PHR domain; This domain is called PHR as it was original found in the proteins PAM, highwire and RPM. This domain can be duplicated in the highwire, PFAM and PRM sequence. The C-terminal region of the protein BTBD1 includes the PHR domain and is known to interact with Topoisomerase I, an enzyme which relaxes DNA supercoils.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460 225 HRFQSCAYRsnqWRYRGRC-DSIQFAVDKRVFIAGFGLYGSSCGSAEYSAKIELK------RQGVVLGQNLSKYFSDGSS 297
Cdd:pfam08005   1 NRFQSTGGG---WGYSGGSpDAIRFSVDRDIFLVGFGLYGSIGGPADYSVKIELIdgerweSLGEVLGENDTTFSSDGSN 77

                          90       100       110       120       130       140       150
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460 298 NTFPVWFEYPVQIEPDTFYTASVILDGNElSYFGQEGMTEVQC-GKVTVQFQCSSDSTNGTGVQGGQIPELIFY 370
Cdd:pfam08005  78 DIFRVLFDEPVEIEPNVKYTASAKIKGPS-SYYGTNGLREVTCdGGVTFQFSSSSLSNNGTSVNRGQIPELLYY 150

PHR domain; This domain is called PHR as it was original found in the proteins PAM, highwire and RPM. This domain can be duplicated in the highwire, PFAM and PRM sequence. The C-terminal region of the protein BTBD1 includes the PHR domain and is known to interact with Topoisomerase I, an enzyme which relaxes DNA supercoils.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460 225 HRFQSCAYRsnqWRYRGRC-DSIQFAVDKRVFIAGFGLYGSSCGSAEYSAKIELK------RQGVVLGQNLSKYFSDGSS 297
Cdd:pfam08005   1 NRFQSTGGG---WGYSGGSpDAIRFSVDRDIFLVGFGLYGSIGGPADYSVKIELIdgerweSLGEVLGENDTTFSSDGSN 77

                          90       100       110       120       130       140       150
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460 298 NTFPVWFEYPVQIEPDTFYTASVILDGNElSYFGQEGMTEVQC-GKVTVQFQCSSDSTNGTGVQGGQIPELIFY 370
Cdd:pfam08005  78 DIFRVLFDEPVEIEPNVKYTASAKIKGPS-SYYGTNGLREVTCdGGVTFQFSSSSLSNNGTSVNRGQIPELLYY 150

BTB And C-terminal Kelch; The BACK domain is found juxtaposed to the BTB domain; they are separated by as little as two residues.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   75 CV-LLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLN-AKEIVVFEAALNWAEVECqrqdla 152
Cdd:smart00875   1 CLgIRRFADAHGLEELAEKALRFILQNFSEVSSSEEFLELPLEQLLELLSSDDLNvSSEEEVFEAVLRWVKHDP------ 74

                           90       100
                   ....*....|....*....|....*....
gi 2045150460  153 lsiENKRKVLGKALYLIRIPTMALDDFAN 181
Cdd:smart00875  75 ---EKRREHLPELLEHVRLPLLSPDYLLE 100

BTB/POZ domain; The BTB (for BR-C, ttk and bab) or POZ (for Pox virus and Zinc finger) domain is present near the N-terminus of a fraction of zinc finger (pfam00096) proteins and in proteins that contain the pfam01344 motif such as Kelch and a family of pox virus proteins. The BTB/POZ domain mediates homomeric dimerization and in some instances heteromeric dimerization. The structure of the dimerized PLZF BTB/POZ domain has been solved and consists of a tightly intertwined homodimer. The central scaffolding of the protein is made up of a cluster of alpha-helices flanked by short beta-sheets at both the top and bottom of the molecule. POZ domains from several zinc finger proteins have been shown to mediate transcriptional repression and to interact with components of histone deacetylase co-repressor complexes including N-CoR and SMRT. The POZ or BTB domain is also known as BR-C/Ttk or ZiN.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   1 MFYGELAE-DKDEIRIPDVEPAAFLAMLKYIYCDEIdLAADTVLATLYAAKKYIVPHLARACVNFLETSL 69
Cdd:pfam00651  39 LFSGQESEsSVSEITLDDVSPEDFEALLEFMYTGKL-ISEENVDDLLAAADKLQIPSLVDKCEEFLIKSL 107

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing proteins, BTBD3 and BTBD6; This subfamily includes BTB/POZ domain-containing proteins BTBD3 and BTBD6, both of which are BTB-domain-containing Kelch-like proteins. BTBD3 controls dendrite orientation toward active axons in mammalian neocortex. BTBD6 is required for proper embryogenesis and plays an essential evolutionarily-conserved role during neuronal development.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWAEVECQR 148
Cdd:cd18488     1 LSARNACVLLSQSRLFEEPELMQRCWEVIDAQAELALKSEGFTEIDYKTLESILRRETLNAKESVVFEAALRWAEAECQR 80

                          90
                  ....*....|....*
gi 2045150460 149 QDLALSIENKRKVLG 163
Cdd:cd18488    81 RGLEPTPENKRKVLG 95

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing protein 6 (BTBD6); BTBD6, also called lens BTB domain protein, is a BTB-domain-containing Kelch-like protein that is required for proper embryogenesis and plays an essential evolutionarily-conserved role during neuronal development.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWAEVECQR 148
Cdd:cd18525     1 LEAKNACVLLSQSRLFEEPELTQRCWEVIDAQAELALKSEGFCEIDQQTLEIILTRETLNTKEVVVFEAVLNWAEAECKR 80

                          90
                  ....*....|....*
gi 2045150460 149 QDLALSIENKRKVLG 163
Cdd:cd18525    81 QGLPPTARNKRNVLG 95

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in BTB/POZ domain-containing proteins, BTBD3 and BTBD6; This family includes BTB/POZ domain-containing proteins BTBD3 and BTBD6, both of which are BTB-domain-containing Kelch-like proteins. BTBD3 controls dendrite orientation toward active axons in mammalian neocortex. BTBD6 is required for proper embryogenesis and plays an essential evolutionary conserved role during neuronal development. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 2045150460   1 MFYGELAEDKDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSL 69
Cdd:cd18282    40 MFYGGLAENKNEIEIPDVEPAAFLNLLRYLYCDEIDLEPDTVLATLYAAKKYLVPHLARACVQFLETSL 108

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing proteins, BTBD1 and BTBD2; This subfamily includes BTB/POZ domain-containing proteins BTBD1 and BTBD2, both of which are BTB-domain-containing Kelch-like proteins that interact with DNA topoisomerase 1 (Topo1), a key enzyme in cell survival. BTBD1 and BTBD2 colocalize to cytoplasmic bodies with the RBCC/tripartite motif protein, TRIM5delta.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWAEVECQR 148
Cdd:cd18487     1 LSSDNAFMLLTQARLFDEPQLASLCLETIDKNTAEALAAEGFTDIDLDTLCVVLERDTLGIRECKLFQAVLRWAEAECQR 80

                          90
                  ....*....|....*
gi 2045150460 149 QDLALSIENKRKVLG 163
Cdd:cd18487    81 QGLSVTPENQRKVLG 95

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing protein 1 (BTBD1); BTBD1, also called Hepatitis C virus NS5A-transactivated protein 8 or HCV NS5A-transactivated protein 8, is a BTB-domain-containing Kelch-like protein specifically expressed in skeletal muscle. It interacts with DNA topoisomerase 1 (Topo1), a key enzyme in cell survival. BTBD1 and BTBD2 colocalize to cytoplasmic bodies with the RBCC/tripartite motif protein, TRIM5delta. It may serve as a substrate-specific adaptor of an E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWAEVECQR 148
Cdd:cd18522     1 LRADNAFMLLTQARLFDEPQLASLCLDTIDKSTMDAISAEGFTDIDLDTLCAVLERDTLSIRESRLFGAVVRWAEAECQR 80

                          90       100
                  ....*....|....*....|....*.
gi 2045150460 149 QDLALSIENKRKVLGKALYLIRIPTM 174
Cdd:cd18522    81 QQLPVTSENKQKVLGKALSLIRFPLM 106

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in BTB/POZ domain-containing protein 1 (BTBD1); BTBD1, also called Hepatitis C virus NS5A-transactivated protein 8 or HCV NS5A-transactivated protein 8, is a BTB-domain-containing Kelch-like protein that is expressed in skeletal muscle and interacts with DNA topoisomerase 1 (Topo1), a key enzyme of cell survival. BTBD1 and BTBD2 colocalize to cytoplasmic bodies with the RBCC/tripartite motif protein, TRIM5delta. BTBD1 may serve as substrate-specific adaptor of an E3 ubiquitin-protein ligase complex that mediates the ubiquitination and subsequent proteasomal degradation of target proteins. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 2045150460   1 MFYGELAEDKDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18346    61 MFNGGMATTSAEIELPDVEPAAFLALLRFLYSDEVQIGPETVMTTLYTAKKYAVPALEAHCVEFLTKHLRADN 133

BTB And C-terminal Kelch; The BACK domain is found juxtaposed to the BTB domain; they are separated by as little as two residues.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   75 CV-LLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLN-AKEIVVFEAALNWAEVECqrqdla 152
Cdd:smart00875   1 CLgIRRFADAHGLEELAEKALRFILQNFSEVSSSEEFLELPLEQLLELLSSDDLNvSSEEEVFEAVLRWVKHDP------ 74

                           90       100
                   ....*....|....*....|....*....
gi 2045150460  153 lsiENKRKVLGKALYLIRIPTMALDDFAN 181
Cdd:smart00875  75 ---EKRREHLPELLEHVRLPLLSPDYLLE 100

BTB/POZ domain; The BTB (for BR-C, ttk and bab) or POZ (for Pox virus and Zinc finger) domain is present near the N-terminus of a fraction of zinc finger (pfam00096) proteins and in proteins that contain the pfam01344 motif such as Kelch and a family of pox virus proteins. The BTB/POZ domain mediates homomeric dimerization and in some instances heteromeric dimerization. The structure of the dimerized PLZF BTB/POZ domain has been solved and consists of a tightly intertwined homodimer. The central scaffolding of the protein is made up of a cluster of alpha-helices flanked by short beta-sheets at both the top and bottom of the molecule. POZ domains from several zinc finger proteins have been shown to mediate transcriptional repression and to interact with components of histone deacetylase co-repressor complexes including N-CoR and SMRT. The POZ or BTB domain is also known as BR-C/Ttk or ZiN.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   1 MFYGELAE-DKDEIRIPDVEPAAFLAMLKYIYCDEIdLAADTVLATLYAAKKYIVPHLARACVNFLETSL 69
Cdd:pfam00651  39 LFSGQESEsSVSEITLDDVSPEDFEALLEFMYTGKL-ISEENVDDLLAAADKLQIPSLVDKCEEFLIKSL 107

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing protein 9 (BTBD9); BTBD9 is a risk factor for Restless Legs Syndrome (RLS) encoding a Cullin-3 substrate adaptor. The BTBD9 gene may be associated with antipsychotic-induced RLS in schizophrenia. Mutations in BTBD9 lead to reduced dopamine, increased locomotion and sleep fragmentation.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWAEVECQR 148
Cdd:cd14822     1 LNIRNVCLIYDVASLYSLDDLCQTCCQFMDRNAQEVLSSEGFLTLSKSALKELLSRDSFCAPEVDIFNAVRRWCEHNPDS 80

                          90       100       110
                  ....*....|....*....|....*....|
gi 2045150460 149 QDLALSIenkrkvlgkaLYLIRIPTMALDD 178
Cdd:cd14822    81 KEDAKEI----------LEAVRLPLMSLTE 100

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in BTB/POZ domain-containing protein 19 (BTBD19); BTBD19 is a BTB domain-containing protein. Its function remains unclear. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 2045150460   1 MFYGELAEDKDEIRIP--DVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFL 65
Cdd:cd18294    45 MFLTGPQKESTQSPLVlsDIEPEVFRAVLEFIYTNCVTLSNHTVIEVLAAAVEYGLDELRKLCERFI 111

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 7 (KLHL7); KLHL7 is a component of a Cul3-based E3 ubiquitin ligase complex and is involved in the ubiquitination of target proteins for proteasome-mediated degradation. Mutations in KLHL7 causes autosomal-dominant retinitis pigmentosa. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAEDKD-EIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18237    50 MFTSNMTESKSsEVELKDAEPDIIELLVEFAYTARISVNSNNVQSLLDAANQYQIEPVKKMCVDFLKEQLDASN 123

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like proteins, KLHL40 and KLHL41; This family includes Kelch-like proteins, KLHL40 and KLHL41. KLHL40 is a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin ligase complex that acts as a key regulator of skeletal muscle development. KLHL41 is a novel kelch related protein that is involved in pseudopod elongation in transformed cells. They both contain a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAEDKD-EIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18269    56 MFLSDLEESKKkEVVLEDVDPDVMGMILKYLYTSEIDLNDQNVQDIFALASRFQIPSIFTVCVSYLQKRLSLSN 129

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 8 (KLHL8); KLHL8 is a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin ligase complex required for the ubiquitination and degradation of rapsyn, a postsynaptic protein required for clustering of nicotinic acetylcholine receptors (nAChRs) at the neuromuscular junction. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460   1 MFYGELAEDK-DEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKNA 74
Cdd:cd18238    44 MFTSEMAESKqDSITIKDIDEEAVELLVDFAYTGKLTLTVDNVQSLLYAASLLQVEEVAKACCEFMKDHLHPSNC 118

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 10 (KLHL10); KLHL10 is a substrate-specific adaptor of a CUL3-based E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins specifically in the testis during spermatogenesis. Haploinsufficiency of Klhl10 causes infertility in male mice. KLHL10 contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460   9 DKDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18240    55 EKKVYKIPGVSPEMMELIIEYAYTRTVPITAENVEELLPAADQFNIMGIVKACCDFLEDQLCPEN 119

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in intracisternal A particle-promoted polypeptide (IPP); IPP, also called Kelch-like protein 27 (KLHL27) or actin-binding protein IPP, is an actin-binding protein that may play a role in organizing the actin cytoskeleton. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460   1 MFYGELAED-KDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKNA 74
Cdd:cd18256    49 LFAGGMSESsKDVVQIHGVEPDIFHILLDFIYTGVVEVTVSNVQELLVAADMLQLTEVVEICCEFLKGQLHPSNC 123

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like ECH-associated protein 1 (KEAP1); KEAP1, also called cytosolic inhibitor of Nrf2 (INrf2) or Kelch-like protein 19 (KLHL19), is a redox-regulated substrate adaptor protein for a Cullin3-dependent ubiquitin ligase complex that targets NFE2L2/NRF2 for ubiquitination and degradation by the proteasome, thus resulting in the suppression of its transcriptional activity and the repression of antioxidant response element-mediated detoxifying enzyme gene expression. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   1 MFYGELAE-DKDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSL 69
Cdd:cd18248    54 MFTSGLREcGMEVVPIEGVHPCVMSRLIEFAYTASISVGEKCVLHVLPGAVMYQMDSVVKACCDFLEQQL 123

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Ankyrin repeat and BTB/POZ domain-containing protein 2 (ABTB2) and similar proteins; This family includes ABTB2, BTBD11, plant ARM repeat protein interacting with ABF2 (ARIA), and similar proteins. ABTB2, also called bood POZ containing gene type 2 (BPOZ-2), is a scaffold protein that controls the degradation of many biological proteins ranging from embryonic development to tumor progression. It may be involved in the initiation of hepatocyte growth. ABTB2 functions as an adaptor protein for the E3 ubiquitin ligase scaffold protein Cullin-3. It directly binds to eukaryotic elongation factor 1A1 (eEF1A1) to promote eEF1A1 ubiquitylation and degradation, and prevent translation. The BTBD11 gene has been recently identified as an all-trans retinoic acid (atRA)-responsive gene that lies downstream of atRA and its receptors in the regulation of neurite outgrowth and cell adhesion in neural as well as non-neural tissues. ARIA is an armadillo (ARM) repeat and BTB domain-containing protein that acts as a positive regulator of ABA response via the modulation of the transcriptional activity of ABF2. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 2045150460   1 MFYGELAE-DKDEIRIPDVEPAAFLAMLKYIYC---DEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18297    41 MLSSGSTEaQTPVIEIPDIRYDIFQLMMQYLYTggvESLDVAQDDALELLRAASFFQLDGLKRHCEILLSQQIDLDN 117

BACK (BTB and C-terminal Kelch) domain; The BACK domain is found in architectures C-terminal to a BTB domain, in a diverse set of architectures together with Kelch, MATH, and/or TAZ domains. It is involved in interactions with the Cullin3 (Cul3) ubiquitin ligase complex, as well as in homo-oligomerization. Most proteins containing the BACK domain are understood to function as adaptor proteins that play a role in ubiquitination of various substrates.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460  70 SAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRR 124
Cdd:cd14733     1 DPENCLGILELADLYNLEELKEKALKFILENFEEVSKSEEFLELSVELLLELLSS 55

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in plant BTB/POZ-MATH (BPM) protein family; The BPM protein family includes Arabidopsis thaliana BTB/POZ and MATH domain-containing proteins, AtBPM1-6, and similar proteins from other plants. BPM protein, also called protein BTB-POZ and MATH domain, may act as a substrate-specific adaptor of an E3 ubiquitin-protein ligase complex (CUL3-RBX1-BTB) which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAEDKD-EIRIPDVEPAAFLAMLKYIYCDEI----------DLAADTVLAT--LYAAKKYIVPHLARAC 61
Cdd:cd18280    43 MLFGPMREENEgEIVIEDVEPPVFKALLHFIYKDELpddvepagsdSSSLDTTMAQhlLAAADRYALERLRLLC 116

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 35 (KLHL35); KLHL35 contains a BTB domain and kelch repeats, characteristics of a kelch family protein. Its function remains unclear. Significant differences in DNA methylation of the KLHL35 gene in abdominal aortic aneurysm (AAA) patients compared to non-AAA controls suggest a potential role in AAA pathology. Hypermethylation of the KLHL35 gene has also been associated with the development of hepatocellular carcinoma. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAEDK-DEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18265    52 MFGGHLKESRqAVVEIQKVSAAAMEVLLDYMYGGGLRIQEDNVESVLEASDLLQVSKLREACVRFLEGQLHPCN 125

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in speckle-type POZ protein (SPOP) and similar proteins; This family includes speckle-type POZ protein (SPOP), speckle-type POZ protein-like (SPOPL), TD and POZ domain-containing proteins (TDPOZ), Drosophila melanogaster protein roadkill and similar proteins. Both, SPOP and SPOPL, serve as adaptors of cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complexes that mediate the ubiquitination and proteasomal degradation of target proteins. TDPOZ is a family of bipartite animal and plant proteins that contain a tumor necrosis factor receptor-associated factor (TRAF) domain (TD) and a POZ/BTB domains. TDPOZ proteins may be nuclear scaffold proteins probably involved in transcription regulation in early development and other cellular processes. Drosophila melanogaster protein roadkill, also called Hh-induced MATH and BTB domain-containing protein (HIB), is a hedgehog-induced BTB protein that modulates hedgehog signaling by degrading Ci/Gli transcription factor. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 2045150460   1 MFYGELAED-KDEIRIPDVEPAAFLAMLKYIY---CDEIDLAADTVLAtlyAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18279    47 MFEHEMEESkKNRVEINDVDPEVFKEMMRFIYtgkAPNLDKMADDLLA---AADKYALERLKVMCEDALCSNLSVEN 120

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Influenza virus NS1A-binding protein (NS1-BP); NS1-BP is also called NS1-binding protein, aryl hydrocarbon receptor-associated protein 3 (ARA3), or IVNS1ABP. It is a novel protein that interacts with the influenza A virus nonstructural NS1 protein, which is relocalized in the nuclei of infected cells. It plays a role in cell division and in the dynamic organization of the actin skeleton as a stabilizer of actin filaments by association with F-actin through its kelch repeats. It also interacts with alpha-enolase/MBP-1 and is involved in c-Myc gene transcriptional control. NS1-BP contains BTB and BACK domains at the N-terminal region and kelch repeats at the C-terminal region. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 2045150460  14 RIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKNA 74
Cdd:cd18306    61 KLDGLDPDAVEVLVNYAYTSRLEVPADLVKSVYSAAKKLKMDRVKKACGDFLLEKLTPQNC 121

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 3 (KLHL3); KLHL3 is a component of an E3 ubiquitin ligase complex that regulates blood pressure by targeting With-No-Lysine (WNK) kinases for degradation. It contains a BTB domain and kelch repeat domains, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460   1 MFYGELAEDK-DEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSL 69
Cdd:cd18339    50 MFTGDMSESKaKKIEIKDVDGQTLSKLIDYIYTAEIEVTEENVQVLLPAASLLQLMDVRQNCCDFLQSQL 119

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 4 (KLHL4); KLHL4 shares high identity and similarity with the Drosophila kelch protein, a component of ring canals. It may be associated with X-linked cleft palate (CPX) and is also a candidate gene in the impairment of mullerian duct development. In addition, it has been identified as a target of insulin-like growth factor binding protein 5 (IGFBP5). KLHL4 contains a BTB domain and kelch repeat domains, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAEDK-DEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18336    48 MFTNDVREAKqEEIKMEGVDPDALKALVHYAYTGVLELKEDTIESLLAAACLLQLSQVIDVCCNFLMKQLHPSN 121

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 12 (KLHL12); KLHL12, also called CUL3-interacting protein 1 (C3IP1) or DKIR homolog, is a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin ligase complex that acts as a negative regulator of the Wnt signaling pathway and ER-Golgi transport. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....
gi 2045150460   1 MFYGELAE-DKDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKN 73
Cdd:cd18242    50 MFTSEMSEkGKSEVELQGLTASTMEILLDFVYTETVHVTVENVQELLPAACLLQLKGVKQACCEFLESQLDPSN 123

BACK (BTB and C-terminal Kelch) domain found in Kelch-like protein 18 (KLHL18); KLHL18 acts as a substrate-specific adaptor for the Cullin3 E3 ubiquitin-protein ligase complex that regulates mitotic entry and ubiquitylates Aurora-A.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460 106 KSEGFCDIDFQTLESILRRETLNAK-EIVVFEAALNWAevecqRQDlalsIENKRKVLGKALYLIRIPTM 174
Cdd:cd18457    38 KSEEFLALSKEEVLEILSRDELNVKsEEQVFEAALAWV-----KYD----RENREEYLPELLSKVRLPLL 98

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 21 (KLHL21); KLHL21 is a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex required for efficient chromosome alignment and cytokinesis. The BCR(KLHL21) E3 ubiquitin ligase complex regulates localization of the chromosomal passenger complex (CPC) from chromosomes to the spindle midzone in anaphase and mediates the ubiquitination of aurora B. KLHL21 also targets IkappaB kinase-beta to regulate nuclear factor kappa-light chain enhancer of activated B cells (NF-kappaB) signaling negatively. It contains a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460   1 MFYGELAEDK-DEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKNA 74
Cdd:cd18250    50 MFAGELRESRaDRVVLHGVSAEILGLLLDFSYTGRVTVTQDNVEALLRAADLFQFPSVKEACCAYLQQRLDVSNC 124

BACK (BTB and C-terminal Kelch) domain found in BTB/POZ domain-containing protein 19 (BTBD19); BTBD19 is a BTB-domain-containing Kelch-like protein. Its function remains unclear.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 2045150460  70 SAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNAKEIVVFEAALNWA 142
Cdd:cd18494     1 SVETACEALQAAVTYGQDELKERCLAFIEEHTEEVFKTKGFHELSDEALSVILRSDKLRIDELDILKAVREWA 73

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch repeat and BTB domain-containing protein 8 (KBTBD8); KBTBD8, also called T-cell activation kelch repeat protein (TA-KRP), is a BTB-kelch family protein that is located in the Golgi apparatus and translocates to the spindle apparatus during mitosis. It acts as a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin ligase complex that acts as a regulator of neural crest specification. The BCR(KBTBD8) complex monoubiquitylates NOLC1 and its paralog TCOF1, the mutation of which underlies the neurocristopathy Treacher Collins syndrome. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2045150460   1 MFYGELAED-KDEIRIPDVEPAAFLAMLKYIYCDEIDLAADTVLATLYAAKKYIVPHLARACVNFLETSLSAKNA 74
Cdd:cd18274    52 MFTSGLTEStQKEVRIVGVEAESMHLVLDYAYTSRVTLTEANVQALFTAASIFQIPSLQDQCAQFMISRLDPQNS 126

BACK (BTB and C-terminal Kelch) domain found in Kelch repeat and BTB domain-containing protein 2 (KBTBD2); KBTBD2, also called BTB and kelch domain-containing protein 1 (BKLHD1), plays an essential role in the regulating the insulin-signaling pathway. It is a BTB-Kelch family substrate recognition subunit of the Cullin-3-based E3 ubiquitin ligase, which targets p85alpha, the regulatory subunit of the phosphoinositol-3-kinase (PI3K) heterodimer, causing p85alpha ubiquitination and proteasome-mediated degradation.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2045150460  69 LSAKNACVLLSQSCLFEEPDLTQRCWEVIDAQAELALKSEGFCDIDFQTLESILRRETLNA-KEIVVFEAALNWAEvecq 147
Cdd:cd18479     1 INAENCVRLLSFADLFSCEELKQSAKRMVEHKFTAVYHQEAFMQLSHDLLIDILSSDNLNVeKEETVREAAMLWLE---- 76

                          90       100
                  ....*....|....*....|....
gi 2045150460 148 rqdlaLSIENKRKVLGKALYLIRI 171
Cdd:cd18479    77 -----YNTESRSQYLSSVLSQIRI 95

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch repeat and BTB domain-containing proteins KBTBD6 and KBTBD7; KBTBD6 and KBTBD7 are substrate adaptors of a cullin-3 RING ubiquitin ligase complex that mediates ubiquitylation and proteasomal degradation of T-lymphoma and metastasis gene 1 (TIAM1), a RAC1-specific guanine exchange factor (GEF), by cooperating with gamma-aminobutyric acid receptor-associated proteins (GABARAP). KBTBD7 may also act as a new transcriptional activator in mitogen-activated protein kinase (MAPK) signaling. They both contain a BTB domain and kelch repeats, characteristics of a kelch family protein. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 2045150460   1 MFYGELAEDKDE-IRIPDVEPAAFLAMLKYIYCDEIDLAADTVlATLYAAKKYI-VPHLARACVNFLETSLSAKNaCV 76
Cdd:cd18273    63 MFTGGLYESKQEtVTIHDVDSESMALIIDYCYTGRVTLSEANV-QRLYAAANMLqLEYVREACASFLARRLDLSN-CV 138

first BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in leucine-zipper-like transcriptional regulator 1 (LZTR-1); LZTR-1 is a golgi BTB-kelch protein that is degraded upon induction of apoptosis. It may also function as a transcriptional regulator that plays a crucial role in embryogenesis. Germline loss-of-function mutations in LZTR-1 predispose to an inherited disorder of multiple schwannomas. LZTR-1 contains two BTB domains. This model corresponds to the first domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 2045150460  12 EIRIPDVEPAAFLAMLKYIYCDEIDL--------AADTVLAT--LYA-AKKYIVPHLARACVNFLE 66
Cdd:cd18308    91 EVRLPEADPEAFELILSFIYTDKIDPtrkgqdpgSNEVVLLMmdVYRlALQFQMSRLEQLCVQYLE 156