Stromal membrane-associated proteins; a subfamily of the ArfGAP family; The SMAP subfamily of Arf GTPase-activating proteins consists of the two structurally-related members, SMAP1 and SMAP2. Each SMAP member exhibits common and distinct functions in vesicle trafficking. They both bind to clathrin heavy chain molecules and are involved in the trafficking of clathrin-coated vesicles. SMAP1 preferentially exhibits GAP toward Arf6, while SMAP2 prefers Arf1 as a substrate. SMAP1 is involved in Arf6-dependent vesicle trafficking, but not Arf6-mediated actin cytoskeleton reorganization, and regulates clathrin-dependent endocytosis of the transferrin receptors and E-cadherin. SMAP2 regulates Arf1-dependent retrograde transport of TGN38/46 from the early endosome to the trans-Golgi network (TGN). SMAP2 has the Clathrin Assembly Lymphoid Myeloid (CALM)-binding domain, but SMAP1 does not.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  20 LLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEH 99
Cdd:cd08839   1 LAKLLREEDNKYCADCGAKGPRWASWNLGVFICIRCAGIHRNLGVHISKVKSVNLDSWTPEQVQSMQEMGNARANAYYEA 80

                        90       100
                ....*....|....*....|...
gi 17555530 100 DLPAQFRRPTNDQQMEQFIRSKY 122
Cdd:cd08839  81 NLPDGFRRPQTDSALENFIRDKY 103

Stromal membrane-associated proteins; a subfamily of the ArfGAP family; The SMAP subfamily of Arf GTPase-activating proteins consists of the two structurally-related members, SMAP1 and SMAP2. Each SMAP member exhibits common and distinct functions in vesicle trafficking. They both bind to clathrin heavy chain molecules and are involved in the trafficking of clathrin-coated vesicles. SMAP1 preferentially exhibits GAP toward Arf6, while SMAP2 prefers Arf1 as a substrate. SMAP1 is involved in Arf6-dependent vesicle trafficking, but not Arf6-mediated actin cytoskeleton reorganization, and regulates clathrin-dependent endocytosis of the transferrin receptors and E-cadherin. SMAP2 regulates Arf1-dependent retrograde transport of TGN38/46 from the early endosome to the trans-Golgi network (TGN). SMAP2 has the Clathrin Assembly Lymphoid Myeloid (CALM)-binding domain, but SMAP1 does not.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  20 LLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEH 99
Cdd:cd08839   1 LAKLLREEDNKYCADCGAKGPRWASWNLGVFICIRCAGIHRNLGVHISKVKSVNLDSWTPEQVQSMQEMGNARANAYYEA 80

                        90       100
                ....*....|....*....|...
gi 17555530 100 DLPAQFRRPTNDQQMEQFIRSKY 122
Cdd:cd08839  81 NLPDGFRRPQTDSALENFIRDKY 103

Putative GTP-ase activating proteins for the small GTPase, ARF; Putative zinc fingers with GTPase activating proteins (GAPs) towards the small GTPase, Arf. The GAP of ARD1 stimulates GTPase hydrolysis for ARD1 but not ARFs.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530     21 LDML-KEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEH 99
Cdd:smart00105   1 LKLLrSIPGNKKCFDCGAPNPTWASVNLGVFLCIECSGIHRSLGVHISKVRSLTLDTWTEEELRLLQKGGNENANSIWES 80

                           90       100       110
                   ....*....|....*....|....*....|....*
gi 17555530    100 DLPAQFRRPTND---QQMEQFIRSKYEQKRYILRD 131
Cdd:smart00105  81 NLDDFSLKPPDDddqQKYESFIAAKYEEKLFVPPE 115

ADP-ribosylation factor GTPase-activating protein AGD10; Provisional

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 17555530   26 EEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEH 99
Cdd:PLN03114  19 KSDNKICFDCNAKNPTWASVTYGIFLCIDCSAVHRSLGVHISFVRSTNLDSWSSEQLKMMIYGGNNRAQVFFKQ 92

Stromal membrane-associated proteins; a subfamily of the ArfGAP family; The SMAP subfamily of Arf GTPase-activating proteins consists of the two structurally-related members, SMAP1 and SMAP2. Each SMAP member exhibits common and distinct functions in vesicle trafficking. They both bind to clathrin heavy chain molecules and are involved in the trafficking of clathrin-coated vesicles. SMAP1 preferentially exhibits GAP toward Arf6, while SMAP2 prefers Arf1 as a substrate. SMAP1 is involved in Arf6-dependent vesicle trafficking, but not Arf6-mediated actin cytoskeleton reorganization, and regulates clathrin-dependent endocytosis of the transferrin receptors and E-cadherin. SMAP2 regulates Arf1-dependent retrograde transport of TGN38/46 from the early endosome to the trans-Golgi network (TGN). SMAP2 has the Clathrin Assembly Lymphoid Myeloid (CALM)-binding domain, but SMAP1 does not.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  20 LLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEH 99
Cdd:cd08839   1 LAKLLREEDNKYCADCGAKGPRWASWNLGVFICIRCAGIHRNLGVHISKVKSVNLDSWTPEQVQSMQEMGNARANAYYEA 80

                        90       100
                ....*....|....*....|...
gi 17555530 100 DLPAQFRRPTNDQQMEQFIRSKY 122
Cdd:cd08839  81 NLPDGFRRPQTDSALENFIRDKY 103

Putative GTPase activating protein for Arf; Putative zinc fingers with GTPase activating proteins (GAPs) towards the small GTPase, Arf. The GAP of ARD1 stimulates GTPase hydrolysis for ARD1 but not ARFs.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530    19 FLLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYE 98
Cdd:pfam01412   3 VLRELLKLPGNKVCADCGAPNPTWASVNLGIFICIDCSGVHRSLGVHISKVRSLTLDTWTDEQLELMKAGGNDRANEFWE 82

                          90       100       110
                  ....*....|....*....|....*....|....*
gi 17555530    99 HDLPAQFRRP--TNDQQMEQFIRSKYEQKRYILRD 131
Cdd:pfam01412  83 ANLPPSYKPPpsSDREKRESFIRAKYVEKKFAKPG 117

ArfGap with dual PH domains; The ADAP subfamily, ArfGAPs with dual pleckstrin homology (PH) domains, includes two members: ADAP1 and ADAP2. Both ADAP1 (also known as centaurin-alpha1, p42(IP4), or PIP3BP) and ADAP2 (centaurin-alpha2) display a GTPase-activating protein (GAP) activity toward Arf6 (ADP-ribosylation factor 6), which is involved in protein trafficking that regulates endocytic recycling, cytoskeleton remodeling, and neuronal differentiation. ADAP2 has high sequence similarity to the ADAP1 and they both contain a ArfGAP domain at the N-terminus, followed by two PH domains. However, ADAP1, unlike ADAP2, contains a putative N-terminal nuclear localization signal. The PH domains of ADAP1bind to the two second messenger molecules phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3) and inositol 1,3,4,5-tetrakisphosphate (I(1,3,4,5)P4) with identical high affinity, whereas those of ADAP2 specifically binds phosphatidylinositol 3,4-bisphosphate (PI(3,4)P2) and PI(3,4,5)P3, which are produced by activated phosphatidylinositol 3-kinase. ADAP1 is predominantly expressed in the brain neurons, while ADAP2 is broadly expressed, including the adipocytes, heart, and skeletal muscle but not in the brain. The limited distribution and high expression of ADAP1 in the brain indicates that ADAP1 is important for neuronal functions. ADAP1 has been shown to highly expressed in the neurons and plagues of Alzheimer's disease patients. In other hand, ADAP2 gene deletion has been shown to cause circulatory deficiencies and heart shape defects in zebrafish, indicating that ADAP2 has a vital role in heart development. Taken together, the hemizygous deletion of ADAP2 gene may be contributing to the cardiovascular malformation in patients with neurofibromatosis type 1 (NF1) microdeletions.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  13 QERLQGFLLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEK 92
Cdd:cd08832   1 AERNKKRLLELLKLPGNNTCADCGAPDPEWASYNLGVFICLDCSGIHRSLGTHISKVKSLRLDNWDDSQVEFMEENGNEK 80

                        90       100       110
                ....*....|....*....|....*....|...
gi 17555530  93 ARQVYEHDLPAQFRRPT-NDQQM--EQFIRSKY 122
Cdd:cd08832  81 AKAKYEAHVPAFYRRPTpTDPQVlrEQWIRAKY 113

ArfGAP domain of ACAP (ArfGAP with Coiled-coil, ANK repeat and PH domains) proteins; ArfGAP domain is an essential part of ACAP proteins that play important role in endocytosis, actin remodeling and receptor tyrosine kinase-dependent cell movement. ACAP subfamily of ArfGAPs are composed of coiled coils (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. In addition, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages. ACAP3 also positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPAQF-RR 107
Cdd:cd08835  13 NAQCCDCGSPDPRWASINLGVTLCIECSGIHRSLGVHVSKVRSLTLDSWEPELLKVMLELGNDVVNRIYEANVPDDGsVK 92

                        90       100
                ....*....|....*....|....
gi 17555530 108 PTND---QQMEQFIRSKYEQKRYI 128
Cdd:cd08835  93 PTPDssrQEREAWIRAKYVEKKFV 116

ArfGAP with GTPase domain, ANK repeat and PH domains; The AGAP subfamily of ADP-ribosylation factor GTPase-activating proteins (Arf GAPs) includes three members: AGAP1-3. In addition to the Arf GAP domain, AGAP proteins contain GTP-binding protein-like, ANK repeat and pleckstrin homology (PH) domains. AGAP1 and AGAP2 have phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2)-mediated GTPase-activating protein (GAP) activity preferentially toward Arf1, and function in the endocytic system. AGAP1 and AGAP2 independently regulate AP-3 endosomes and AP-1/Rab4 fast recycling endosomes, respectively. AGAP1, via its PH domain, directly interacts with the adapter protein 3 (AP-3), which is a coat protein involved in trafficking in the endosomal-lysosomal system, and regulates AP-3-dependent trafficking. In other hand, AGAP2 specifically binds the clathrin adaptor protein AP-1 and regulates the AP-1/Rab-4 dependent endosomal trafficking. AGAP2 is overexpressed in different human cancers including prostate carcinoma and glioblastoma, and promotes cancer cell invasion. AGAP3 exists as a component of the NMDA receptor complex that regulates Arf6 and Ras/ERK signaling pathways. Moreover, AGAP3 regulates AMPA receptor trafficking through the ArfGAP domain. Together, AGAP3 is believed to involve in linking NMDA receptor activation to AMPA receptor trafficking.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPAQfRRP 108
Cdd:cd08836  12 NDHCVDCGAPNPDWASLNLGALMCIECSGIHRNLGTHISRVRSLDLDDWPVELLKVMSAIGNDLANSVWEGNTQGR-TKP 90

                        90
                ....*....|....*...
gi 17555530 109 TND---QQMEQFIRSKYE 123
Cdd:cd08836  91 TPDssrEEKERWIRAKYE 108

Arf1 GTPase-activating protein 1; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  19 FLLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYE 98
Cdd:cd08830   4 VLRELQKLPGNNRCFDCGAPNPQWASVSYGIFICLECSGVHRGLGVHISFVRSITMDSWSEKQLKKMELGGNAKLREFFE 83

                        90
                ....*....|...
gi 17555530  99 -----HDLPAQFR 106
Cdd:cd08830  84 sygisPDLPIREK 96

ArfGAP domain of ASAP (Arf GAP, SH3, ANK repeat and PH domains) subfamily of ADP-ribosylation factor GTPase-activating proteins; The ArfGAPs are a family of multidomain proteins with a common catalytic domain that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. ASAP-subfamily GAPs include three members: ASAP1, ASAP2, ASAP3. The ASAP subfamily comprises Arf GAP, SH3, ANK repeat and PH domains. From the N-terminus, each member has a BAR, PH, Arf GAP, ANK repeat, and proline rich domains. Unlike ASAP3, ASAP1 and ASAP2 also have an SH3 domain at the C-terminus. ASAP1 and ASAP2 show strong GTPase-activating protein (GAP) activity toward Arf1 and Arf5 and weak activity toward Arf6. ASAP1 is a target of Src and FAK signaling that regulates focal adhesions, circular dorsal ruffles (CDR), invadopodia, and podosomes. ASAP1 GAP activity is synergistically stimulated by phosphatidylinositol 4,5-bisphosphate (PIP2) and phosphatidic acid. ASAP2 is believed to function as an ArfGAP that controls ARF-mediated vesicle budding when recruited to Golgi membranes. It also functions as a substrate and downstream target for protein tyrosine kinases Pyk2 and Src, a pathway that may be involved in the regulation of vesicular transport. ASAP3 is a focal adhesion-associated ArfGAP that functions in cell migration and invasion. Similar to ASAP1, the GAP activity of ASAP3 is strongly enhanced by PIP2 via PH domain. Like ASAP1, ASAP3 associates with focal adhesions and circular dorsal ruffles. However, unlike ASAP1, ASAP3 does not localize to invadopodia or podosomes. Both ASAP 1 and 3 have been implicated in oncogenesis, as ASAP1 is highly expressed in metastatic breast cancer and ASAP3 in hepatocellular carcinoma.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  28 ENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPAQfRR 107
Cdd:cd08834  14 GNDVCCDCGSPDPTWLSTNLGILTCIECSGVHRELGVHVSRIQSLTLDNLGTSELLLARNLGNEGFNEIMEANLPPG-YK 92

                        90       100
                ....*....|....*....|....
gi 17555530 108 PTNDQQMEQ---FIRSKYEQKRYI 128
Cdd:cd08834  93 PTPNSDMEErkdFIRAKYVEKKFV 116

ArfGap with Rho-Gap domain, ANK repeat and PH domain-containing proteins; The ARAP subfamily includes three members, ARAP1-3, and belongs to the ADP-ribosylation factor GTPase-activating proteins (Arf GAPs) family of proteins that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. The function of Arfs is dependent on GAPs and guanine nucleotide exchange factors (GEFs), which allow Arfs to cycle between the GDP-bound and GTP-bound forms. In addition to the Arf GAP domain, ARAPs contain the SAM (sterile-alpha motif) domain, 5 pleckstrin homology (PH) domains, the Rho-GAP domain, the Ras-association domain, and ANK repeats. ARAPs show phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3)-dependent GAP activity toward Arf6. ARAPs play important roles in endocytic trafficking, cytoskeleton reorganization in response to growth factors stimulation, and focal adhesion dynamics.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  26 EEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDS--WTPEQVQTMRVMGNEKARQVYEHDLPA 103
Cdd:cd08837  10 NPANRFCADCGAPDPDWASINLCVVICKQCAGEHRSLGSNISKVRSLKMDTkvWTEELVELFLKLGNDRANRFWAANLPP 89

                        90       100
                ....*....|....*....|....*.
gi 17555530 104 QFR-RPTND-QQMEQFIRSKYEQKRY 127
Cdd:cd08837  90 SEAlHPDADsEQRREFITAKYREGKY 115

ArfGAP domain of the AGFG subfamily (ArfGAP domain and FG repeat-containing proteins); The ArfGAP domain and FG repeat-containing proteins (AFGF) subfamily of Arf GTPase-activating proteins consists of the two structurally-related members: AGFG1 and AGFG2. AGFG1 (alias: HIV-1 Rev binding protein, HRB; Rev interacting protein, RIP; Rev/Rex activating domain-binding protein, RAB) and AGFG2 are involved in the maintenance and spread of immunodeficiency virus type 1 (HIV-1) infection. The ArfGAP domain of AGFG is related to nucleoporins, which is a class of proteins that mediate nucleocytoplasmic transport. AGFG plays a role in the Rev export pathway, which mediates the nucleocytoplasmic transfer of proteins and RNAs, possibly together by the nuclear export receptor CRM1. In humans, the presence of the FG repeat motifs (11 in AGFG1 and 7 in AGFG2) are thought to be required for these proteins to act as HIV-1 Rev cofactors. Hence, AGFG promotes movement of Rev-responsive element-containing RNAs from the nuclear periphery to the cytoplasm, which is an essential step for HIV-1 replication.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  22 DMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGvHisKVRSVNLDSWTPEQVQTMRVMGNEKARQVY--EH 99
Cdd:cd08838   6 ELLKLPENKRCFDCGQRGPTYVNLTFGTFVCTTCSGIHREFN-H--RVKSISMSTFTPEEVEFLQAGGNEVARKIWlaKW 82

                        90       100       110
                ....*....|....*....|....*....|
gi 17555530 100 DlPAQFRRP--TNDQQMEQFIRSKYEQKRY 127
Cdd:cd08838  83 D-PRTDPEPdsGDDQKIREFIRLKYVDKRW 111

ArfGAP domain of ACAP3 (ArfGAP with Coiled-coil, ANK repeat and PH domains 3); ACAP3 belongs to the ACAP subfamily of GAPs (GTPase-activating proteins) for the small GTPase Arf (ADP-ribosylation factor). ACAP subfamily of ArfGAPs are composed of Coiled coli (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. It has been shown that ACAP3 positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) also have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. Moreover, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPAQ-FRR 107
Cdd:cd08850  13 NDQCCDCGQPDPRWASINLGILLCIECSGIHRSLGVHCSKVRSLTLDSWEPELLKLMCELGNSTVNQIYEAQCEELgLKK 92

                        90       100
                ....*....|....*....|....
gi 17555530 108 PT---NDQQMEQFIRSKYEQKRYI 128
Cdd:cd08850  93 PTassSRQDKEAWIKAKYVEKKFL 116

ArfGAP domain of ACAP1 (ArfGAP with Coiled-coil, ANK repeat and PH domains 1); ACAP1 belongs to the ACAP subfamily of GAPs (GTPase-activating proteins) for the small GTPase Arf (ADP-ribosylation factor). ACAP subfamily of ArfGAPs are composed of Coiled coli (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. Moreover, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages. ACAP3 also positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPA-QFRR 107
Cdd:cd08852  13 NAQCCDCREPAPEWASINLGVTLCIQCSGIHRSLGVHFSKVRSLTLDSWEPELVKLMCELGNVIINQIYEARIEAmAIKK 92

                        90       100
                ....*....|....*....|....
gi 17555530 108 PT---NDQQMEQFIRSKYEQKRYI 128
Cdd:cd08852  93 PGpssSRQEKEAWIRAKYVEKKFI 116

ArfGAP domain of ACAP2 (ArfGAP with Coiled-coil, ANK repeat and PH domains 2); ACAP2 belongs to the ACAP subfamily of GAPs (GTPase-activating proteins) for the small GTPase Arf (ADP-ribosylation factor). ACAP subfamily of ArfGAPs are composed of Coiled coli (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. Moreover, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages. ACAP3 also positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDLPAQFRR- 107
Cdd:cd08851  13 NASCCDCGLADPRWASINLGITLCIECSGIHRSLGVHFSKVRSLTLDTWEPELLKLMCELGNDVINRIYEARVEKMGAKk 92

                        90       100
                ....*....|....*....|....
gi 17555530 108 ---PTNDQQMEQFIRSKYEQKRYI 128
Cdd:cd08851  93 pqpGGQRQEKEAYIRAKYVERKFV 116

ArfGap with Rho-Gap domain, ANK repeat and PH domain-containing protein 1; The ARAP subfamily includes three members, ARAP1-3, and belongs to the ADP-ribosylation factor GTPase-activating proteins (Arf GAPs) family of proteins that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. The function of Arfs is dependent on GAPs and guanine nucleotide exchange factors (GEFs), which allow Arfs to cycle between the GDP-bound and GTP-bound forms. In addition to the Arf GAP domain, ARAPs contain the SAM (sterile-alpha motif) domain, 5 pleckstrin homology (PH) domains, the Rho-GAP domain, the Ras-association domain, and ANK repeats. ARAPs show phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3)-dependent GAP activity toward Arf6. ARAPs play important roles in endocytic trafficking, cytoskeleton reorganization in response to growth factors stimulation, and focal adhesion dynamics. ARAP1 localizes to the plasma membrane, the Golgi complex, and endosomal compartments. It displays PI(3,4,5)P3-dependent ArfGAP activity that regulates Arf-, RhoA-, and Cdc42-dependent cellular events. For example, ARAP1 inhibits the trafficking of epidermal growth factor receptor (EGFR) to the early endosome.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  26 EEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDS--WTPEQVQTMRVMGNEKARQVYEHDL-P 102
Cdd:cd17901  10 VESNRFCADCGSPKPDWASVNLCVVICKRCAGEHRGLGPSVSKVRSLKMDRkvWTEELIELFLLLGNGKANQFWAANVpP 89

                        90       100
                ....*....|....*....|....*.
gi 17555530 103 AQFRRPTND-QQMEQFIRSKYEQKRY 127
Cdd:cd17901  90 SEALCPSSSsEERRHFITAKYKEGKY 115

ArfGap with Rho-Gap domain, ANK repeat and PH domain-containing protein 2; The ARAP subfamily includes three members, ARAP1-3, and belongs to the ADP-ribosylation factor GTPase-activating proteins (Arf GAPs) family of proteins that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. The function of Arfs is dependent on GAPs and guanine nucleotide exchange factors (GEFs), which allow Arfs to cycle between the GDP-bound and GTP-bound forms. In addition to the Arf GAP domain, ARAPs contain the SAM (sterile-alpha motif) domain, 5 pleckstrin homology (PH) domains, the Rho-GAP domain, the Ras-association domain, and ANK repeats. ARAPs show phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3)-dependent GAP activity toward Arf6. ARAPs play important roles in endocytic trafficking, cytoskeleton reorganization in response to growth factors stimulation, and focal adhesion dynamics. ARAP2 localizes to the cell periphery and on focal adhesions composed of paxillin and vinculin, and functions downstream of RhoA to regulate focal adhesion dynamics. ARAP2 is a PI(3,4,5)P3-dependent Arf6 GAP that binds RhoA-GTP, but it lacks the predicted catalytic arginine in the RhoGAP domain and does not have RhoGAP activity. ARAP2 reduces Rac1oGTP levels by reducing Arf6oGTP levels through GAP activity. AGAP2 also binds to and regulates focal adhesion kinase (FAK). Thus, ARAP2 signals through Arf6 and Rac1 to control focal adhesion morphology.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  27 EENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDS--WTPEQVQTMRVMGNEKARQVYEHDLP-- 102
Cdd:cd08856  16 ESNRSCADCKAPDPDWASINLCVVICKKCAGQHRSLGPKDSKVRSLKMDAsiWSNELIELFIVVGNKPANLFWAANLFse 95

                        90       100
                ....*....|....*....|....*
gi 17555530 103 AQFRRPTNDQQMEQFIRSKYEQKRY 127
Cdd:cd08856  96 EDLHMDSDVEQRTPFITQKYKEGKF 120

GIT2 GTPase activating protein for Arf; The GIT (G-protein coupled receptor kinase-interacting protein) subfamily includes GIT1 and GIT2, which have three ANK repeats, a Spa-homology domain (SHD), a coiled-coil domain and a C-terminal paxillin-binding site (PBS). The GIT1/2 proteins are GTPase-activating proteins that function as an inactivator of Arf signaling, and interact with the PIX/Cool family of Rac/Cdc42 guanine nucleotide exchange factors (GEFs). Unlike other ArfGAPs, GIT and PIX (Pak-interacting exchange factor) proteins are tightly associated to form an oligomeric complex that acts as a scaffold and signal integrator that can be recruited for multiple signaling pathways. The GIT/PIX complex functions as a signaling scaffold by binding to specific protein partners. As a result, the complex is transported to specific cellular locations. For instance, the GIT partners paxillin or integrin-alpha4 (to focal adhesions), piccolo and liprin-alpha (to synapses), and the beta-PIX partner Scribble (to epithelial cell-cell contacts and synapses). Moreover, the GIT/PIT complex functions to integrate signals from multiple GTP-binding protein and protein kinase pathways to regulate the actin cytoskeleton and thus cell polarity, adhesion and migration.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  32 CADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDL--PAQF---R 106
Cdd:cd08847  11 CADCSTSDPRWASVNRGVLICDECCSVHRSLGRHISQVRHLKHTSWPPTLLQMVQTLYNNGANSIWEHSLldPASImsgK 90

                        90       100
                ....*....|....*....|.
gi 17555530 107 RPTNDQ-----QMEQFIRSKY 122
Cdd:cd08847  91 RKANPQdkvhpNKAEFIRAKY 111

Arf1 GTPase-activating protein 2; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDS-WTPEQVQTMRVMGNEKARQVY-EHDLPAQFR 106
Cdd:cd09029  19 NKACFDCGAKNPSWASITYGVFLCIDCSGVHRSLGVHLSFIRSTELDSnWNWFQLRCMQVGGNANATAFFrQHGCTTNDA 98

                        90
                ....*....|....*...
gi 17555530 107 RPTNDQQMEQFIRSKYEQ 124
Cdd:cd09029  99 NAKYNSRAAQMYREKIRQ 116

Arf1 GTPase-activating protein 3; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60
                ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDS-WTPEQVQTMRVMGNEKA 93
Cdd:cd09028  19 NKVCFDCGAKNPSWASITYGVFLCIDCSGIHRSLGVHLSFIRSTELDSnWSWFQLRCMQVGGNANA 84

GIT1 GTPase activating protein for Arf; The GIT (G-protein coupled receptor kinase-interacting protein) subfamily includes GIT1 and GIT2, which have three ANK repeats, a Spa-homology domain (SHD), a coiled-coil domain and a C-terminal paxillin-binding site (PBS). The GIT1/2 proteins are GTPase-activating proteins that function as an inactivator of Arf signaling, and interact with the PIX/Cool family of Rac/Cdc42 guanine nucleotide exchange factors (GEFs). Unlike other ArfGAPs, GIT and PIX (Pak-interacting exchange factor) proteins are tightly associated to form an oligomeric complex that acts as a scaffold and signal integrator that can be recruited for multiple signaling pathways. The GIT/PIX complex functions as a signaling scaffold by binding to specific protein partners. As a result, the complex is transported to specific cellular locations. For instance, the GIT partners paxillin or integrin-alpha4 (to focal adhesions), piccolo and liprin-alpha (to synapses), and the beta-PIX partner Scribble (to epithelial cell-cell contacts and synapses). Moreover, the GIT/PIT complex functions to integrate signals from multiple GTP-binding protein and protein kinase pathways to regulate the actin cytoskeleton and thus cell polarity, adhesion and migration.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  25 KEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHISKVRSVNLDSWTPEQVQTMRVMGNEKARQVYEHDL--P 102
Cdd:cd08846   4 KGPRAEVCADCSAPDPGWASINRGVLICDECCSVHRSLGRHISIVKHLRHSAWPPTLLQMVHTLASNGANSIWEHSLldP 83

                        90       100
                ....*....|....*....|....*...
gi 17555530 103 AQF---RRPTNDQQ-----MEQFIRSKY 122
Cdd:cd08846  84 AQVqsgRRKANPQDkvhptKSEFIRAKY 111

ArfGAP domain of AGFG1 (ArfGAP domain and FG repeat-containing protein 1); The ArfGAP domain and FG repeat-containing proteins (AFGF) subfamily of Arf GTPase-activating proteins consists of the two structurally-related members: AGFG1 and AGFG2. AGFG1 (alias: HIV-1 Rev binding protein, HRB; Rev interacting protein, RIP; Rev/Rex activating domain-binding protein, RAB) and AGFG2 are involved in the maintenance and spread of immunodeficiency virus type 1 (HIV-1) infection. The ArfGAP domain of AGFG1 is related to nucleoporins, which is a class of proteins that mediate nucleocytoplasmic transport. AGFG1 plays a role in the Rev export pathway, which mediates the nucleocytoplasmic transfer of proteins and RNAs, possibly together by the nuclear export receptor CRM1. In humans, the presence of the FG repeat motifs (11 in AGFG1 and 7 in AGFG2) are thought to be required for these proteins to act as HIV-1 Rev cofactors. Hence, AGFG1 promotes movement of Rev-responsive element-containing RNAs from the nuclear periphery to the cytoplasm, which is an essential step for HIV-1 replication.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  19 FLLDMLKEEENKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHiSKVRSVNLDSWTPEQVQTMRVMGNEKARQVY- 97
Cdd:cd08857   4 MLREMTSLPHNRKCFDCDQRGPTYANMTVGSFVCTSCSGILRGLNPP-HRVKSISMTTFTQQEIEFLQKHGNEVCKQIWl 82

                        90       100       110
                ....*....|....*....|....*....|....*.
gi 17555530  98 ------EHDLPaQFRRPtndQQMEQFIRSKYEQKRY 127
Cdd:cd08857  83 glfddrSSAIP-DFRDP---QKVKEFLQEKYEKKRW 114

ArfGAP domain of AGFG2 (ArfGAP domain and FG repeat-containing protein 2); The ArfGAP domain and FG repeat-containing proteins (AFGF) subfamily of Arf GTPase-activating proteins consists of the two structurally-related members: AGFG1 and AGFG2. AGFG2 is a member of the HIV-1 Rev binding protein (HRB) family and contains one Arf-GAP zinc finger domain, several Phe-Gly (FG) motifs, and four Asn-Pro-Phe (NPF) motifs. AGFG2 interacts with Eps15 homology (EH) domains and plays a role in the Rev export pathway, which mediates the nucleocytoplasmic transfer of proteins and RNAs. In humans, the presence of the FG repeat motifs (11 in AGFG1 and 7 in AGFG2) are thought to be required for these proteins to act as HIV-1 Rev cofactors. Hence, AGFG promotes movement of Rev-responsive element-containing RNAs from the nuclear periphery to the cytoplasm, which is an essential step for HIV-1 replication.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 17555530  29 NKYCADCQAKTPRWAAWNLGVFICIRCAGIHRNLGVHiSKVRSVNLDSWTPEQVQTMRVMGNEKARQVY------EHDLP 102
Cdd:cd17903  14 NRHCFECAQRGVTYVDITVGSFVCTTCSGLLRGLNPP-HRVKSISMTTFTEPEVLFLQARGNEVCRKIWlglfdaRTSLI 92

                        90       100
                ....*....|....*....|....*
gi 17555530 103 AQFRRPtndQQMEQFIRSKYEQKRY 127
Cdd:cd17903  93 PDSRDP---QKVKEFLQEKYEKKRW 114