLPFKKGEILTVIRKP-EEQWWNARNSEGKTGMIPVPYVEK 55

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 41.32 E-value: 1.19e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGE-VHGGRGWFPKSYVKI 972
Cdd:cd11962      1 RAVVLYDYEKDEDNEIELVEGEIVTNIEMvDEDWWMGTnSKGESGLFPSNYVEL 54

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 41.41 E-value: 1.26e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSsGWWQGELQarGKKRQKGWFPASHVKL 1133
Cdd:cd11872      8 FQGDGEHQLSLQVGDTVQILEECE-GWYRGFSL--RNKSLKGIFPKSYVHI 55

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 41.29 E-value: 1.27e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSS-----GWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd12059      8 YEASAEDELTLRRGDRVEVLSKDSAvsgdeGWWTGKINDR-----VGIFPSNYV 56

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 40.94 E-value: 1.31e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12046      4 ALFSYEASQPEDLEFQKGDVILVLSKvNEDWLEGQCKGKIGIFPSAFVE 52

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 43.88 E-value: 1.35e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  696 EQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSE 775
Cdd:pfam05672   33 ERLEKEEEERLRKEELRRRAEEERARREEEARRLEEERRREEEERQRKAEEEAEEREQREQEEQERLQKQKEEAEAKARE 112


                   ..
gi 1958785258  776 TA 777
Cdd:pfam05672  113 EA 114

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 41.15 E-value: 1.37e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGK---FGWFPCNY 833
Cdd:cd11821      3 RALYDCQADNDDELTFSEGEIIVVTGE--EDDEWWEGHIEGDpsrRGVFPVSF 53

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 41.13 E-value: 1.38e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258 1148 VCQVIamYDYIANNEDELNFSKGQLINVMNKD---DPDWWQGEIN---GVTGLFPSNYV 1200
Cdd:cd11791      1 VLRVL--YPYTPQEEDELELVPGDYIYVSPEEldsSSDGWVEGTSwltGCSGLLPENYT 57

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 41.18 E-value: 1.42e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNS--SGWWQGELQARgkkrqKGWFPASHVKL 1133
Cdd:cd11875      2 ARVLFDYEAENEDELTLREGDIVTILSKDCedKGWWKGELNGK-----RGVFPDNFVEP 55

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 46.40 E-value: 1.43e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  484 AKQELERQRRLEwERIRRQELLNQKNreQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIR------KQTQKTEL 557
Cdd:pfam02029   69 AKREERRQKRLQ-EALERQKEFDPTI--ADEKESVAERKENNEEEENSSWEKEEKRDSRLGRYKEEeteireKEYQENKW 145

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  558 EVLDKQCDLEIMEikqlqqelqeyqnkliylVPEKQLLNERIKnmqlsntpdsgisllhKKSSEKEELCQRLKEQLDALE 637
Cdd:pfam02029  146 STEVRQAEEEGEE------------------EEDKSEEAEEVP----------------TENFAKEEVKDEKIKKEKKVK 191

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  638 KETASKLSEMDSFNNQlKCGNMDDSVLQCLLSLLSCLNNlfLLLKELRESYNTQQLALEQ-LHKIKRdKLKELERKRLEQ 716
Cdd:pfam02029  192 YESKVFLDQKRGHPEV-KSQNGEEEVTKLKVTTKRRQGG--LSQSQEREEEAEVFLEAEQkLEELRR-RRQEKESEEFEK 267

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  717 IQKKKLE-----DEAARKAKQGKENLWKESIRKEEEEKQK--RLQEEKSQDRTQEEERKTEA 771
Cdd:pfam02029  268 LRQKQQEaelelEELKKKREERRKLLEEEEQRRKQEEAERklREEEEKRRMKEEIERRRAEA 329

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 40.81 E-value: 1.51e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1003 EEYIALYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTG--SIGeRTGIFPSNYV 1053
Cdd:cd11758      1 EYVRALFDFPGNDDEDLPFKKGEILTVIRKPEEqWWNArnSEG-KTGMIPVPYV 53

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 41.16 E-value: 1.54e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKML 838
Cdd:cd11971      4 AIYDYSKDKDDELSFMEGAIIYVIKKN--DDGWYEGVCNGVTGLFPGNYVESIM 55

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 46.67 E-value: 1.55e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  353 EEEPQKKLPVTFEDKRKAnyergnmELEKRRQvlmEQQQREAERKAQKEKEEWE-RKQRELQEQEWKKQLELEKRLEKQR 431
Cdd:PTZ00121  1149 EDAKRVEIARKAEDARKA-------EEARKAE---DAKKAEAARKAEEVRKAEElRKAEDARKAEAARKAEEERKAEEAR 1218

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  432 ELERQREEERRKEIERREScisfplmREREWISVYKDRKGfmAELWKPGSCAAKQELERQRRLEWERIRRQELLN--QKN 509
Cdd:PTZ00121  1219 KAEDAKKAEAVKKAEEAKK-------DAEEAKKAEEERNN--EEIRKFEEARMAHFARRQAAIKAEEARKADELKkaEEK 1289

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  510 REQEEIVRLNSKKKSLHLELEA--------VNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCDLEIMEIKQLQQELQEY 581
Cdd:PTZ00121  1290 KKADEAKKAEEKKKADEAKKKAeeakkadeAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAA 1369

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  582 QNKliyLVPEKQLLNERIKNMQLSNTPDSgislLHKKSSEKEELCQRLKEQLDALEK-ETASKLSEMDSFNNQLKCGNMD 660
Cdd:PTZ00121  1370 EKK---KEEAKKKADAAKKKAEEKKKADE----AKKKAEEDKKKADELKKAAAAKKKaDEAKKKAEEKKKADEAKKKAEE 1442

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  661 DSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLK---ELERKRLEQIQKKKLEDEAARKAKQGKENL 737
Cdd:PTZ00121  1443 AKKADEAKKKAEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEAKkkaEEAKKKADEAKKAAEAKKKADEAKKAEEAK 1522

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258  738 WKESIRKEEEEKQ----KRLQEEKSQD--------RTQEEERKTEAKQSETARALVNYR 784
Cdd:PTZ00121  1523 KADEAKKAEEAKKadeaKKAEEKKKADelkkaeelKKAEEKKKAEEAKKAEEDKNMALR 1581

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 41.16 E-value: 1.55e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11971      3 VAIYDYSKDKDDELSFMEGAIIYVIKKnDDGWYEGVCNGVTGLFPGNYV 51

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 40.88 E-value: 1.60e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVdeKTVGEPGWLYGSFQGKFGWFP 830
Cdd:cd11832      2 FIAVKSYSPQEEGEISLHKGDRVKV--LSIGEGGFWEGSVRGRTGWFP 47

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 41.16 E-value: 1.61e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1076 IAQVTSAYAASGAEQLSLAPGQLILI-LKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd11978      2 IAIARYDFCARDMRELSLLKGDVVKIyTKMSTNGWWRGEVNGR-----VGWFPSTYVE 54

Src Homology 3 domain of Interleukin-2-inducible T-cell Kinase; ITK (also known as Tsk or Emt) is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. ITK is expressed in T-cells and mast cells, and is important in their development and differentiation. Of the three Tec kinases expressed in T-cells, ITK plays the predominant role in T-cell receptor (TCR) signaling. It is activated by phosphorylation upon TCR crosslinking and is involved in the pathway resulting in phospholipase C-gamma1 activation and actin polymerization. It also plays a role in the downstream signaling of the T-cell costimulatory receptor CD28, the T-cell surface receptor CD2, and the chemokine receptor CXCR4. In addition, ITK is crucial for the development of T-helper(Th)2 effector responses. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212841 [Multi-domain] Cd Length: 56 Bit Score: 41.15 E-value: 1.64e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQ-GEINGVTGLFPSNYV 1200
Cdd:cd11908      3 VIALYDYQTNDPQELALRYNEEYHLLDSSEIHWWRvQDKNGHEGYVPSSYL 53

Pleckstrin homology domain-containing family G member 5 and 6 pleckstrin homology (PH) domain; PLEKHG5 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG5 activates the nuclear factor kappa B (NFKB1) signaling pathway. Mutations in PLEKHG5 are associated with autosomal recessive distal spinal muscular atrophy. PLEKHG6 (also called MyoGEF) has no known function to date. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270064 Cd Length: 100 Bit Score: 42.21 E-value: 1.75e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1452 RKLLYSG--KLYKTKSNK-ELHGFLFNDFLLLTylvRQfaassgfeklfSSKSSAQFKMYKTPIFLNEVLVKLPTDPSSd 1528
Cdd:cd13244      1 RRLLLEGdlRLKEGKGSKvDVHCFLFTDMLLIC---KP-----------VKRKKDRLKVIRPPYLVDKLVVQELKDPGG- 65

                           90       100       110
                   ....*....|....*....|....*....|....*..
gi 1958785258 1529 epvFHISHIDR------VYTLRTDNINERTAWVQKIK 1559
Cdd:cd13244     66 ---FLLVYLNEfhtavaAYTFQTSSQEDTRRWLDAIR 99

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 46.50 E-value: 1.75e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  336 KQIDSINGTLPSYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERK------Q 409
Cdd:pfam02463  278 EKEKKLQEEELKLLAKEEEELKSELLKLERRKVDDEEKLKESEKEKKKAEKELKKEKEEIEELEKELKELEIKreaeeeE 357

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  410 RELQEQEWKKQLELEKRLEKQRELERQREEERRKEIERRESCISFPLMREREWISVYKDRKGFMAELWKPGSCAAKQELE 489
Cdd:pfam02463  358 EEELEKLQEKLEQLEEELLAKKKLESERLSSAAKLKEEELELKSEEEKEAQLLLELARQLEDLLKEEKKEELEILEEEEE 437

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  490 RQR------RLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEA---------------------------VNGKH 536
Cdd:pfam02463  438 SIElkqgklTEEKEELEKQELKLLKDELELKKSEDLLKETQLVKLQEQlelllsrqkleersqkeskarsglkvlLALIK 517

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  537 QQISGRLQDVRIRKQTQKTELEVLD-KQCDLEIMEIKQLQQELQEYQNKLIYLVPEKQLLNERIKNMQLSNTPDSGISLL 615
Cdd:pfam02463  518 DGVGGRIISAHGRLGDLGVAVENYKvAISTAVIVEVSATADEVEERQKLVRALTELPLGARKLRLLIPKLKLPLKSIAVL 597

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  616 H---------KKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELRE 686
Cdd:pfam02463  598 EidpilnlaqLDKATLEADEDDKRAKVVEGILKDTELTKLKESAKAKESGLRKGVSLEEGLAEKSEVKASLSELTKELLE 677

                          410       420       430       440       450       460       470       480
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  687 SYNTQQLALEQLHKIK---RDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLwKESIRKEEEEKQKRLQEEKSQDRTQ 763
Cdd:pfam02463  678 IQELQEKAESELAKEEilrRQLEIKKKEQREKEELKKLKLEAEELLADRVQEAQ-DKINEELKLLKQKIDEEEEEEEKSR 756

                          490
                   ....*....|..
gi 1958785258  764 EEERKTEAKQSE 775
Cdd:pfam02463  757 LKKEEKEEEKSE 768

Src homology 3 domain of Endophilin-B; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain two endophilin-B isoforms. Endophilin-B proteins are cytoplasmic proteins expressed mainly in the heart, placenta, and skeletal muscle. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212736 [Multi-domain] Cd Length: 52 Bit Score: 40.73 E-value: 1.80e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSY 969
Cdd:cd11802      1 KARVLYDYDAEDSTELSLLADEVITVYElpgMDEDYMMGERGSQRGKVPVAY 52

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 40.80 E-value: 1.82e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11804      2 AVAKHDFKATAEDELSFKKGSILKVLnmEDDPNWYKAELDGKEGLIPKNYI 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 40.77 E-value: 1.82e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  782 NYRALYPFEARNHDEMSFNSGDIIQVdeKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11982      2 TFMAVKPYQSQAEGEISLSKGEKIKV--LSVGEGGFWEGQVKGRVGWFPSDCV 52

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 40.72 E-value: 1.84e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1089 EQLSLAPGQLILILKK-----NSSGWWQGelqaRGKKRQKGWFPASHV 1131
Cdd:cd11771     15 MELSLKKGDIVAVLSKtdplgRDSEWWKG----RTRDGRIGWFPSNYV 58

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 40.82 E-value: 1.86e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd12061      8 FQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGR-----TGWFPSNYVR 52

First Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the first SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213008 Cd Length: 55 Bit Score: 40.83 E-value: 1.87e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWqgelqARGKKRQKGWFPAS 1129
Cdd:cd12075      5 VVANYQKQESSEISLYVGQVVDIIEKNESGWW-----FVSTADEQGWVPAT 50

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 40.96 E-value: 1.88e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSS-----GWWQGELQARgkkrqKGWFPASHV 1131
Cdd:cd11876      8 YDARGEDELTLRRGQPVEVLSKDAAvsgdeGWWTGKIGDK-----VGIFPSNYV 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 40.74 E-value: 1.91e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKII 973
Cdd:cd12002      2 ARALYDNVPECAEELAFRKGDILTVIEQNtgglEGWWLCSLHGRQGIAPGNRLKLL 57

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 40.75 E-value: 2.01e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMnKDDPDWWQGE--INGVTGLFPSNYV 1200
Cdd:cd12004      2 VVALYPYDGIHEDDLSFKKGEKLKVI-EEHGEWWKARslTTKKEGFIPSNYV 52

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 40.59 E-value: 2.01e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11956      2 VEAVACFDYTGRTAQELSFKRGDVLLLHSKaSSDWWRGEHNGMRGLIPHKYISV 55

NIMA-related protein kinase; Provisional

Pssm-ID: 173502 [Multi-domain] Cd Length: 1021 Bit Score: 46.27 E-value: 2.03e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  686 ESYNTQQLALE-------QLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQeeks 758
Cdd:PTZ00266   441 EKENAHRKALEmkilekkRIERLEREERERLERERMERIERERLERERLERERLERDRLERDRLDRLERERVDRLE---- 516

                           90
                   ....*....|.
gi 1958785258  759 QDRTQEEERKT 769
Cdd:PTZ00266   517 RDRLEKARRNS 527

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 40.47 E-value: 2.08e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11816      3 VARFDFEGEQEDELSFSEGDVItLKEYVGEEWAKGELNGKIGIFPLNFV 51

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 40.39 E-value: 2.09e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWqgelqaRGKKRQK-GWFPASHVKL 1133
Cdd:cd11874      2 CKVLFSYTPQNEDELELKVGDTIEVLGEVEEGWW------EGKLNGKvGVFPSNFVKE 53

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 40.59 E-value: 2.10e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGelQARGKkrqKGWFPASHVKLL 1134
Cdd:cd12073      9 YQGEGDDEISFDPQETITDIEMVDEGWWKG--TCHGH---RGLFPANYVELL 55

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 40.81 E-value: 2.16e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLY-GSFQGKFGWFPCNYV 834
Cdd:cd11903      4 QTLYPFSSVTEEELNFEKGETMEVIEKPENDPEWWKcKNSRGQVGLVPKNYV 55

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 45.78 E-value: 2.25e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  501 RQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQD-----VRIRK---------QTQKTELEVLDKQCDL 566
Cdd:TIGR04523  227 NNQLKDNIEKKQQEINEKTTEISNTQTQLNQLKDEQNKIKKQLSEkqkelEQNNKkikelekqlNQLKSEISDLNNQKEQ 306

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  567 EIMeiKQLQQELQEYQNKLIylvpekQLLNERIKNMQLSNTPDSGISLLHK----KSSEKEELCQRLKE---QLDALEKE 639
Cdd:TIGR04523  307 DWN--KELKSELKNQEKKLE------EIQNQISQNNKIISQLNEQISQLKKeltnSESENSEKQRELEEkqnEIEKLKKE 378

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  640 TASKLSEMDS-----------FNNQLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKE 708
Cdd:TIGR04523  379 NQSYKQEIKNlesqindleskIQNQEKLNQQKDEQIKKLQQEKELLEKEIERLKETIIKNNSEIKDLTNQDSVKELIIKN 458

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  709 LERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEE------------EKQKRLQEEKSQDRTQEEERKTEAKQSET 776
Cdd:TIGR04523  459 LDNTRESLETQLKVLSRSINKIKQNLEQKQKELKSKEKElkklneekkeleEKVKDLTKKISSLKEKIEKLESEKKEKES 538

PAT complex subunit CCDC47; This family represents CCDC47 proteins which are a component of the PAT complex, an endoplasmic reticulum (ER)-resident membrane multiprotein complex that facilitates multi-pass membrane proteins insertion into membranes. The PAT complex, formed by CCDC47 and Asterix proteins, acts as an intramembrane chaperone by directly interacting with nascent transmembrane domains (TMDs), releasing its substrates upon correct folding, and is needed for optimal biogenesis of multi-pass membrane proteins. CCDC47 is required to maintain the stability of Asterix. CCDC47 is associated with various membrane-associated processes and is component of a ribosome-associated ER translocon complex involved in multi-pass membrane protein transport into the ER membrane and biogenesis. It is also involved in the regulation of calcium ion homeostasis in the ER, being also required for proper protein degradation via the ERAD (ER-associated degradation) pathway.

Pssm-ID: 462322 Cd Length: 323 Bit Score: 45.25 E-value: 2.34e-04

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  365 EDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKrlEKQ 430
Cdd:pfam07946  257 EALKKAKKTREEEIEKIKKAAEEERAEEAQEKKEEAKKKEREEKLAKLSPEEQRKYEEKER--KKE 320

Src Homology 3 domain of Membrane Protein, Palmitoylated 2 (or MAGUK p55 subfamily member 2); MPP2 is a scaffolding protein that interacts with the non-receptor tyrosine kinase c-Src in epithelial cells to negatively regulate its activity and morphological function. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212970 Cd Length: 59 Bit Score: 40.71 E-value: 2.35e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1151 VIAMYDY-------IANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPS 1197
Cdd:cd12037      2 VKCHFDYdpssdslIPCKEAGLKFRAGDLLQIVNQEDPNWWQACHveGGSAGLIPS 57

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 40.11 E-value: 2.57e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPS 1197
Cdd:cd11832      1 YFIAVKSYSPQEEGEISLHKGDRVKVLSIGEGGFWEGSVRGRTGWFPS 48

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 40.39 E-value: 2.58e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE----WWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11884      3 VAVRAYITRDQTLLSFHKGDVIKLLPKEGPldpgWLFGTLDGRSGAFPKEYVQP 56

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 40.15 E-value: 2.62e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSY 969
Cdd:cd11817      2 AVALYDFTGETEEDLSFQRGDRILVTEHLDaEWSRGRLNGREGIFPRAF 50

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 40.43 E-value: 2.68e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1008 LYSYSSVEPGDLTFTEGEELLVTQK---DGEWW--TGSIGErTGIFPSNYV 1053
Cdd:cd11903      6 LYPFSSVTEEELNFEKGETMEVIEKpenDPEWWkcKNSRGQ-VGLVPKNYV 55

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 40.14 E-value: 2.69e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11785      2 YRVIVPYPPQSEAELELKEGDIVFVHKKR--EDGWFKGTLQrtGKTGLFPGSFVES 55

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 45.83 E-value: 2.76e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  367 KRKANYERGNMELEKRRQ------VLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQReee 440
Cdd:PRK03918   345 KKLKELEKRLEELEERHElyeeakAKKEELERLKKRLTGLTPEKLEKELEELEKAKEEIEEEISKITARIGELKKEI--- 421

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  441 rrkeierrescisfplmrerewisvyKDRKGFMAELWKP-GSC-AAKQELERQRRLEWERIRRQELlnqkNREQEEIVRL 518
Cdd:PRK03918   422 --------------------------KELKKAIEELKKAkGKCpVCGRELTEEHRKELLEEYTAEL----KRIEKELKEI 471

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  519 NSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVldKQCDLEimEIKQLQQELQEYQNKLIYLVPEKQLLNER 598
Cdd:PRK03918   472 EEKERKLRKELRELEKVLKKESELIKLKELAEQLKELEEKL--KKYNLE--ELEKKAEEYEKLKEKLIKLKGEIKSLKKE 547

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  599 IKNMQ-LSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDDSVLQCllsllsclnnl 677
Cdd:PRK03918   548 LEKLEeLKKKLAELEKKLDELEEELAELLKELEELGFESVEELEERLKELEPFYNEYLELKDAEKELER----------- 616

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  678 flLLKELRESYNTQQLALEQLHKIKRDkLKELeRKRLEQIQKKKLEDEAARKAKQgKENLWKE--SIRKEEEEKQKRLQE 755
Cdd:PRK03918   617 --EEKELKKLEEELDKAFEELAETEKR-LEEL-RKELEELEKKYSEEEYEELREE-YLELSRElaGLRAELEELEKRREE 691

                          410       420
                   ....*....|....*....|.
gi 1958785258  756 -EKSQDRTQEEERKTEAKQSE 775
Cdd:PRK03918   692 iKKTLEKLKEELEEREKAKKE 712

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 40.39 E-value: 2.77e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQ--ENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11978      3 AIARYDFCARDMRELSLLKGDVVKIYTKMstNGWWRGEVNGRVGWFPSTYVE 54

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 40.10 E-value: 2.80e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVdeKTVGEPGWLYGSFQGKFGWFP 830
Cdd:cd11797      4 ALYRFQALEPNELDFEVGDRIRI--IATLEDGWLEGELKGRRGIFP 47

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 40.33 E-value: 2.81e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGE--PGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd11895      3 RALYSYTGQSPEELSFPEGALIRLLPRAQDGvdDGFWRGEFGGRVGVFPSLLVEEL 58

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 40.37 E-value: 2.82e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....
gi 1958785258 1089 EQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd12060     16 DELSVCKGDIIYVTRVEEGGWWEGTLNGK-----TGWFPSNYVR 54

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 40.31 E-value: 2.85e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11929      4 KALCNYRGHNPGDLKFNKGDVIllrrQLDEN------WYLGEINGVSGIFPASSVE 53

Ca2+-binding protein, EF-hand superfamily [Signal transduction mechanisms];

Pssm-ID: 444056 [Multi-domain] Cd Length: 137 Bit Score: 42.47 E-value: 2.88e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 1958785258  250 RQKFNSLDKSMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMH 308
Cdd:COG5126     72 RAAFDLLDTDGDGKISADEFRRLLTALGVSEEEADELFARLDTDGDGKISFEEFVAAVR 130

RIM-binding protein of the cytomatrix active zone; This is a family of proteins that form part of the CAZ (cytomatrix at the active zone) complex which is involved in determining the site of synaptic vesicle fusion. The C-terminus is a PDZ-binding motif that binds directly to RIM (a small G protein Rab-3A effector). The family also contains four coiled-coil domains.

Pssm-ID: 431111 [Multi-domain] Cd Length: 766 Bit Score: 45.58 E-value: 2.88e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  591 EKQL--LNERIKNMQL-SNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKEtasKLSEMDSFNNQLKCGNMDDSVLQCL 667
Cdd:pfam10174  414 DKQLagLKERVKSLQTdSSNTDTALTTLEEALSEKERIIERLKEQREREDRE---RLEELESLKKENKDLKEKVSALQPE 490

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  668 LSLLSCLnnlfllLKELREsyNTQQLALEQLHKIKRDKLKELErkrleqIQKKKleDEAARKAKQGKENLWKESIRKEEE 747
Cdd:pfam10174  491 LTEKESS------LIDLKE--HASSLASSGLKKDSKLKSLEIA------VEQKK--EECSKLENQLKKAHNAEEAVRTNP 554

                          170       180       190
                   ....*....|....*....|....*....|....
gi 1958785258  748 EKQKRLQE-EKSQDRTQEEERKTeakQSETARAL 780
Cdd:pfam10174  555 EINDRIRLlEQEVARYKEESGKA---QAEVERLL 585

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 40.04 E-value: 2.94e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258 1078 QVTSAYA--ASGAEQLSLAPGQLILILKKNSSgWWQGELQargkKRQKGWFPASHVKL 1133
Cdd:cd11837      1 TATALYPwrAKKENHLSFAKGDIITVLEQQEM-WWFGELE----GGEEGWFPKSYVKE 53

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing protein A; UBASH3A is also called Cbl-Interacting Protein 4 (CLIP4), T cell Ubiquitin LigAnd (TULA), or T cell receptor Signaling (STS)-2. It is only found in lymphoid cells and exhibits weak phosphatase activity. UBASH3A facilitates T cell-induced apoptosis through interaction with the apoptosis-inducing factor AIF. It is involved in regulating the level of phosphorylation of the zeta-associated protein (ZAP)-70 tyrosine kinase. TULA proteins contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212870 [Multi-domain] Cd Length: 60 Bit Score: 40.39 E-value: 2.97e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVD--EKTVGEPGWLYGSFQ--GKFGWFPCNYVEK 836
Cdd:cd11937      4 RALFQYKPQNIDELMLSPGDYIFVDptQQSEASEGWVIGISHrtGCRGFLPENYTER 60

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 39.98 E-value: 3.00e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12055      3 QVAFSYLPQNEDELELKVGDIIEVVGEV--EEGWWEGVLNGKTGMFPSNFIKE 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 40.33 E-value: 3.05e-04

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  913 QGQAVENLKAQALcswtakKEnhLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKII 973
Cdd:cd11919      2 PARAKFDFKAQTL------KE--LPLQKGDIVYIYKQiDQNWYEGEHHGRVGIFPRSYIELL 55

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 40.34 E-value: 3.07e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYV 834
Cdd:cd11926      2 YVAIYPYTPRKEDELELRKGEMFLVFERC--QDGWFKGTsmHTSKIGVFPGNYV 53

Src Homology 3 domain of Sorting nexin 18; SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. It binds FIP5 and is required for apical lumen formation. It may also play a role in axonal elongation. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX18 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212830 [Multi-domain] Cd Length: 55 Bit Score: 39.97 E-value: 3.14e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWW---TGSIGERtGIFPSNYVR 1054
Cdd:cd11897      4 ALYDFRSENPGEISLREHEVLsLCSEQDIEGWlegVNSRGDR-GLFPASYVE 54

Src Homology 3 domain of Membrane Protein, Palmitoylated 3 (or MAGUK p55 subfamily member 3); MPP3 is a scaffolding protein that colocalizes with MPP5 and CRB1 at the subdpical region adjacent to adherens junctions and may function in photoreceptor polarity. It interacts with some nectins and regulates their trafficking and processing. Nectins are cell-cell adhesion proteins involved in the establishment apical-basal polarity at cell adhesion sites. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212972 Cd Length: 62 Bit Score: 40.33 E-value: 3.23e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1153 AMYDY-------IANNEDELNFSKGQLINVMNKDDPDWWQ----GEINGVTGLFPS 1197
Cdd:cd12039      4 ALFDYnpyedraIPCQEAGLPFKRRDILEVVSQDDPTWWQakrvGDTNLRAGLIPS 59

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 40.46 E-value: 3.24e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11975      5 VSAEAVWDHVTMANRELAFKAGDVIKVLDaSNKDWWWGQIDDEEGWFPASFVRL 58

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 40.16 E-value: 3.27e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGelqARGKKRQKGWFPASHVKL 1133
Cdd:cd11940      3 QCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEG---VRLSDGERGWFPQSHVEE 55

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 40.09 E-value: 3.29e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11959      3 VALYDYQAADDDEISFDPDDIITnIEMIDEGWWRGVCRGKYGLFPANYV 51

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 39.91 E-value: 3.33e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSY 969
Cdd:cd11952      5 ALWDYSAEFPDELSFKEGDMVTVLRkdgEGTDWWWASLCGREGYVPRNY 53

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 39.93 E-value: 3.34e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  786 LYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVEK 836
Cdd:cd11939      5 VHPYVSQEPDELSLELADVLNILDKT--DDGWIFGErlHDQERGWFPSSVVEE 55

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 40.05 E-value: 3.49e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqargKKRQKGWFPASHVKL 1133
Cdd:cd11824      2 YSVLYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVE-----RNGQKGLVPGTYLEK 53

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 39.97 E-value: 3.52e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDD---PDWWQGEINGVTGLFPSNYVKM 1202
Cdd:cd12002      4 ALYDNVPECAEELAFRKGDILTVIEQNTgglEGWWLCSLHGRQGIAPGNRLKL 56

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 40.07 E-value: 3.59e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-----WWFGEVHGGRGWFP 966
Cdd:cd11762      2 VRALYDYEAQSDEELSFPEGAIIRILRKDDNgvddgWWEGEFNGRVGVFP 51

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 40.07 E-value: 3.59e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQKDG-EWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11806      1 EYVAIADFVATDDSQLSFESGDKLLVLRKPSvDWWWAEHNGCCGYIPASHLHQ 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 40.01 E-value: 3.72e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11946      1 MEAIAKYDFKATADDELSFKRGDILKVLneECDQNWYKAELNGKDGFIPKNYIEM 55

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 39.98 E-value: 3.78e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELqargkKRQKGWFPASHV 1131
Cdd:cd11772      7 DYEAQHPDELSFEEGDLLYISDKSDPNWWKATC-----GGKTGLIPSNYV 51

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 39.92 E-value: 3.80e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE--WWTGSIGERTGIFPSNYV 1053
Cdd:cd11830      3 KARYDFCARDMRELSLKEGDVVKIYNKKGQqgWWRGEINGRIGWFPSTYV 52

Src homology 3 domain of RUN and SH3 domain-containing protein 2; RUSC2, also called Iporin or Interacting protein of Rab1, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212890 Cd Length: 52 Bit Score: 39.90 E-value: 3.81e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11957      1 EVKALCHHIATEPGQLSFNKGDILQVLSRADGDWLRCSLGPDSGLVPIAYV 51

Src Homology 3 domain of Cdc42-Interacting Protein 4; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4), Formin Binding Protein 17 (FBP17), FormiN Binding Protein 1-Like (FNBP1L), and similar proteins. CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. It functions downstream of Cdc42 in PDGF-dependent actin reorganization and cell migration, and also regulates the activity of PDGFRbeta. It uses Src as a substrate in regulating the invasiveness of breast tumor cells. CIP4 may also play a role in the pathogenesis of Huntington's disease. Members of this subfamily typically contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain, a central Cdc42-binding HR1 domain, and a C-terminal SH3 domain. The SH3 domain of CIP4 associates with Gapex-5, a Rab31 GEF. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212844 [Multi-domain] Cd Length: 55 Bit Score: 39.94 E-value: 3.90e-04

                           10        20        30
                   ....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGW 817
Cdd:cd11911      3 TALYDFDGTSEGTLSMEEGEILLVLEEDGGD-GW 35

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 39.62 E-value: 3.96e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11874      1 RCKVLFSYTPQNEDELELKVGDTIEVLGEvEEGWWEGKLNGKVGVFPSNFVKE 53

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 40.26 E-value: 3.96e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQE----NWWFGEVHGGRGWFPKSYVKIIP 974
Cdd:cd12003      3 AKALYDNAAESPEELSFRRGDVLMVLKREHgslpGWWLCSLHGQQGIAPANRLRLLP 59

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 40.02 E-value: 4.00e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd11844      2 ARALYDNVAESPDELAFRRGDILTVLEQNtaglEGWWLCSLRGRQGIAPGNRLKL 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 39.87 E-value: 4.20e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE----WWTGSIGERTGIFPSNYVR 1054
Cdd:cd12003      5 ALYDNAAESPEELSFRRGDVLMVLKREHGslpgWWLCSLHGQQGIAPANRLR 56

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 39.61 E-value: 4.21e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11920      5 AVYDFKAQTSKELSFKKGDTVYILRKiDQNWYEGEHHGRVGIFPISYV 52

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 39.68 E-value: 4.22e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVT--GLFPSNYVK 1201
Cdd:cd11858      4 ALYDFAGSVANELSLKKDDIVYIVQKEDNGWWLAKKLDESkeGWVPAAYLE 54

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 39.65 E-value: 4.24e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYGSF-QGKFGWFPCNYV 834
Cdd:cd12006      3 FVALYDYEARTEDDLSFHKGEKFQILNSSEGD-WWEARSLtTGETGYIPSNYV 54

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 44.41 E-value: 4.26e-04

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  368 RKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEW-ERKQRELQEQEWKKQLELEKRLEKQ 430
Cdd:PRK09510    66 RQQQQQKSAKRAEEQRKKKEQQQAEELQQKQAAEQERLkQLEKERLAAQEQKKQAEEAAKQAAL 129

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 39.63 E-value: 4.29e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQgeLQARGKkrqKGWFPASHVK 1132
Cdd:cd12077      8 PYTSQGKDEIGFEKGVTVEVIQKNLEGWWY--IRYLGK---EGWAPASYLK 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 39.61 E-value: 4.34e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGG---RGWFPKSY 969
Cdd:cd11821      1 RVRALYDCQADNDDELTFSEGEIIVVTgEEDDEWWEGHIEGDpsrRGVFPVSF 53

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 45.05 E-value: 4.36e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  500 RRQELLNQknreQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQCDLEIMEIKQLQQELQ 579
Cdd:TIGR02168  675 RRREIEEL----EEKIEELEEKIAELEKALAELRKELEELEEELEQLRKELEELSRQISALRKDLARLEAEVEQLEERIA 750

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  580 EYQNKLIYLVPEKQLLNERIKNMQLsntpdsgisllhkKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQlkcgnm 659
Cdd:TIGR02168  751 QLSKELTELEAEIEELEERLEEAEE-------------ELAEAEAEIEELEAQIEQLKEELKALREALDELRAE------ 811

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  660 ddsvlqcllsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKELErkRLEQiQKKKLEDEAARKAKQgKENLWk 739
Cdd:TIGR02168  812 ---------------------LTLLNEEAANLRERLESLERRIAATERRLE--DLEE-QIEELSEDIESLAAE-IEELE- 865

                          250       260       270       280
                   ....*....|....*....|....*....|....*....|.
gi 1958785258  740 ESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARAL 780
Cdd:TIGR02168  866 ELIEELESELEALLNERASLEEALALLRSELEELSEELREL 906

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 39.69 E-value: 4.41e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTG-SIGERTGIFPSNYV 1053
Cdd:cd11960      4 ALYDYQAADDTEISFDPGDIITdIEQIDEGWWRGtGPDGTYGLFPANYV 52

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 39.63 E-value: 4.50e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258  928 WTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12077      9 YTSQGKDEIGFEKGVTVEVIQKNlEGWWYIRYLGKEGWAPASYLK 53

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 44.47 E-value: 4.75e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  340 SINGTLPSYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQvlmEQQQREAERKAQKEKEEWERKQRELQEQEwKK 419
Cdd:pfam02029  226 RQGGLSQSQEREEEAEVFLEAEQKLEELRRRRQEKESEEFEKLRQ---KQQEAELELEELKKKREERRKLLEEEEQR-RK 301

                           90
                   ....*....|.
gi 1958785258  420 QLELEKRLEKQ 430
Cdd:pfam02029  302 QEEAERKLREE 312

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 39.36 E-value: 4.85e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12017      2 YFTIGEFQATIQDGISFQKGQKVEVIDKNPS--GWWYVKIDGKEGWAPSSYIEK 53

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 39.91 E-value: 4.88e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHG-----GRGWFPKSYVKII 973
Cdd:cd11994      2 AQVTTAYVASGVEQLSLSPGQLILILKKNSSgWWLGELQArgkkrQKGWFPASHVKLL 59

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 39.50 E-value: 4.90e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 970
Cdd:cd12045      3 QGLWDCTGDQPDELSFKRGDTIYILSKEYNrfgWWVGEMKGTIGLVPKAYI 53

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 39.36 E-value: 4.91e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12016      2 KYITTQAYKAENEDEIGFETGVVVEVIQKNLDGWWKIRYQGKEGWAPATYLK 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 39.61 E-value: 4.93e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258 1085 ASGAEQLSLAPGQLILILKKNSSGWWQGELQarGKKRQKGWFPAS 1129
Cdd:cd11821     10 ADNDDELTFSEGEIIVVTGEEDDEWWEGHIE--GDPSRRGVFPVS 52

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 39.49 E-value: 5.02e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  787 YPFEARNHDEMSFNSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12052      6 FDYKAQHEDELTITVGDIITKIKKDDG--GWWEGEIKGRRGLFPDNFVRE 53

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 39.64 E-value: 5.06e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEK-TVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11844      3 RALYDNVAESPDELAFRRGDILTVLEQnTAGLEGWWLCSLRGRQGIAPGNRLK 55

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 39.37 E-value: 5.43e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV-TQKDGEW-WTGSIGERTGIFPSNYV 1053
Cdd:cd11774      4 ALYDYDKQTEEELSFNEGDTLDVyDDSDSDWiLVGFNGTQFGFVPANYI 52

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 39.65 E-value: 5.44e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1149 CQVIamYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEIN--GVTGLFPSNYV 1200
Cdd:cd11761      4 CKVL--YSYEAQRPDELTITEGEELEVIEDGDGDGWVKARNksGEVGYVPENYL 55

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 39.43 E-value: 5.47e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEelLVTQ---KDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12073      4 VALYDYQGEGDDEISFDPQE--TITDiemVDEGWWKGTCHGHRGLFPANYVE 53

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 39.49 E-value: 5.60e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258  928 WTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:cd12052      8 YKAQHEDELTITVGDIITKIKKDDGgWWEGEIKGRRGLFPDNFVR 52

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 39.24 E-value: 5.76e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12076      2 KYTVIYPYTARDQDEINLEKGAVVEVIQKNlEGWWKIRYQGKEGWAPASYLK 53

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 39.33 E-value: 5.81e-04

                           10        20        30
                   ....*....|....*....|....*....|....*....
gi 1958785258  932 KENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSY 969
Cdd:cd12015     12 QPNEISLRAGDVVDVIEKNENgWWFVSLEDEQGWVPATY 50

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 39.59 E-value: 6.10e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSiGERT---GIFPSNYVRP 1055
Cdd:cd11916      4 YQALYSYAPQNDDELELRDGDIVDVMEKcDDGWFVGT-SRRTkqfGTFPGNYVKL 57

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 39.25 E-value: 6.26e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYVRP 1055
Cdd:cd11781      3 RALYPFKAQSAKELSLKKGDIIYIRRQiDKNWYEGEHNGRVGIFPASYVEI 53

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 39.23 E-value: 6.52e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCN 832
Cdd:cd11954      5 ALWDYEAQNADELSFQEGDAITIlRRKDDSETEWWWARLNDKEGYVPKN 53

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 39.24 E-value: 6.60e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1006 IALYSYssvEPGD------LTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNY 1052
Cdd:cd11787      3 KALYDF---EMKDedekdcLTFKKGDVITVIRRvDENWAEGRLGDKIGIFPISF 53

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 39.21 E-value: 6.67e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12055      1 RCQVAFSYLPQNEDELELKVGDIIEVVgEVEEGWWEGVLNGKTGMFPSNFIK 52

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 39.09 E-value: 6.80e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  786 LYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11815      5 LHDFPAEHSDDLSLNSGEIVYLLEKIDTE--WYRGKCKNTTGIFPANHVK 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 38.96 E-value: 6.81e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPS 1050
Cdd:cd11832      2 FIAVKSYSPQEEGEISLHKGDRVKVLSiGEGGFWEGSVRGRTGWFPS 48

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 39.02 E-value: 6.95e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11833      4 ALYKFKPQENEDLEMRPGDKITLLDdSNEDWWKGKIEDRVGFFPANFV 51

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 39.21 E-value: 7.24e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEWWTGSIGERT---GIFPSNYVRP 1055
Cdd:cd11925      3 YLALYAYKPQKNDELELRKGEMYRVIEKCQDGWFKGTSLRTgvsGVFPGNYVTP 56

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 43.60 E-value: 7.35e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  481 SCAAKQELERQRRleweriRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVL 560
Cdd:COG4942     15 AAAQADAAAEAEA------ELEQLQQEIAELEKELAALKKEEKALLKQLAALERRIAALARRIRALEQELAALEAELAEL 88

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  561 DKQcdLEIMEIKqlqqelqeyqnkliyLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSEkeelcqrlkeqldalekET 640
Cdd:COG4942     89 EKE--IAELRAE---------------LEAQKEELAELLRALYRLGRQPPLALLLSPEDFL-----------------DA 134

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  641 ASKLSEMDSFNNQLKcgnmddsvlqcllsllsclnnlflllkELRESYNTQQLALEQLHKIKRDKLKELERKRLEQ-IQK 719
Cdd:COG4942    135 VRRLQYLKYLAPARR---------------------------EQAEELRADLAELAALRAELEAERAELEALLAELeEER 187

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  720 KKLEDEAARKAKQGKEnlwkesIRKEEEEKQKRLQE-EKSQDRTQEEERKTEAKQSETARA 779
Cdd:COG4942    188 AALEALKAERQKLLAR------LEKELAELAAELAElQQEAEELEALIARLEAEAAAAAER 242

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 44.17 E-value: 7.63e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  337 QIDSINGTLPSYQKTQEEEPQKKLPVTFEdKRKANYERGNMELEKRRQVlmeqqqrEAERKaQKEKEEWERKQRELQEQE 416
Cdd:pfam15709  301 QTFVVTGNMESEEERSEEDPSKALLEKRE-QEKASRDRLRAERAEMRRL-------EVERK-RREQEEQRRLQQEQLERA 371

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  417 WKKQLELEkrLEKQRELERQREEERRkeierrescisfpLMREREWisvykdrkgfmaelwkpgscaaKQELERQRRLEW 496
Cdd:pfam15709  372 EKMREELE--LEQQRRFEEIRLRKQR-------------LEEERQR----------------------QEEEERKQRLQL 414

                          170       180       190       200       210       220       230
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  497 ----ERIRRQE-------LLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELE 558
Cdd:pfam15709  415 qaaqERARQQQeefrrklQELQRKKQQEEAERAEAEKQRQKELEMQLAEEQKRLMEMAEEERLEYQRQKQEAE 487

Src Homology 3 domain of Myosin XVb; Myosin XVb, also called KIAA1783, was named based on its similarity with myosin XVa. It is a transcribed and unprocessed pseudogene whose predicted amino acid sequence contains mutated or deleted amino acid residues that are normally conserved and important for myosin function. The related myosin XVa is important for normal growth of mechanosensory stereocilia of inner ear hair cells. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 213001 Cd Length: 55 Bit Score: 39.09 E-value: 7.63e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINV--MNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12068      2 VVALRSYITDDKSLLSFHRGDLIKLlpMAGLEPGWQFGSTGGRSGLFPADIVQ 54

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 38.88 E-value: 7.95e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEEL--LVTQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11804      1 EAVAKHDFKATAEDELSFKKGSILkvLNMEDDPNWYKAELDGKEGLIPKNYI 52

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 38.80 E-value: 8.11e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKD--GeWWTGSIGERTGI-----FPSNY 1052
Cdd:cd11883      3 VALYDFTPKSKNQLSFKAGDIIYVLNKDpsG-WWDGVIISSSGKvkrgwFPSNY 55

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 38.98 E-value: 8.11e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd12016      5 TTQAYKAENEDEIGFETGVVVEVIQKNLDGWWKIRYQGK-----EGWAPATYLK 53

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 39.02 E-value: 8.32e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEV--HGGRGWFPKSYV 970
Cdd:cd11889      1 KVKAVYSWAGETEGDLGFLEGDLIEVLSiGDGSWWSGKLrrNGAEGIFPSNFV 53

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 38.84 E-value: 8.40e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11992      4 ALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVR 51

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 44.14 E-value: 8.49e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  629 LKEQLDALEKEtaskLSEMDSFNNQLKcgnmddsVLQCLlsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKE 708
Cdd:COG4913    666 AEREIAELEAE----LERLDASSDDLA-------ALEEQ-------------LEELEAELEELEEELDELKGEIGRLEKE 721

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  709 LERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARALVNYRALYP 788
Cdd:COG4913    722 LEQAEEELDELQDRLEAAEDLARLELRALLEERFAAALGDAVERELRENLEERIDALRARLNRAEEELERAMRAFNREWP 801


                   ....*..
gi 1958785258  789 FEARNHD 795
Cdd:COG4913    802 AETADLD 808

C-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The C-terminal SH3 domain of CRK has not been shown to bind any target protein; it acts as a negative regulator of CRK function by stabilizing a structure that inhibits the access by target proteins to the N-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212693 [Multi-domain] Cd Length: 57 Bit Score: 39.01 E-value: 8.50e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1077 AQVTSAYAASGaeqLSLAPGQLILILKKNSSGWWQGELqaRGKkrqKGWFPASHVKL 1133
Cdd:cd11759      9 KRVPNAYDKTA---LALEVGDLVKVTKINVSGQWEGEL--NGK---VGHFPFTHVEL 57

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 38.88 E-value: 8.65e-04

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11796      4 VLQDLSAQLDEELDLREGDVVTITGiLDKGWFRGELNGRRGIFPEGFV 51

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 38.94 E-value: 8.85e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYGSFQ-GKFGWFPCNYV 834
Cdd:cd12008      2 FVALYDYESRTETDLSFKKGERLQIVNNTEGD-WWLAHSLTtGQTGYIPSNYV 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 38.79 E-value: 9.01e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  784 RALYPFEARNHDEMSFNSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11919      4 RAKFDFKAQTLKELPLQKGDIVyiykQIDQN------WYEGEHHGRVGIFPRSYIE 53

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 38.86 E-value: 9.23e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGE--VHGGRGWFPKSYV 970
Cdd:cd11793      2 VQCVHAYTAQQPDELTLEEGDVVNVLRKMpDGWYEGErlRDGERGWFPSSYT 53

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 38.63 E-value: 9.25e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN--WWFGEVHGGRGWFPKSY 969
Cdd:cd11778      1 YVEALYDYEAQGDDEISIRVGDRIAVIRGDDGsgWTYGEINGVKGLFPTSY 51

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 43.96 E-value: 9.31e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  367 KRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEie 446
Cdd:pfam17380  386 ERQQKNERVRQELEAARKVKILEEERQRKIQQQKVEMEQIRAEQEEARQREVRRLEEERAREMERVRLEEQERQQQVE-- 463

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  447 rrescisfpLMREREwisvyKDRKGFMAELWKPGSCAAKQELERQRRLEWE-RIRRQELLNQKNREQEEIVRLNSKKKSL 525
Cdd:pfam17380  464 ---------RLRQQE-----EERKRKKLELEKEKRDRKRAEEQRRKILEKElEERKQAMIEEERKRKLLEKEMEERQKAI 529

                          170       180       190       200
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258  526 HLELEAVNGKHQQisGRLQDVRIRKQTQKTELEVLDKQCDLEIME 570
Cdd:pfam17380  530 YEEERRREAEEER--RKQQEMEERRRIQEQMRKATEERSRLEAME 572

Src Homology 3 domain of the p85 regulatory subunit of Class IA Phosphatidylinositol 3-kinases; Class I PI3Ks convert PtdIns(4,5)P2 to the critical second messenger PtdIns(3,4,5)P3. They are heterodimers and exist in multiple isoforms consisting of one catalytic subunit (out of four isoforms) and one of several regulatory subunits. Class IA PI3Ks associate with the p85 regulatory subunit family, which contains SH3, RhoGAP, and SH2 domains. The p85 subunits recruit the PI3K p110 catalytic subunit to the membrane, where p110 phosphorylates inositol lipids. Vertebrates harbor two p85 isoforms, called alpha and beta. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212710 Cd Length: 72 Bit Score: 39.41 E-value: 9.36e-04

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  781 VNYRALYPFEARNHDEMSFNSGDIIQVD------------EKTVGEP-GWLYGSFQ--GKFGWFPCNYVE 835
Cdd:cd11776      1 VQYRALYDYEKERDEDIILKTGDVLVVEnpellalgvpdgKETVPKPeGWLEGKNErtGERGDFPGTYVE 70

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 38.92 E-value: 9.41e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSS----GWWQGELQARgkkrqKGWFPA 1128
Cdd:cd11762      8 YEAQSDEELSFPEGAIIRILRKDDNgvddGWWEGEFNGR-----VGVFPS 52

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 38.57 E-value: 9.52e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11866      2 YMGLWDCSGNEPDELSFKRGDLIYIISKEYDSFGWWVGELNGKVGLVPKDYL 53

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 38.60 E-value: 9.75e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYV 834
Cdd:cd11784      2 CVALHSYSAHRPEELELQKGEGVRVLGKF--QEGWLRGLslVTGRVGIFPSNYV 53

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 38.66 E-value: 9.91e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11870      1 QVVALHRYEAQGPEDLGFREGDTIDVLSEvNEAWLEGHSDGRVGIFPKCFVV 52

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 38.69 E-value: 1.03e-03

                           10        20
                   ....*....|....*....|....*...
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEK 810
Cdd:cd11847      2 YKALWDFKARGDEELSFQAGDQFRIAER 29

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 43.98 E-value: 1.05e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  337 QIDSINGTLPSY--------QKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAE--RKAQK-EKEEW 405
Cdd:PTZ00121  1065 HVGQDEGLKPSYkdfdfdakEDNRADEATEEAFGKAEEAKKTETGKAEEARKAEEAKKKAEDARKAEeaRKAEDaRKAEE 1144

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  406 ERKQRELQEQEWKKQLELEKRLE--------KQRELERQReeerrkeierrescisfplmrerewISVYKDRKGFMAELW 477
Cdd:PTZ00121  1145 ARKAEDAKRVEIARKAEDARKAEearkaedaKKAEAARKA-------------------------EEVRKAEELRKAEDA 1199

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  478 KPGSCAAKQELERQ----RRLEWER----IRRQELLNQKNRE--QEEIVRLNSKKKSLHlELEAVNGKHQQISGRLQDVR 547
Cdd:PTZ00121  1200 RKAEAARKAEEERKaeeaRKAEDAKkaeaVKKAEEAKKDAEEakKAEEERNNEEIRKFE-EARMAHFARRQAAIKAEEAR 1278

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  548 ----IRKQTQKTELEVLDKQCDLEIMEIKQLQQELQEYQNKLIYLVPE--------KQLLNERIKNMQLSNTPDSGISLL 615
Cdd:PTZ00121  1279 kadeLKKAEEKKKADEAKKAEEKKKADEAKKKAEEAKKADEAKKKAEEakkkadaaKKKAEEAKKAAEAAKAEAEAAADE 1358

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  616 HKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGNMDDSVLQCLLSLLSCLNNLFLLLKELRESYNTQQLAL 695
Cdd:PTZ00121  1359 AEAAEEKAEAAEKKKEEAKKKADAAKKKAEEKKKADEAKKKAEEDKKKADELKKAAAAKKKADEAKKKAEEKKKADEAKK 1438

                          410       420       430       440       450       460       470       480
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  696 EQLHKIKRDKLKEL--ERKRLEQIQKKKLE----DEAARKAKQGK--ENLWK--ESIRKEEEEKQKRLQEEKSQD--RTQ 763
Cdd:PTZ00121  1439 KAEEAKKADEAKKKaeEAKKAEEAKKKAEEakkaDEAKKKAEEAKkaDEAKKkaEEAKKKADEAKKAAEAKKKADeaKKA 1518

                          490
                   ....*....|....*.
gi 1958785258  764 EEERKT-EAKQSETAR 778
Cdd:PTZ00121  1519 EEAKKAdEAKKAEEAK 1534

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 38.51 E-value: 1.06e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258 1089 EQLSLAPGQLILILKKNSSGWWQGelqaRGKKRQkGWFPASHVKL 1133
Cdd:cd11974     15 QELAFKAGDVIRVLEASNKDWWWG----RNEDRE-AWFPASFVRL 54

Src Homology 3 domain of SH3 domain and tetratricopeptide repeat-containing (SH3TC) proteins and similar domains; This subfamily is composed of vertebrate SH3TC proteins and hypothetical fungal proteins containing BAR and SH3 domains. Mammals contain two SH3TC proteins, SH3TC1 and SH3TC2. The function of SH3TC1 is unknown. SH3TC2 is localized in Schwann cells in the peripheral nervous system, where it interacts with Rab11 and plays a role in peripheral nerve myelination. Mutations in SH3TC2 are associated with Charcot-Marie-Tooth disease type 4C, a severe hereditary peripheral neuropathy with symptoms that include progressive scoliosis, delayed age of walking, muscular atrophy, distal weakness, and reduced nerve conduction velocity. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212818 Cd Length: 55 Bit Score: 38.45 E-value: 1.07e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVT---QKDGEWWTGSIGE--RTGIFPSNYV 1053
Cdd:cd11885      4 AKMDFEGVEPGELSFRQGDSIEIIgdlIPGLQWFVGRSKSsgRVGFVPTNHF 55

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 43.89 E-value: 1.09e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  350 KTQEEEPQKKLPVTFEDKRKANYERGNMELEKrrqvlMEQQQREAERKAQKEKEEWERKQRELQEQEwKKQLELEKRL-- 427
Cdd:TIGR02168  219 KAELRELELALLVLRLEELREELEELQEELKE-----AEEELEELTAELQELEEKLEELRLEVSELE-EEIEELQKELya 292

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  428 --EKQRELERQreeerrkeierrescisfplmrerewISVYKDRKGFmaelwkpgscAAKQELERQRRLEWERIRRQELL 505
Cdd:TIGR02168  293 laNEISRLEQQ--------------------------KQILRERLAN----------LERQLEELEAQLEELESKLDELA 336

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  506 NQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQcdleimeikqlqqeLQEYQNKL 585
Cdd:TIGR02168  337 EELAELEEKLEELKEELESLEAELEELEAELEELESRLEELEEQLETLRSKVAQLELQ--------------IASLNNEI 402

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  586 IYLVPEKQLLNERIKNMQlsntpdSGISLLHKKSSEKEElcQRLKEQLDALEKETASKLSEMDSFNNQLKcgnmddsvlq 665
Cdd:TIGR02168  403 ERLEARLERLEDRRERLQ------QEIEELLKKLEEAEL--KELQAELEELEEELEELQEELERLEEALE---------- 464

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  666 cllsllsclnnlfLLLKELRESYNTQQLALEQLHKiKRDKLKELER--KRLEQIQKKKLEDEAARKAKQGKENLWKESIR 743
Cdd:TIGR02168  465 -------------ELREELEEAEQALDAAERELAQ-LQARLDSLERlqENLEGFSEGVKALLKNQSGLSGILGVLSELIS 530


                   ....
gi 1958785258  744 KEEE 747
Cdd:TIGR02168  531 VDEG 534

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 38.80 E-value: 1.09e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1007 ALYSYSSVEPG-DLTFTEGEELLVTQK------DGEWWTGSIGE-RTGIFPSNYV 1053
Cdd:cd11771      4 ALYDFTPENPEmELSLKKGDIVAVLSKtdplgrDSEWWKGRTRDgRIGWFPSNYV 58

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 38.45 E-value: 1.11e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPDWWQ-GEINGVTGLFPSNYVK 1201
Cdd:cd11849      4 ALYDFKSAEPNTLSFSEGETFLLLERSNAHWWLvTNHSGETGYVPANYVK 53

EF-hand domain pair;

Pssm-ID: 463900 [Multi-domain] Cd Length: 67 Bit Score: 38.77 E-value: 1.12e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  248 KYRQKFNSLDKSMSGYLSG--FQA--RNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAM 307
Cdd:pfam13499    3 KLKEAFKLLDSDGDGYLDVeeLKKllRKLEEGEPLSDEEVEELFKEFDLDKDGRISFEEFLELY 66

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 38.62 E-value: 1.12e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258  789 FEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVE 835
Cdd:cd11940      8 YKAQENDELTLEKADIIMVRQQS--SDGWLEGVrlSDGERGWFPQSHVE 54

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 38.71 E-value: 1.14e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  920 LKAQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd12000      1 LLARALYDNKADCSDELAFRRGDILTVLEQNvpgsEGWWKCLLHGRQGLAPANRLQL 57

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 38.50 E-value: 1.16e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWT---GSIGErTGIFPSNYV 1053
Cdd:cd11761      5 KVLYSYEAQRPDELTITEGEELeVIEDGDGDGWVkarNKSGE-VGYVPENYL 55

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 38.63 E-value: 1.21e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQE-----NWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12141      4 AVYTFKARSPNELSVSANQRVRILEFSDltgnkEWWLAEANGQKGYVPSNYIR 56

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 38.37 E-value: 1.24e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11921      4 RLKFDFQAQSPKELTLQKGDIVYIHKEV--DKNWLEGEHHGRVGIFPANYVE 53

Src homology 3 domain of Rho GTPase-activating proteins 32 and 33, and similar proteins; Members of this family contain N-terminal PX and Src Homology 3 (SH3) domains, a central Rho GAP domain, and C-terminal extensions. RhoGAPs (or ARHGAPs) bind to Rho proteins and enhance the hydrolysis rates of bound GTP. ARHGAP32 is also called RICS, PX-RICS, p250GAP, or p200RhoGAP. It is a Rho GTPase-activating protein for Cdc42 and Rac1, and is implicated in the regulation of postsynaptic signaling and neurite outgrowth. PX-RICS, a variant of RICS that contain PX and SH3 domains, is the main isoform expressed during neural development. It is involved in neural functions including axon and dendrite extension, postnatal remodeling, and fine-tuning of neural circuits during early brain development. ARHGAP33, also called sorting nexin 26 or TCGAP (Tc10/CDC42 GTPase-activating protein), is widely expressed in the brain where it is involved in regulating the outgrowth of axons and dendrites and is regulated by the protein tyrosine kinase Fyn. It is translocated to the plasma membrane in adipocytes in response to insulin and may be involved in the regulation of insulin-stimulated glucose transport. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212769 [Multi-domain] Cd Length: 54 Bit Score: 38.20 E-value: 1.30e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1157 YIANNEDELNFSKGQLINVMN---KDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd11835      8 YTAQAPDELSLEVGDIVSVIDmppPEESTWWRGKKGFQVGFFPSECV 54

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 38.21 E-value: 1.30e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGW-LYGSFQGKFGWFPCNYV 834
Cdd:cd11774      3 KALYDYDKQTEEELSFNEGDTLDVYDDS--DSDWiLVGFNGTQFGFVPANYI 52

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 38.44 E-value: 1.31e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 970
Cdd:cd11772      4 ALYDYEAQHPDELSFEEGDLLYISDKSDpNWWKATCGGKTGLIPSNYV 51

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 38.32 E-value: 1.32e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTV-GEPGWLYGSFQGKFGWFPCN 832
Cdd:cd12000      4 RALYDNKADCSDELAFRRGDILTVLEQNVpGSEGWWKCLLHGRQGLAPAN 53

N-terminal domain of Kruppel-like factor 3; Kruppel-like factor 3 (KLF3; also called Krueppel-like factor 3 and originally called Basic Kruppel-like Factor/BKLF), was the third member of the KLF family of zinc finger transcription factors to be discovered. KLF3 possesses a wide range of biological impacts on regulating apoptosis, differentiation, and proliferation in various tissues during the entire progression process. It has been proposed as a tumor suppressor in colorectal cancer. It appears to function predominantly as a repressor of transcription, turning genes off by recruiting the C-terminal Binding Protein co-repressors CtBP1 and CtBP2. CtBP docks onto a short motif (residues 61-65) in the N-terminus of KLF3, through the Proline-X-Aspartate-Leucine-Serine (PXDLS) motif. CtBP in turn recruits histone modifying enzymes to alter chromatin and repress gene expression. KLF3 belongs to a family of proteins, called the Specificity Protein (SP)/KLF family, characterized by a C-terminal DNA-binding domain of 81 amino acids consisting of three Kruppel-like C2H2 zinc fingers. These factors bind to a loose consensus motif, namely NNRCRCCYY (where N is any nucleotide; R is A/G, and Y is C/T), such as the recurring motifs in GC and GT boxes (5'-GGGGCGGGG-3' and 5-GGTGTGGGG-3') that are present in promoters and more distal regulatory elements of mammalian genes. Members of the KLF family can act as activators or repressors of transcription depending on cell and promoter context. KLFs regulate various cellular functions, such as proliferation, differentiation, and apoptosis, as well as the development and homeostasis of several types of tissue. In addition to the C-terminal DNA-binding domain, each KLF also has a unique N-terminal activation/repression domain that confers specificity and allows it to bind specifically to a certain partner, leading to distinct activities in vivo. This model represents the N-terminal domain of KLF3.

Pssm-ID: 410554 [Multi-domain] Cd Length: 214 Bit Score: 41.95 E-value: 1.34e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  106 PPMFSPLISARFGMGSMPNLSIHQPLPPVAPITAPLSsatsgtsIPPLMMPAPLVPSVSTSSLPNGTASLIQPLSIPYSS 185
Cdd:cd21577     42 SSSSSSSPSSRASPPSPYSKSSPPSPPQQRPLSPPLS-------LPPPVAPPPLSPGSVPGGLPVISPVMVQPVPVLYPP 114

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 38.47 E-value: 1.35e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQV-DEKTvgEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd11946      5 AKYDFKATADDELSFKRGDILKVlNEEC--DQNWYKAELNGKDGFIPKNYIE 54

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 38.41 E-value: 1.36e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1008 LYSYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSIGERTGIFPSNYVR 1054
Cdd:cd12054      6 LFEYVPQNEDELELKVGDIIDINEEVEEgWWSGTLNGKSGLFPSNFVK 53

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 38.40 E-value: 1.36e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd11873      8 YDAEEPDELTLKVGDIITNVKKMEEGWWEGTLNGK-----RGMFPDNFVK 52

Src Homology 3 domain of CASK interacting protein 2; Caskin2 is a multidomain adaptor protein that contains six ankyrin repeats, a single SH3 domain, tandem sterile alpha motif (SAM) domains, and a long disordered proline-rich region. It shares a domain architecture with Caskin1, but does not bind CASK. The function of Caskin2 is still unknown. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212996 Cd Length: 62 Bit Score: 38.41 E-value: 1.39e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  920 LKAQALCS-WTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGR------GWFPKSYVKII 973
Cdd:cd12063      1 LKVRALKDfWNLHDPTALNVRAGDVITVLEQHpDGRWKGHIHDSQrgtdrvGYFPPSIVEVI 62

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 43.10 E-value: 1.39e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLPvTFEDKRKAN---YERGNMELEKRRQVLMEQQqREAERKAQKEKEEWERKQRELQEQEWKKQLELEK 425
Cdd:COG3064      7 EKAAEAAAQERLE-QAEAEKRAAaeaEQKAKEEAEEERLAELEAK-RQAEEEAREAKAEAEQRAAELAAEAAKKLAEAEK 84


                   ....
gi 1958785258  426 RLEK 429
Cdd:COG3064     85 AAAE 88

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 38.48 E-value: 1.39e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLVTQKDGE----WWTGSIGERTGIFPSNYVR 1054
Cdd:cd11844      4 ALYDNVAESPDELAFRRGDILTVLEQNTAglegWWLCSLRGRQGIAPGNRLK 55

Src Homology 3 domain of Calcium/calmodulin-dependent Serine protein Kinase; CASK is a scaffolding protein that is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. CASK interacts with many different binding partners including parkin, neurexin, syndecans, calcium channel proteins, caskin, among others, to perform specific functions in different subcellular locations. Disruption of the CASK gene in mice results in neonatal lethality while mutations in the human gene have been associated with X-linked mental retardation. Drosophila CASK is associated with both pre- and postsynaptic membranes and is crucial in synaptic transmission and vesicle cycling. CASK contains an N-terminal calmodulin-dependent kinase (CaMK)-like domain, two L27 domains, followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213014 Cd Length: 62 Bit Score: 38.34 E-value: 1.40e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 1958785258 1156 DYIANNEDELNFSKGQLINVMNKDDPDWWQGE----INGVTGLFPS 1197
Cdd:cd12081     14 DLIPCKQAGIRFRVGDILQIISKDDHNWWQAKlensKNGTAGLIPS 59

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 38.87 E-value: 1.44e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCNYVEKMLSS-DKTP 844
Cdd:cd12001      6 KALYDNVAESPDELSFRKGDIMTVlERDTQGLDGWWLCSLHGRQGIVPGNRLKILVGMyDKKQ 68

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 43.52 E-value: 1.48e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  478 KPGSCAAKQELERQRRLeweRIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTEL 557
Cdd:TIGR02169  663 RGGILFSRSEPAELQRL---RERLEGLKRELSSLQSELRRIENRLDELSQELSDASRKIGEIEKEIEQLEQEEEKLKERL 739

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  558 EvlDKQCDLEIMEIKQLQQELqeyqnkliylvpEKQLLNERIknmqlsntpdsgisllhkksSEKEELCQRLKEQLDALE 637
Cdd:TIGR02169  740 E--ELEEDLSSLEQEIENVKS------------ELKELEARI--------------------EELEEDLHKLEEALNDLE 785

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  638 KETASklSEMDSFNNQLKcgnmddsvlqcllsllsclnnlflllkELRESYNTQQLALEQLHKI--KRDKLKELERKRLE 715
Cdd:TIGR02169  786 ARLSH--SRIPEIQAELS---------------------------KLEEEVSRIEARLREIEQKlnRLTLEKEYLEKEIQ 836

                          250       260       270       280       290       300       310
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  716 QIQKKKLEDEAARKAKQGKE---NLWKESIRKEEEEKQKRLQE--------EKSQDRTQEEERKTEAKQSE 775
Cdd:TIGR02169  837 ELQEQRIDLKEQIKSIEKEIenlNGKKEELEEELEELEAALRDlesrlgdlKKERDELEAQLRELERKIEE 907

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 38.16 E-value: 1.49e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 970
Cdd:cd11816      1 RCVARFDFEGEQEDELSFSEGDVITLKEYvGEEWAKGELNGKIGIFPLNFV 51

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 38.25 E-value: 1.54e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQ-----KDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd12141      2 YYAVYTFKARSPNELSVSANQRVRILEfsdltGNKEWWLAEANGQKGYVPSNYIR 56

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 38.20 E-value: 1.56e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*
gi 1958785258 1156 DYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYV 1200
Cdd:cd12017      7 EFQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDGKEGWAPSSYI 51

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 38.06 E-value: 1.57e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1009 YSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSIGERTGIFPSNYV 1053
Cdd:cd11902      7 FAYVAEREDELSLVKGSRVTVMEKcsDG-WWRGSYNGQIGWFPSNYV 52

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 38.03 E-value: 1.60e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQK--DGeWWTGSI--GERTGIFPSNYVRP 1055
Cdd:cd11926      2 YVAIYPYTPRKEDELELRKGEMFLVFERcqDG-WFKGTSmhTSKIGVFPGNYVAP 55

Src Homology 3 domain of Formin Binding Protein 1-Like; FormiN Binding Protein 1-Like (FNBP1L), also known as Toca-1 (Transducer of Cdc42-dependent actin assembly), forms a complex with neural Wiskott-Aldrich syndrome protein (N-WASP). The FNBP1L/N-WASP complex induces the formation of filopodia and endocytic vesicles. FNBP1L is required for Cdc42-induced actin assembly and is essential for autophagy of intracellular pathogens. It contains an N-terminal F-BAR domain, a central Cdc42-binding HR1 domain, and a C-terminal SH3 domain. The SH3 domain of the related protein, CIP4, associates with Gapex-5, a Rab31 GEF. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213005 [Multi-domain] Cd Length: 57 Bit Score: 38.05 E-value: 1.63e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGEpGWLYGSFQ-GKFGWFPCNYVE 835
Cdd:cd12072      4 KALYPFDGSNEGTLAMKEGEVLYIIEEDKGD-GWTRARKQnGEEGYVPTSYIE 55

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 38.08 E-value: 1.67e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDE---MSFNSGDIIQV----DEKtvgepgWLYGSFQGKFGWFPCNY 833
Cdd:cd11787      3 KALYDFEMKDEDEkdcLTFKKGDVITVirrvDEN------WAEGRLGDKIGIFPISF 53

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

Pssm-ID: 466641 [Multi-domain] Cd Length: 120 Bit Score: 39.90 E-value: 1.69e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  685 RESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLwkESIRKEEEEKQKRLQEEKS-QDRTQ 763
Cdd:pfam20492    1 REEAEREKQELEERLKQYEEETKKAQEELEESEETAEELEEERRQAEEEAERL--EQKRQEAEEEKERLEESAEmEAEEK 78

                           90
                   ....*....|....*.
gi 1958785258  764 EE-ERKTEAKQSETAR 778
Cdd:pfam20492   79 EQlEAELAEAQEEIAR 94

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 38.17 E-value: 1.70e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1079 VTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQargkkRQKGWFPASH 1130
Cdd:cd12015      4 VVADYKKQQPNEISLRAGDVVDVIEKNENGWWFVSLE-----DEQGWVPATY 50

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 37.86 E-value: 1.72e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKII 973
Cdd:cd11869      1 RAEALFDFTGNSKLELNFKAGDVIFLLSRvNKDWLEGTVRGATGIFPLSFVKII 54

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53; IRSp53 is also known as BAIAP2 (Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2). It is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. One variant (T-form) is expressed exclusively in human breast cancer cells. The gene encoding IRSp53 is a putative susceptibility gene for Gilles de la Tourette syndrome. IRSp53 can also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD, a CRIB (Cdc42 and Rac interactive binding motif), an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRSp53 has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212848 Cd Length: 59 Bit Score: 38.07 E-value: 1.72e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  921 KAQALCSWTAKKENHL-NFSKHDVITVL--EQQENWWFGEVHGG--RGWFPKSYVKII 973
Cdd:cd11915      2 RVQAIFSHAAGDNSTLlSFKEGDYITLLvpEARDGWHYGECEKTkmRGWFPFSYTRVL 59

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 43.19 E-value: 1.73e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  348 YQKT-QEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVlmeqQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKR 426
Cdd:pfam17380  280 HQKAvSERQQQEKFEKMEQERLRQEKEEKAREVERRRKL----EEAEKARQAEMDRQAAIYAEQERMAMERERELERIRQ 355

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  427 LEKQRELERQREEERrkeierresCISFPLMREREWISVYKDRKgfmaelwkpgSCAAKQELERQRRLEWERIRRQELLN 506
Cdd:pfam17380  356 EERKRELERIRQEEI---------AMEISRMRELERLQMERQQK----------NERVRQELEAARKVKILEEERQRKIQ 416

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  507 QKNREQEEIvrlnskkkslhleleavngKHQQISGRLQDVRIRKQTQKTELevldkqcdleimeikqlqqelqeyqnkli 586
Cdd:pfam17380  417 QQKVEMEQI-------------------RAEQEEARQREVRRLEEERAREM----------------------------- 448

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  587 ylvpekqllnERIKNMQLsntpdsgisllhkkssEKEELCQRLKEQldalEKETASKLSEMDsfnnqlkcgnmddsvlqc 666
Cdd:pfam17380  449 ----------ERVRLEEQ----------------ERQQQVERLRQQ----EEERKRKKLELE------------------ 480

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  667 llsllsclnnlflllKELREsyntQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDeaaRKAKQGKENLWKESIRKEE 746
Cdd:pfam17380  481 ---------------KEKRD----RKRAEEQRRKILEKELEERKQAMIEEERKRKLLE---KEMEERQKAIYEEERRREA 538

                          410       420
                   ....*....|....*....|....*...
gi 1958785258  747 EEKQKRLQEEKSQDRTQEEERKTEAKQS 774
Cdd:pfam17380  539 EEERRKQQEMEERRRIQEQMRKATEERS 566

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 38.07 E-value: 1.83e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLV-TQKDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11982      3 FMAVKPYQSQAEGEISLSKGEKIKVlSVGEGGFWEGQVKGRVGWFPSDCV 52

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 38.01 E-value: 1.85e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQ-KDGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11984      3 FIAVKAYSPQGEGEIQLNRGERVKVLSiGEGGFWEGTVKGRTGWFPADCV 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 37.69 E-value: 1.93e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNS-SGWWQGElQARGKkrqKGWFPASHV 1131
Cdd:cd11763      8 FDSQPSGELSLRAGEVLTITRQDVgDGWLEGR-NSRGE---VGLFPSSYV 53

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 38.00 E-value: 1.99e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGE-VHGG-RGWFPKSYVK 971
Cdd:cd11939      1 QVQCVHPYVSQEPDELSLELADVLNILDKTDDgWIFGErLHDQeRGWFPSSVVE 54

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 37.82 E-value: 2.01e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258  927 SWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd12016      8 AYKAENEDEIGFETGVVVEVIQKNlDGWWKIRYQGKEGWAPATYLKK 54

N-terminal (or first) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. The N-terminal SH3 domain increases the affinity of p67phox for the oxidase complex. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212804 Cd Length: 54 Bit Score: 37.96 E-value: 2.05e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEKM 837
Cdd:cd11871      2 HRVLYEFVPETKEELQVLPGNIVFVLKK--GTDNWATVVFNGKKGLVPCNFLEPV 54

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 37.63 E-value: 2.07e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 971
Cdd:cd12021      3 RAIADYEKSSKSEMALKTGDVVEVVEKSENgWWFCQLKAKRGWVPASYLE 52

Src homology 3 domain of RUN and SH3 domain-containing proteins 1 and 2; RUSC1 and RUSC2, that were originally characterized in silico. They are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. RUSC1, also called NESCA (New molecule containing SH3 at the carboxy-terminus), is highly expressed in the brain and is translocated to the nuclear membrane from the cytoplasm upon stimulation with neurotrophin. It plays a role in facilitating neurotrophin-dependent neurite outgrowth. It also interacts with NEMO (or IKKgamma) and may function in NEMO-mediated activation of NF-kB. RUSC2, also called Iporin, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212744 Cd Length: 50 Bit Score: 37.81 E-value: 2.08e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11810      2 VRALCHHVATDSGQLSFRKGDILRVIARVDDDWLLCTRGSTKGLVPLSY 50

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 37.76 E-value: 2.09e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYV 834
Cdd:cd11806      2 YVAIADFVATDDSQLSFESGDKLLVLRKPSVD--WWWAEHNGCCGYIPASHL 51

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 37.68 E-value: 2.10e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1075 EIAQVTSAYAASGAEQLSLAPGQLILIL-KKNSSGWWQGELQARGkkrQKGWFPASHVKL 1133
Cdd:cd11775      1 KRGKVLYDFDAQSDDELTVKEGDVVYILdDKKSKDWWMVENVSTG---KEGVVPASYIEI 57

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 37.62 E-value: 2.12e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQVdeKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd11984      5 AVKAYSPQGEGEIQLNRGERVKV--LSIGEGGFWEGTVKGRTGWFPADCV 52

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 37.85 E-value: 2.17e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1077 AQVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqarGKKRQKGWFPASHVKL 1133
Cdd:cd11962      2 AVVLYDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGT----NSKGESGLFPSNYVEL 54

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 37.58 E-value: 2.20e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYV 834
Cdd:cd11986      2 FVALYRFKALEKDDLDFHPGERITVIDDSNEE--WWRGKIGEKTGYFPMNFI 51

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 37.70 E-value: 2.25e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1010 SYSSVEPGDLTFTEGEELLVTQKDGE-WWTGSI-----GERTGIFPSNYVR 1054
Cdd:cd11839      7 PFTATAENQLSLAVGQLVLVRKKSPSgWWEGELqargkKRQIGWFPANYVK 57

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 40.41 E-value: 2.27e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  679 LLLKELResyntQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENlwKESIRKEEEEKQKRLQEEKS 758
Cdd:pfam05672   43 LRKEELR-----RRAEEERARREEEARRLEEERRREEEERQRKAEEEAEEREQREQEE--QERLQKQKEEAEAKAREEAE 115

                           90       100
                   ....*....|....*....|
gi 1958785258  759 QDRTQEEERKTEAKQSETAR 778
Cdd:pfam05672  116 RQRQEREKIMQQEEQERLER 135

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 37.61 E-value: 2.49e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELLV----TQKDGEWWTGSIGERTGIFPS 1050
Cdd:cd11894      4 ALYDYEGQTDDELSFPEGAIIRIlnkeNQDDDGFWEGEFNGRIGVFPS 51

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 37.61 E-value: 2.50e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLVTQKDGE-----WWTGSI-GERTGIFPSNYVR 1054
Cdd:cd11864      3 RAEYDFVAESEDELSFRAGDKLRLAPKELQprvrgWLLATVdGQKIGLVPANYVK 57

Uncharacterized N-terminal coiled-coil domain of peptidoglycan hydrolase CwlO [Function unknown];

Pssm-ID: 443091 [Multi-domain] Cd Length: 379 Bit Score: 42.12 E-value: 2.52e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  502 QELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQcdleimeikqlqqelqey 581
Cdd:COG3883     19 QAKQKELSELQAELEAAQAELDALQAELEELNEEYNELQAELEALQAEIDKLQAEIAEAEAE------------------ 80

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  582 qnkliyLVPEKQLLNERIKNMQLSNTPDSGISLLhKKSSEKEELCQRLkeqlDALEKETASKLSEMDSfnnqlkcgnmdd 661
Cdd:COG3883     81 ------IEERREELGERARALYRSGGSVSYLDVL-LGSESFSDFLDRL----SALSKIADADADLLEE------------ 137

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  662 svlqcllsllsclnnlfllLKELRESYNTQQLALEQlhkikrdKLKELERKRLEQIQKKKlEDEAARKAKQGKENLWKES 741
Cdd:COG3883    138 -------------------LKADKAELEAKKAELEA-------KLAELEALKAELEAAKA-ELEAQQAEQEALLAQLSAE 190

                          250       260       270
                   ....*....|....*....|....*....|....*...
gi 1958785258  742 IRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSETARA 779
Cdd:COG3883    191 EAAAEAQLAELEAELAAAEAAAAAAAAAAAAAAAAAAA 228

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 37.38 E-value: 2.53e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 970
Cdd:cd11809      2 ATAQFDYTGRSERELSFKKGDSLTLYRQVSDdWWRGQLNGQDGLVPHKYI 51

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 37.68 E-value: 2.54e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKK--NSSGWWQGELQARgkkrqKGWFPASHVK 1132
Cdd:cd11977      9 FAARDMRELSLREGDVVRIYSRigGDQGWWKGETNGR-----IGWFPSTYVE 55

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 37.74 E-value: 2.55e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  785 ALYPFEARNHDEMSFNSGDIIQV----DEKtvgEPGWLYGSFQGKFGWFPCNY 833
Cdd:cd11807      5 ALFDYEAENGDELSFREGDELTVlrkgDDD---ETEWWWARLNDKEGYVPRNL 54

Src homology 3 domain of RUN and SH3 domain-containing protein 2; RUSC2, also called Iporin or Interacting protein of Rab1, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212890 Cd Length: 52 Bit Score: 37.59 E-value: 2.71e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1004 EYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSIGERTGIFPSNYV 1053
Cdd:cd11957      1 EVKALCHHIATEPGQLSFNKGDILQVLSRaDGDWLRCSLGPDSGLVPIAYV 51

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 42.36 E-value: 2.74e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  336 KQIDSINGTLPSYQKTQEEEPQKKLPVTFED----KRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRE 411
Cdd:TIGR02169  258 EEISELEKRLEEIEQLLEELNKKIKDLGEEEqlrvKEKIGELEAEIASLERSIAEKERELEDAEERLAKLEAEIDKLLAE 337

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  412 LQEqewkkqleLEKRLEKQRElerqreeerrkeierrescisfplmREREWISVYKDRKGFMAELWK------PGSCAAK 485
Cdd:TIGR02169  338 IEE--------LEREIEEERK-------------------------RRDKLTEEYAELKEELEDLRAeleevdKEFAETR 384

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  486 QEL-ERQRRLEWERIRRQELLNQKNREQEEIVRLNSKKKSLHLELEAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQC 564
Cdd:TIGR02169  385 DELkDYREKLEKLKREINELKRELDRLQEELQRLSEELADLNAAIAGIEAKINELEEEKEDKALEIKKQEWKLEQLAADL 464

                          250       260
                   ....*....|....*....|.
gi 1958785258  565 DLEIMEIKQLQQELQEYQNKL 585
Cdd:TIGR02169  465 SKYEQELYDLKEEYDRVEKEL 485

First Src Homology 3 domain of Bud emergence protein 1 and similar domains; Members of this subfamily bear similarity to Saccharomyces cerevisiae Bem1p, containing two Src Homology 3 (SH3) domains at the N-terminus, a central PX domain, and a C-terminal PB1 domain. Bem1p is a scaffolding protein that is critical for proper Cdc42p activation during bud formation in yeast. During budding and mating, Bem1p migrates to the plasma membrane where it can serve as an adaptor for Cdc42p and some other proteins. Bem1p also functions as an effector of the G1 cyclin Cln3p and the cyclin-dependent kinase Cdc28p in promoting vacuolar fusion. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212811 [Multi-domain] Cd Length: 54 Bit Score: 37.27 E-value: 2.75e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258 1151 VI-AMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGE--INGVTGLFPSNY 1199
Cdd:cd11878      1 VIrALYDYRAQTPGELSFSKGDFFHVIGEEDQGeWYEATnpVTGKRGLVPKSY 53

EF-hand, calcium binding motif; A diverse superfamily of calcium sensors and calcium signal modulators; most examples in this alignment model have 2 active canonical EF hands. Ca2+ binding induces a conformational change in the EF-hand motif, leading to the activation or inactivation of target proteins. EF-hands tend to occur in pairs or higher copy numbers.

Pssm-ID: 238008 [Multi-domain] Cd Length: 63 Bit Score: 37.53 E-value: 2.78e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  248 KYRQKFNSLDKSMSGYLSGFQARNAL--LQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMH 308
Cdd:cd00051      1 ELREAFRLFDKDGDGTISADELKAALksLGEGLSEEEIDEMIREVDKDGDGKIDFEEFLELMA 63

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 37.45 E-value: 2.80e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258 1157 YIANNEDELNFSKGQLINVMNKDDPDWWQGEI--NGVTGLFPSNYVK 1201
Cdd:cd11785      8 YPPQSEAELELKEGDIVFVHKKREDGWFKGTLqrTGKTGLFPGSFVE 54

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 37.32 E-value: 2.81e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12077      4 VTVQPYTSQGKDEIGFEKGVTVEVIQKNLEGWWYIRYLGKEGWAPASYLK 53

Src Homology 3 domain of Melanoma Inhibitory Activity protein and similar proteins; MIA is a single domain protein that adopts a SH3 domain-like fold; it contains an additional antiparallel beta sheet and two disulfide bonds compared to classical SH3 domains. MIA is secreted from malignant melanoma cells and it plays an important role in melanoma development and invasion. MIA is expressed by chondrocytes in normal tissues and may be important in the cartilage cell phenotype. Unlike classical SH3 domains, MIA does not bind proline-rich ligands. MIA is a member of the recently identified family that also includes MIA-like (MIAL), MIA2, and MIA3 (also called TANGO); the biological functions of this family are not yet fully understood.

Pssm-ID: 212694 Cd Length: 76 Bit Score: 38.23 E-value: 2.87e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1146 HAVCQVIAMYDYIANNEDELNFSKGQLINVMNK---DDPDWWQGEINGVTGL---FPSNYVK 1201
Cdd:cd11760      9 NPISRARALEDYHGPDCRFLNFKKGDTIYVYSKlagERQDLWAGSVGGDAGLfgyFPKNLVQ 70

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 37.41 E-value: 2.93e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 970
Cdd:cd11866      3 MGLWDCSGNEPDELSFKRGDLIYIISKEYDsfgWWVGELNGKVGLVPKDYL 53

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 37.23 E-value: 3.06e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGElqaRGKKRQKGWFPASHVK 1132
Cdd:cd11939      3 QCVHPYVSQEPDELSLELADVLNILDKTDDGWIFGE---RLHDQERGWFPSSVVE 54

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 37.38 E-value: 3.07e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGelqaRGKKRQKGWFPASHVKL 1133
Cdd:cd11960      8 YQAADDTEISFDPGDIITDIEQIDEGWWRG----TGPDGTYGLFPANYVEL 54

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 37.66 E-value: 3.10e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1002 GEEYIALYSYSSVEPGDLTFTEGEELLVTQK-DGEWWTGSiGERT---GIFPSNYVR 1054
Cdd:cd11917      4 GEPFQALYNYMPRNEDELELREGDVIDVMEKcDDGWFVGT-SRRTkffGTFPGNYVK 59

Src homology 3 domain of RUN and SH3 domain-containing protein 1; RUSC1, also called NESCA (New molecule containing SH3 at the carboxy-terminus), is highly expressed in the brain and is translocated to the nuclear membrane from the cytoplasm upon stimulation with neurotrophin. It plays a role in facilitating neurotrophin-dependent neurite outgrowth. It also interacts with NEMO (or IKKgamma) and may function in NEMO-mediated activation of NF-kB. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212891 [Multi-domain] Cd Length: 51 Bit Score: 37.12 E-value: 3.14e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1151 VIAMYDYIANnEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11958      2 VRALCDHAGS-ESQLSFRKGEELQVLGTVDEDWIRCRRGDREGLVPVGY 49

Src Homology 3 domain of Bruton's tyrosine kinase; BTK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain with proline-rich and zinc-binding regions. Btk is expressed in B-cells, and a variety of myeloid cells including mast cells, platelets, neutrophils, and dendrictic cells. It interacts with a variety of partners, from cytosolic proteins to nuclear transcription factors, suggesting a diversity of functions. Stimulation of a diverse array of cell surface receptors, including antigen engagement of the B-cell receptor (BCR), leads to PH-mediated membrane translocation of Btk and subsequent phosphorylation by Src kinase and activation. Btk plays an important role in the life cycle of B-cells including their development, differentiation, proliferation, survival, and apoptosis. Mutations in Btk cause the primary immunodeficiency disease, X-linked agammaglobulinaemia (XLA) in humans. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212839 [Multi-domain] Cd Length: 55 Bit Score: 37.11 E-value: 3.20e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEE-LLVTQKDGEWWTGSIGE-RTGIFPSNYV 1053
Cdd:cd11906      4 VALYDYTPMNAQDLQLRKGEEyVILEESNLPWWRARDKNgREGYIPSNYV 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 37.50 E-value: 3.21e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1075 EIAQVTSAYAASGAEQLSLAPGQLILILKKNS--SGWWQGELQARgkkrqKGWFP 1127
Cdd:cd12056      2 EYCKALFHYEGTNEDELDFKEGEIILIISKDTgePGWWKGELNGK-----EGVFP 51

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 1, also called Insulin Receptor Tyrosine Kinase Substrate (IRTKS); BAIAP2L1 or IRTKS is widely expressed, serves as a substrate for the insulin receptor, and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. BAIAP2L1 expression leads to the formation of short actin bundles, distinct from filopodia-like protrusions induced by the expression of the related protein IRSp53. IRTKS mediates the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRTKS has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212846 Cd Length: 58 Bit Score: 37.20 E-value: 3.31e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1084 AASGAEQLSLAPGQ-LILILKKNSSGWWQGELQARGkkrQKGWFPASHVKL 1133
Cdd:cd11913     11 AGNNKTLLSFAQGDvITLLIPEEKDGWLYGEHDTTK---ARGWFPSSYTRP 58

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 37.02 E-value: 3.32e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1006 IALYSYSSVEPGDLTFTEGEELLV--TQKDGeWWTGSIGERTGIFPSNY 1052
Cdd:cd11797      3 VALYRFQALEPNELDFEVGDRIRIiaTLEDG-WLEGELKGRRGIFPHRF 50

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 37.25 E-value: 3.46e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd12054      2 QCKVLFEYVPQNEDELELKVGDIIDINEEvEEGWWSGTLNGKSGLFPSNFVK 53

Coiled-coil domain-containing protein 66; This protein family, named Coiled-coil domain-containing protein 66 (CCDC) refers to a protein domain found in eukaryotes, and is approximately 160 amino acids in length. CCDC66 protein is detected mainly in the inner segments of photoreceptors in many vertebrates including mice and humans. It has been found in dogs, that a mutation in the CCDC66 gene causes generalized progressive retinal atrophy (gPRA). This shows that the protein encoded for by this gene is vital for healthy vision and guards against photoreceptor cell degeneration. The structure of CCDC66 proteins includes a heptad repeat pattern which contains at least one coiled-coil domain. There are at least two or more alpha-helices which form a cable-like structure.

Pssm-ID: 434558 [Multi-domain] Cd Length: 154 Bit Score: 39.78 E-value: 3.49e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLpvtfEDKRKANyERGNMELEKRRQVLMEQQQREAERKAQKEKEE-WERKQRELQE-----QEWKKQLE 422
Cdd:pfam15236   63 KQLEEKERQKKL----EEERRRQ-EEQEEEERLRREREEEQKQFEEERRKQKEKEEaMTRKTQALLQamqkaQELAQRLK 137


                   ....
gi 1958785258  423 LEKR 426
Cdd:pfam15236  138 QEQR 141

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 37.24 E-value: 3.54e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITV-LEQQENWWFGEVHGG---RGWFPKSYV 970
Cdd:cd11966      1 RVKALYNCVADNPDELTFSEGEIIIVdGEEDKEWWIGHIDGEptrRGAFPVSFV 54

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 37.30 E-value: 3.59e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVK-LLGPS 1137
Cdd:cd11972     11 YTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNG-----VTGLFPGNYVEsIMHYS 61

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 37.06 E-value: 3.73e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1078 QVTSAYAASGAEQLSLAPGQLILILKKNSSGWWQGELQARGKkrqKGWFPASHVK 1132
Cdd:cd11785      3 RVIVPYPPQSEAELELKEGDIVFVHKKREDGWFKGTLQRTGK---TGLFPGSFVE 54

phosphodiesterase; Provisional

Pssm-ID: 237177 [Multi-domain] Cd Length: 520 Bit Score: 41.69 E-value: 3.74e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  681 LKELRESYNTQQLALEQLHKIKRDKLKELErKRLEQiQKKKLEDEaarkakqgkenlwKESIRKEEEEKQKRLQE-EKSQ 759
Cdd:PRK12704    59 LLEAKEEIHKLRNEFEKELRERRNELQKLE-KRLLQ-KEENLDRK-------------LELLEKREEELEKKEKElEQKQ 123

                           90       100       110
                   ....*....|....*....|....*....|....
gi 1958785258  760 DRTQEEERKTEAKQSETARALVNYRALYPFEARN 793
Cdd:PRK12704   124 QELEKKEEELEELIEEQLQELERISGLTAEEAKE 157

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 37.09 E-value: 3.76e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGD---IIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 836
Cdd:cd12141      2 YYAVYTFKARSPNELSVSANQrvrILEFSDLT-GNKEWWLAEANGQKGYVPSNYIRK 57

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 37.30 E-value: 3.96e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWF-GEVHGGRGWFPKSYVKIIPG 975
Cdd:cd11972      4 KVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYeGVMNGVTGLFPGNYVESIMH 59

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 37.13 E-value: 3.97e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNYVK 1201
Cdd:cd12022      3 ITIKAYTAVEEDELTLLEGEAIEVIHKLLDGWWVVRKGEVTGYFPSMYLQ 52

Src Homology 3 domain of Class A Dedicator of Cytokinesis proteins 1 and 5; Dock1, also called Dock180, and Dock5 are class A DOCKs and are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. Dock1 interacts with the scaffold protein Elmo and the resulting complex functions upstream of Rac in many biological events including phagocytosis of apoptotic cells, cell migration and invasion. Dock5 functions upstream of Rac1 to regulate osteoclast function. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. Class A DOCKs also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus; they are specific GEFs for Rac. The SH3 domain of Dock1 binds to DHR-2 in an autoinhibitory manner; binding of Elmo to the SH3 domain of Dock1 exposes the DHR-2 domain and promotes GEF activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212984 [Multi-domain] Cd Length: 56 Bit Score: 37.11 E-value: 4.02e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKkNSSGWWQGelQARGKKRQKGWFPASHVKL 1133
Cdd:cd12051      8 YDARGPDELSLQIGDTVHILE-TYEGWYRG--YTLRKKSKKGIFPASYIHL 55

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 37.09 E-value: 4.06e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEEL-LVTQKDGEWWTGSIGERTGIFPSNYVR 1054
Cdd:cd11869      4 ALFDFTGNSKLELNFKAGDVIfLLSRVNKDWLEGTVRGATGIFPLSFVK 52

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 37.11 E-value: 4.07e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*...
gi 1958785258  924 ALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYV 970
Cdd:cd12047      4 AQHDYSAQGPEDLEFSQGDTIDILsEVNQEWLEGHCDGRIGIFPKCFA 51

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 36.71 E-value: 4.26e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTvGEPGWLyGSFQGKFGWFPCNYVE 835
Cdd:cd11813      3 KALLDFERHDDDELGFRKNDIITIISQK-DEHCWV-GELNGLRGWFPAKFVE 52

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 36.96 E-value: 4.29e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1082 AYAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHVK 1132
Cdd:cd11786      7 NYEGKEPGDLSFKKGDIILLRKRIDENWYHGECNG-----KQGFFPASYVQ 52

Src Homology 3 domain of Saccharomyces cerevisiae Nap1-binding protein 2 and similar fungal proteins; This subfamily includes Saccharomyces cerevisiae Nbp2 (Nucleosome assembly protein 1 (Nap1)-binding protein 2), Schizosaccharomyces pombe Skb5, and similar proteins. Nbp2 interacts with Nap1, which is essential for maintaining proper nucleosome structures in transcription and replication. It is also the binding partner of the yeast type II protein phosphatase Ptc1p and serves as a scaffolding protein that brings seven kinases in close contact to Ptc1p. Nbp2 plays a role many cell processes including organelle inheritance, mating hormone response, cell wall stress, mitotic cell growth at elevated temperatures, and high osmolarity. Skb5 interacts with the p21-activated kinase (PAK) homolog Shk1, which is critical for fission yeast cell viability. Skb5 activates Shk1 and plays a role in regulating cell morphology and growth under hypertonic conditions. Nbp2 and Skb5 contain an SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212799 Cd Length: 55 Bit Score: 36.73 E-value: 4.35e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWW--QGEINGVTGLFPSNYVKM 1202
Cdd:cd11865      1 RAVALYDFEPEHDNELGFAEGQILFILYKHGQGWLiaEDESGGKTGLVPEEFVSY 55

Src Homology 3 domain of Cdc42-Interacting Protein 4, Bzz1 and similar domains; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4) and similar proteins such as Formin Binding Protein 17 (FBP17) and FormiN Binding Protein 1-Like (FNBP1L), as well as yeast Bzz1 (or Bzz1p). CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. Bzz1 is also a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Members of this subfamily contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain as well as at least one C-terminal SH3 domain. Bzz1 contains a second SH3 domain at the C-terminus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212711 [Multi-domain] Cd Length: 55 Bit Score: 36.82 E-value: 4.37e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQ--GEINGVTGLFPSNYVKM 1202
Cdd:cd11777      1 ECKALYAFVGSSEGTISMTEGEKLSLVEEDKGDGWTrvRRDTGEEGYVPTSYIRI 55

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 36.74 E-value: 4.43e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELqarGKKRQKgWFPASHVK 1132
Cdd:cd11969      8 YRAKRSDELSFCKGALIHNVSKETGGWWKGDY---GGKVQH-YFPSNYVE 53

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 37.15 E-value: 4.51e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258 1152 IAMYDYIANNEDELNFSKGQLINVMNKDDpDWWQ----GEINGVT--GLFPSNYV 1200
Cdd:cd11847      3 KALWDFKARGDEELSFQAGDQFRIAERSG-DWWTalklDRAGGVVaqGFVPNNYL 56

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 36.52 E-value: 4.84e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGR-GWFPKSYVK 971
Cdd:cd11849      3 RALYDFKSAEPNTLSFSEGETFLLLERsNAHWWLVTNHSGEtGYVPANYVK 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 36.73 E-value: 4.85e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVKI 972
Cdd:cd12056      5 KALFHYEGTNEDELDFKEGEIILIISKdtgEPGWWKGELNGKEGVFPDNFVSQ 57

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 41.18 E-value: 5.03e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  682 KELRESYNTQQLALEQLHKI--KRDKLKELERKRLEQIQKKKLED-----EAARKAKQGKENLWKESIRKEEEEKQKRLQ 754
Cdd:COG3064      2 QEALEEKAAEAAAQERLEQAeaEKRAAAEAEQKAKEEAEEERLAEleakrQAEEEAREAKAEAEQRAAELAAEAAKKLAE 81

                           90       100
                   ....*....|....*....|....*
gi 1958785258  755 EEKSQDRTQEEERKTEAKQSETARA 779
Cdd:COG3064     82 AEKAAAEAEKKAAAEKAKAAKEAEA 106

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 36.80 E-value: 5.06e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd12045      2 YQGLWDCTGDQPDELSFKRGDTIYILSKEYNRFGWWVGEMKGTIGLVPKAYI 53

calmodulin; Provisional

Pssm-ID: 185504 [Multi-domain] Cd Length: 149 Bit Score: 39.36 E-value: 5.26e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  248 KYRQKFNSLDKSMSGYLSGFQARNAL--LQSNLSQTQLATIWTLADIDGDGQLKAEEFILAM 307
Cdd:PTZ00184    85 EIKEAFKVFDRDGNGFISAAELRHVMtnLGEKLTDEEVDEMIREADVDGDGQINYEEFVKMM 146

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 41.49 E-value: 5.36e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  367 KRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEIE 446
Cdd:TIGR00618  437 QRYAELCAAAITCTAQCEKLEKIHLQESAQSLKEREQQLQTKEQIHLQETRKKAVVLARLLELQEEPCPLCGSCIHPNPA 516

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  447 RRESCISFPLMREREWIsVYKDRKGfmaelwkpgscaaKQELERQR-RLEWERIRRQELLNQKNREQEEIVRLNSKKKSL 525
Cdd:TIGR00618  517 RQDIDNPGPLTRRMQRG-EQTYAQL-------------ETSEEDVYhQLTSERKQRASLKEQMQEIQQSFSILTQCDNRS 582

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  526 HLELEAVngkhQQISGRLQD-----VRIRKQT---QKTELEVLDKQCDLEIMEIKQLQQELQEYQNKLIYLVPEKQLLNE 597
Cdd:TIGR00618  583 KEDIPNL----QNITVRLQDlteklSEAEDMLaceQHALLRKLQPEQDLQDVRLHLQQCSQELALKLTALHALQLTLTQE 658

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  598 RIKNMQLSNTPDSGISLLHKKSSEKEElcQRLKEQLDALEKETASKLSEMDSFNNQLKcgnmddsvlqcllsllsclnNL 677
Cdd:TIGR00618  659 RVREHALSIRVLPKELLASRQLALQKM--QSEKEQLTYWKEMLAQCQTLLRELETHIE--------------------EY 716

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  678 FLLLKELRESYNTQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKE--SIRKEEEEKQKRLQE 755
Cdd:TIGR00618  717 DREFNEIENASSSLGSDLAAREDALNQSLKELMHQARTVLKARTEAHFNNNEEVTAALQTGAElsHLAAEIQFFNRLREE 796

                          410       420
                   ....*....|....*....|....*
gi 1958785258  756 EKSQDRTQEEERKTEAKQSETARAL 780
Cdd:TIGR00618  797 DTHLLKTLEAEIGQEIPSDEDILNL 821

EF-hand, calcium binding motif, found in homologs of mammalian apoptosis-linked gene 2 protein (ALG-2); The family includes some homologs of mammalian apoptosis-linked gene 2 protein (ALG-2) mainly found in lower eukaryotes, such as a parasitic protist Leishmarua major and a cellular slime mold Dictyostelium discoideum. These homologs contains five EF-hand motifs. Due to the presence of unfavorable residues at the Ca2+-coordinating positions, their non-canonical EF4 and EF5 hands may not bind Ca2+. Two Dictyostelium PEF proteins are the prototypes of this family. They may bind to cytoskeletal proteins and/or signal-transducing proteins localized to detergent-resistant membranes named lipid rafts, and occur as monomers or weak homo- or heterodimers like ALG-2. They can serve as a mediator for Ca2+ signaling-related Dictyostehum programmed cell death (PCD).

Pssm-ID: 320060 [Multi-domain] Cd Length: 163 Bit Score: 39.51 E-value: 5.37e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258  250 RQKFNSLDKSMSGYLSGFQARNALLQSNL--SQTQLATIWTLADIDGDGQLKAEEFiLAMH--LTDM 312
Cdd:cd16185      3 RQWFRAVDRDRSGSIDVNELQKALAGGGLlfSLATAEKLIRMFDRDGNGTIDFEEF-AALHqfLSNM 68

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 36.69 E-value: 5.46e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVH---GGRGWFPKSYVK 971
Cdd:cd11940      3 QCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEGVRlsdGERGWFPQSHVE 54

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 41.70 E-value: 5.51e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  350 KTQEEEPQKKLPVTfEDKR----------KANYERG-----NMELEKRRQVLMEQQQREAERkaqkekeEWERKQRElQE 414
Cdd:pfam01576  698 KTQLEELEDELQAT-EDAKlrlevnmqalKAQFERDlqardEQGEEKRRQLVKQVRELEAEL-------EDERKQRA-QA 768

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  415 QEWKKQLELE-KRLEKQRElerqreeerrkeierrescisfplmrerewiSVYKDRKGFMAELWKpgscAAKQELERQRR 493
Cdd:pfam01576  769 VAAKKKLELDlKELEAQID-------------------------------AANKGREEAVKQLKK----LQAQMKDLQRE 813

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  494 LEWERIRRQELLNQkNREQEEivrlnsKKKSLHLEL----------EAVNGKHQQISGRLQDVRIRKQTQKTELEVLDKQ 563
Cdd:pfam01576  814 LEEARASRDEILAQ-SKESEK------KLKNLEAELlqlqedlaasERARRQAQQERDELADEIASGASGKSALQDEKRR 886

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  564 CDLEIMEIKQLQQELQEYQnkliylvpekQLLNERIKNMQLSNTpdsgiSLLHKKSSEKEeLCQRL---KEQLDALEKET 640
Cdd:pfam01576  887 LEARIAQLEEELEEEQSNT----------ELLNDRLRKSTLQVE-----QLTTELAAERS-TSQKSesaRQQLERQNKEL 950

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  641 ASKLSEMDSfnnqlkcgnmddsvlqcllsllsclnnlflllkELRESYNTQQLALEQlhkikrdKLKELErkrlEQIQKK 720
Cdd:pfam01576  951 KAKLQEMEG---------------------------------TVKSKFKSSIAALEA-------KIAQLE----EQLEQE 986

                          410       420       430       440       450       460       470
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  721 KLEDEAARKAKQGKENLWKESIRKEEEEK----QKRLQEEKSQDRTQEEERKTEAKQSETARALVNYRAL 786
Cdd:pfam01576  987 SRERQAANKLVRRTEKKLKEVLLQVEDERrhadQYKDQAEKGNSRMKQLKRQLEEAEEEASRANAARRKL 1056

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 36.79 E-value: 5.65e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDEKTVGE-PGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12003      4 KALYDNAAESPEELSFRRGDVLMVLKREHGSlPGWWLCSLHGQQGIAPANRLR 56

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 36.53 E-value: 5.70e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  922 AQALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVK 971
Cdd:cd11977      3 AVARYNFAARDMRELSLREGDVVRIYSRiggDQGWWKGETNGRIGWFPSTYVE 55

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 36.37 E-value: 5.81e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 834
Cdd:cd12044      2 YQGLWDCFGDNPDELSFQRGDLIYILSKEYNMYGWWVGELNGIVGIVPKDYL 53

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 39.25 E-value: 6.01e-03

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  710 ERKRLEQIQKKKLEDEaaRKAKQGKENLWKESIRKEEEEKQKRLQEE----KSQDRTQEEERKTEAKQSETARAL 780
Cdd:pfam05672   18 EKRRQAREQREREEQE--RLEKEEEERLRKEELRRRAEEERARREEEarrlEEERRREEEERQRKAEEEAEEREQ 90

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 36.25 E-value: 6.36e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1151 VIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd11797      2 GVALYRFQALEPNELDFEVGDRIRIIATLEDGWLEGELKGRRGIFPHRF 50

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 41.09 E-value: 6.46e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  685 RESYNTQQLALEQLHKIKRDKlKELE---RKRLEQIQ--KKKLEDEAARKAKQGK-----ENLWKESIRKEEEEKQKRLQ 754
Cdd:pfam15709  355 REQEEQRRLQQEQLERAEKMR-EELEleqQRRFEEIRlrKQRLEEERQRQEEEERkqrlqLQAAQERARQQQEEFRRKLQ 433

                           90
                   ....*....|....*....
gi 1958785258  755 EEKSQDRTQEEERKTEAKQ 773
Cdd:pfam15709  434 ELQRKKQQEEAERAEAEKQ 452

Src Homology 3 domain of Sorting Nexin 33; SNX33 interacts with Wiskott-Aldrich syndrome protein (WASP) and plays a role in the maintenance of cell shape and cell cycle progression. It modulates the shedding and endocytosis of cellular prion protein (PrP(c)) and amyloid precursor protein (APP). SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX33 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212829 [Multi-domain] Cd Length: 55 Bit Score: 36.48 E-value: 6.67e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|..
gi 1958785258 1153 AMYDYIANNEDELNFSKGQLINVMNKDDPD-WWQGEIN-GVTGLFPSNYVKM 1202
Cdd:cd11896      4 ALYSFQSENKEEINIQENEELVIFSENSLDgWLQGQNSrGETGLFPASYVEI 55

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 36.51 E-value: 6.71e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSF--QGKFGWFPCNYV 834
Cdd:cd11925      3 YLALYAYKPQKNDELELRKGEMYRVIEKC--QDGWFKGTSlrTGVSGVFPGNYV 54

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 38.87 E-value: 6.73e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLPVTfEDKRKANYERGNME-----LEKRRQVLMEQQQREAERKA--------------QKEKEEWERKQ 409
Cdd:pfam05672   32 QERLEKEEEERLRKE-ELRRRAEEERARREeearrLEEERRREEEERQRKAEEEAeereqreqeeqerlQKQKEEAEAKA 110

                           90       100
                   ....*....|....*....|
gi 1958785258  410 RELQEQewkKQLELEKRLEK 429
Cdd:pfam05672  111 REEAER---QRQEREKIMQQ 127

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 36.50 E-value: 7.08e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1007 ALYSYSSVEPGDLTFTEGEELL-VTQKDGEWWTGSIGERTGI-FPSNYV 1053
Cdd:cd11970      8 ALFDYKAQREDELTFTKNAIIQnVEKQEGGWWRGDYGGKKQLwFPSNYV 56

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 40.60 E-value: 7.18e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  349 QKTQEEEPQKKLpvtfedKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEeweRKQRELQEQEWKKQLELEKRLE 428
Cdd:TIGR02794   83 QRAAEQARQKEL------EQRAAAEKAAKQAEQAAKQAEEKQKQAEEAKAKQAAE---AKAKAEAEAERKAKEEAAKQAE 153


                   .
gi 1958785258  429 K 429
Cdd:TIGR02794  154 E 154

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 41.28 E-value: 7.30e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  686 ESYNTQQLALEQLHKIKRDKLKElERKRLEQiqKKKLED----EAARKAKQGKEnlwKESIRKEEEEKQKRLQEEKSQDR 761
Cdd:PTZ00121  1091 EATEEAFGKAEEAKKTETGKAEE-ARKAEEA--KKKAEDarkaEEARKAEDARK---AEEARKAEDAKRVEIARKAEDAR 1164

                           90       100
                   ....*....|....*....|....
gi 1958785258  762 TQEEERKTE-AKQSETARALVNYR 784
Cdd:PTZ00121  1165 KAEEARKAEdAKKAEAARKAEEVR 1188

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 36.24 E-value: 7.31e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGElqARGkkrQKGWFPASHVKL 1133
Cdd:cd11959      8 YQAADDDEISFDPDDIITNIEMIDEGWWRGV--CRG---KYGLFPANYVEL 53

Src homology 3 domain of Srms Protein Tyrosine Kinase; Src-related kinase lacking C-terminal regulatory tyrosine and N-terminal myristoylation sites (Srms) is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Srms lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212780 Cd Length: 55 Bit Score: 36.29 E-value: 7.50e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258 1005 YIALYSYSSVEPGDLTFTEGEELLVTQKDGEW-----WTGSIgeRTGIFPSNYV 1053
Cdd:cd11846      2 FTALYDFTARSTHELSVEQGDKLCVIEEEGDYifarkLTGNP--ESGLVPASYV 53

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 35.99 E-value: 7.81e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  923 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 970
Cdd:cd12044      3 QGLWDCFGDNPDELSFQRGDLIYILSKEYNmygWWVGELNGIVGIVPKDYL 53

recombination and DNA strand exchange inhibitor protein; Reviewed

Pssm-ID: 234750 [Multi-domain] Cd Length: 782 Bit Score: 40.97 E-value: 8.05e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  380 EKRRQvlMEQQQREAE---RKAQKEKEEWERKQRELQEQEWKKQLELEKRLEK 429
Cdd:PRK00409   527 ELERE--LEQKAEEAEallKEAEKLKEELEEKKEKLQEEEDKLLEEAEKEAQQ 577

Src Homology 3 domain of fungal BOI-like proteins; This subfamily includes the Saccharomyces cerevisiae proteins BOI1 and BOI2, and similar proteins. They contain an N-terminal SH3 domain, a Sterile alpha motif (SAM), and a Pleckstrin homology (PH) domain at the C-terminus. BOI1 and BOI2 interact with the SH3 domain of Bem1p, a protein involved in bud formation. They promote polarized cell growth and participates in the NoCut signaling pathway, which is involved in the control of cytokinesis. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212819 Cd Length: 55 Bit Score: 36.16 E-value: 8.09e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQV--DEKTVGEpGWLYGS--FQGKFGWFPCNY 833
Cdd:cd11886      2 LIVIHDFNARSEDELTLKPGDKIELieDDEEFGD-GWYLGRnlRTGETGLFPVVF 55

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 40.21 E-value: 8.11e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  696 EQLHKIKRDKLKELERKRLEQIQKKKLED-----------EAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQE 764
Cdd:TIGR02794   68 ERQKKLEQQAEEAEKQRAAEQARQKELEQraaaekaakqaEQAAKQAEEKQKQAEEAKAKQAAEAKAKAEAEAERKAKEE 147

                           90
                   ....*....|....*
gi 1958785258  765 EERKTEAKQSETARA 779
Cdd:TIGR02794  148 AAKQAEEEAKAKAAA 162

Second or C-terminal Src homology 3 domain of NADPH oxidase (Nox) Organizing protein 1; Nox Organizing protein 1 (NoxO1) is a critical regulator of enzyme kinetics of the nonphagocytic NADPH oxidase Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Nox1 is expressed in colon, stomach, uterus, prostate, and vascular smooth muscle cells. NoxO1 is involved in targeting activator subunits (such as NoxA1) to Nox1. It is co-localized with Nox1 in the membranes of resting cells and directs the subcellular localization of Nox1. NoxO1 contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of NoxO1. The tandem SH3 domains of NoxO1 interact with the PRR of p22phox, which also complexes with Nox1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212957 Cd Length: 53 Bit Score: 36.16 E-value: 8.13e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 1958785258  783 YRALYPFEARNHDEMSFNSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNY 833
Cdd:cd12024      2 YYATRAYEAQKEDELSVPAGVVVEVLQKS--DNGWWLIRYNGRAGYVPSMY 50

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 36.20 E-value: 8.19e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  783 YRALYPFEAR----NHD---EMSFNSGDIIQVdEKTVGEPGWLYGSFQGKFGWFPCNYVE 835
Cdd:cd12013      2 MVALFDYDPResspNVDaevELSFRAGDIITV-FGEMDEDGFYYGELNGQRGLVPSNFLE 60

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 35.89 E-value: 8.19e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 1958785258 1083 YAASGAEQLSLAPGQLILILKKNSSGWWQGELQArgkkrQKGWFPASHV 1131
Cdd:cd12017      8 FQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDG-----KEGWAPSSYI 51

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 36.63 E-value: 8.52e-03

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 1958785258  772 KQSETARALVNYRALYPfearnhDEMSFNSGDIIQVDEKTVGepGWLYGSFQGK-----FGWFPCNYVeKMLS 839
Cdd:cd11993      1 KKPEIAQVIASYTATGP------EQLTLAPGQLILIRKKNPG--GWWEGELQARgkkrqIGWFPANYV-KLLS 64

Src Homology 3 domain of Sorting Nexin 33; SNX33 interacts with Wiskott-Aldrich syndrome protein (WASP) and plays a role in the maintenance of cell shape and cell cycle progression. It modulates the shedding and endocytosis of cellular prion protein (PrP(c)) and amyloid precursor protein (APP). SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX33 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212829 [Multi-domain] Cd Length: 55 Bit Score: 36.09 E-value: 8.53e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQV-DEKTVGepGWLYG-SFQGKFGWFPCNYVE 835
Cdd:cd11896      3 RALYSFQSENKEEINIQENEELVIfSENSLD--GWLQGqNSRGETGLFPASYVE 54

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 36.17 E-value: 9.03e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*.
gi 1958785258  921 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEV---HGGR--GWFPKSYV 970
Cdd:cd11887      3 KVKALYPYESDHEDDLNFDVGQLITVTEEEdADWYFGEYvdsNGNTkeGIFPKNFV 58

Src homology 3 domain of Disks Large homolog 5; DLG5 is a multifunctional scaffold protein that is located at sites of cell-cell contact and is involved in the maintenance of cell shape and polarity. Mutations in the DLG5 gene are associated with Crohn's disease (CD) and inflammatory bowel disease (IBD). DLG5 is a member of the MAGUK (membrane-associated guanylate kinase) protein family, which is characterized by the presence of a core of three domains: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. DLG5 contains 4 PDZ domains as well as an N-terminal domain of unknown function. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212794 Cd Length: 63 Bit Score: 36.16 E-value: 9.12e-03

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 1958785258  784 RALYPFEARNHDEMSFNSGDIIQVDeKTVgepgwlygsFQGKFG-WF 829
Cdd:cd11860      3 RALFDRSAENEDELSFKKDDILYVD-NTM---------FNGVFGqWR 39

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 40.21 E-value: 9.24e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  690 TQQLALEQLHKIKRDKLKELERKRLEQIQKKKLEDE---AARKAKQGKENLWK---ESIRKEEEEKQKRLQEEKSQDRTQ 763
Cdd:TIGR02794   83 QRAAEQARQKELEQRAAAEKAAKQAEQAAKQAEEKQkqaEEAKAKQAAEAKAKaeaEAERKAKEEAAKQAEEEAKAKAAA 162

                           90
                   ....*....|....*....
gi 1958785258  764 EEERKTE---AKQSETARA 779
Cdd:TIGR02794  163 EAKKKAEeakKKAEAEAKA 181

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

Pssm-ID: 466641 [Multi-domain] Cd Length: 120 Bit Score: 37.59 E-value: 9.42e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  682 KELRESYNTQQLALEQLHKIKRDKlKELERKRLEQIQ-KKKLEDEAARKAKQgKENLWKEsiRKEEEEKQKRLQEEKsqd 760
Cdd:pfam20492   27 EELEESEETAEELEEERRQAEEEA-ERLEQKRQEAEEeKERLEESAEMEAEE-KEQLEAE--LAEAQEEIARLEEEV--- 99

                           90
                   ....*....|....*...
gi 1958785258  761 RTQEEERKTEAKQSETAR 778
Cdd:pfam20492  100 ERKEEEARRLQEELEEAR 117

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 35.86 E-value: 9.44e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|
gi 1958785258 1150 QVIAMYDYIANNEDELNFSKGQLINVMNKDDPDWWQGEINGVTGLFPSNY 1199
Cdd:cd12015      1 QYVVVADYKKQQPNEISLRAGDVVDVIEKNENGWWFVSLEDEQGWVPATY 50

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 40.81 E-value: 9.58e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  500 RRQELLNQKNREQEEIVR-------LNSKKKSLHLELEAVngkhqqisgrlqdvrIRKQTQKTELEVLDKqcDLEIMEIK 572
Cdd:TIGR02168  173 RRKETERKLERTRENLDRledilneLERQLKSLERQAEKA---------------ERYKELKAELRELEL--ALLVLRLE 235

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  573 QLQQELQEYQNKLIYLVPEKQLLNERIKNMQLS-NTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFN 651
Cdd:TIGR02168  236 ELREELEELQEELKEAEEELEELTAELQELEEKlEELRLEVSELEEEIEELQKELYALANEISRLEQQKQILRERLANLE 315

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  652 NQLKCGNMDDSVLQCLlsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKELERKR-LEQIQKKKLED------ 724
Cdd:TIGR02168  316 RQLEELEAQLEELESK-------------LDELAEELAELEEKLEELKEELESLEAELEELEaELEELESRLEEleeqle 382

                          250       260       270       280       290
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 1958785258  725 EAARKAKQGKENLwkESIRKEEEEKQKRLQE-EKSQDRTQEEERKTEAKQSETARALV 781
Cdd:TIGR02168  383 TLRSKVAQLELQI--ASLNNEIERLEARLERlEDRRERLQQEIEELLKKLEEAELKEL 438

Chromatin assembly factor 1 complex p150 subunit, N-terminal; CAF-1_p150 is a polypeptide subunit of CAF-1, which functions in depositing newly synthesized and acetylated histones H3/H4 into chromatin during DNA replication and repair. CAF-1_p150 includes the HP1 interaction site, the PEST, KER and ED interacting sites. CAF-1_p150 interacts directly with newly synthesized and acetylated histones through the acidic KER and ED domains. The PEST domain is associated with proteins that undergo rapid proteolysis.

Pssm-ID: 402959 [Multi-domain] Cd Length: 164 Bit Score: 38.52 E-value: 9.67e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958785258  696 EQLHKIKRDKLKELERKRLEQIQKKKLEDEAARKAKQGKENLWKESIRKEEEEKQKRLQEEKSQDRTQEEERKTEAKQSE 775
Cdd:pfam11600   11 EEKEKQRLEKDKERLRRQLKLEAEKEEKERLKEEAKAEKERAKEEARRKKEEEKELKEKERREKKEKDEKEKAEKLRLKE 90


                   ...
gi 1958785258  776 TAR 778
Cdd:pfam11600   91 EKR 93

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 35.90 E-value: 9.85e-03

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 1958785258 1078 QVTSAYAASGAE--QLSLAPGQLILILKKNSSGWWQGELQargkkRQKGWFPASHVK 1132
Cdd:cd11820      2 KVRALYDFEAAEdnELTFKAGEIITVLDDSDPNWWKGSNH-----RGEGLFPANFVT 53