BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 10 (KCTD10); KCTD10, also called BTB/POZ domain-containing adapter for CUL3-mediated RhoA degradation protein 3 (BACURD3), is a BTB/POZ domain-containing protein that interacts with proliferating cell nuclear antigen (PCNA) and polymerase delta, and participates in DNA repair, DNA replication, and cell-cycle control. Its down-regulation could inhibit cell proliferation. KCTD10 also plays crucial roles in embryonic angiogenesis and heart development in mammals by negatively regulating the Notch signaling pathway. Furthermore, KCTD10 may function as a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex, which mediates the ubiquitination of target proteins, leading to their degradation by the proteasome. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD10 BTB domain forms a novel two-fold symmetric tetramer that is distinct from the tetramer formed by voltage-gated potassium (Kv) channels.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  26 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 105
Cdd:cd18399    1 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 80

                         90       100       110
                 ....*....|....*....|....*....|.
gi 959092930 106 EELLAEAKYYLVQGLVEECQAALqQNKDTYE 136
Cdd:cd18399   81 EELLAEAKYYLVQGLVEECQAAL-QNKDTYE 110

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 10 (KCTD10); KCTD10, also called BTB/POZ domain-containing adapter for CUL3-mediated RhoA degradation protein 3 (BACURD3), is a BTB/POZ domain-containing protein that interacts with proliferating cell nuclear antigen (PCNA) and polymerase delta, and participates in DNA repair, DNA replication, and cell-cycle control. Its down-regulation could inhibit cell proliferation. KCTD10 also plays crucial roles in embryonic angiogenesis and heart development in mammals by negatively regulating the Notch signaling pathway. Furthermore, KCTD10 may function as a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex, which mediates the ubiquitination of target proteins, leading to their degradation by the proteasome. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD10 BTB domain forms a novel two-fold symmetric tetramer that is distinct from the tetramer formed by voltage-gated potassium (Kv) channels.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  26 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 105
Cdd:cd18399    1 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 80

                         90       100       110
                 ....*....|....*....|....*....|.
gi 959092930 106 EELLAEAKYYLVQGLVEECQAALqQNKDTYE 136
Cdd:cd18399   81 EELLAEAKYYLVQGLVEECQAAL-QNKDTYE 110

Broad-Complex, Tramtrack and Bric a brac; Domain in Broad-Complex, Tramtrack and Bric a brac. Also known as POZ (poxvirus and zinc finger) domain. Known to be a protein-protein interaction motif found at the N-termini of several C2H2-type transcription factors as well as Shaw-type potassium channels. Known structure reveals a tightly intertwined dimer formed via interactions between N-terminal strand and helix structures. However in a subset of BTB/POZ domains, these two secondary structures appear to be missing. Be aware SMART predicts BTB/POZ domains without the beta1- and alpha1-secondary structures.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930    33 YVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEgWILIDRCGKHFGTILNYLRDGAVPLPESrrEIEELLAEA 112
Cdd:smart00225   1 DVTLVVGGKKFHAHKAVLAAHSPYFKALFSSDFKESDKSE-IYLDDVSPEDFRALLNFLYTGKLDLPEE--NVEELLELA 77

                           90
                   ....*....|....*....
gi 959092930   113 KYYLVQGLVEECQAALQQN 131
Cdd:smart00225  78 DYLQIPGLVELCEEFLLKL 96

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 10 (KCTD10); KCTD10, also called BTB/POZ domain-containing adapter for CUL3-mediated RhoA degradation protein 3 (BACURD3), is a BTB/POZ domain-containing protein that interacts with proliferating cell nuclear antigen (PCNA) and polymerase delta, and participates in DNA repair, DNA replication, and cell-cycle control. Its down-regulation could inhibit cell proliferation. KCTD10 also plays crucial roles in embryonic angiogenesis and heart development in mammals by negatively regulating the Notch signaling pathway. Furthermore, KCTD10 may function as a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex, which mediates the ubiquitination of target proteins, leading to their degradation by the proteasome. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD10 BTB domain forms a novel two-fold symmetric tetramer that is distinct from the tetramer formed by voltage-gated potassium (Kv) channels.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  26 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 105
Cdd:cd18399    1 GTSPSSKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 80

                         90       100       110
                 ....*....|....*....|....*....|.
gi 959092930 106 EELLAEAKYYLVQGLVEECQAALqQNKDTYE 136
Cdd:cd18399   81 EELLAEAKYYLVQGLVEECQAAL-QNKDTYE 110

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 13 (KCTD13); KCTD13, also called BTB/POZ domain-containing adapter for CUL3-mediated RhoA degradation protein 1 (BACURD1), or TNFAIP1-like protein, is a BTB/POZ domain-containing protein that may function as a substrate-specific adaptor of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex that mediates the ubiquitination of RhoA, leading to its degradation by the proteasome, thereby regulating the actin cytoskeleton and cell migration. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD13 BTB domain forms a novel two-fold symmetric tetramer that is distinct from the tetramer formed by voltage-gated potassium (Kv) channels.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  31 SKYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLA 110
Cdd:cd18400    1 SKYVKLNVGGSLHYTTVQTLTKQDTMLKAMFSGRVEVLTDSEGWVLIDRSGRHFGTILNYLRDGSVPLPESTRELEELLG 80

                         90       100
                 ....*....|....*....|...
gi 959092930 111 EAKYYLVQGLVEECQAALQQNKD 133
Cdd:cd18400   81 EARYYLVQGLVEDCQLALQQKRD 103

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Arabidopsis thaliana FH protein interacting protein FIP2 and similar proteins; FIP2 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. It contains a BTB/POZ domain, also known as tetramerization (T1) domain, which is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLP-ESRREIEELLAE 111
Cdd:cd18376    1 VKLNVGGQKFTTTLDTLTKdPDSMLAAMFSGRHSLKKDEDGSYFIDRDGTHFRHILNYLRDGEVKIPtEDRSVLKELLEE 80

                 ....*....
gi 959092930 112 AKYYLVQGL 120
Cdd:cd18376   81 AEYYQLRGL 89

BTB/POZ domain; In voltage-gated K+ channels this domain is responsible for subfamily-specific assembly of alpha-subunits into functional tetrameric channels. In KCTD1 this domain functions as a transcriptional repressor. It also mediates homomultimerization of KCTD1 and interaction of KCTD1 with the transcription factor AP-2-alpha.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930   34 VKLNVGGALYYTTMQTLTKQ-DTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGaVPLPESR-REIEELLAE 111
Cdd:pfam02214   1 VKLNVGGTRFETLKSTLTRFpDTRLGRLLELECDDYDDDTNEYFFDRSPKHFETILNFYRTG-GKLHRPEeVCLDEFLEE 79

                          90
                  ....*....|....
gi 959092930  112 AKYYLVQGL-VEEC 124
Cdd:pfam02214  80 AEFYGLDELaLELC 93

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing proteins, KCTD6, KCTD21 and similar proteins; KCTD6, also called KCASH3 (KCTD containing, Cullin3 adaptor, suppressor of Hedgehog 3), is a substrate-specific adaptor of cullin-3, effectively regulating protein levels of the muscle small ankyrin-1 isoform 5 (sAnk1.5). KCTD21, also called KCASH2, functions as a substrate-specific adaptor of cullin-3, promoting the ubiquitination and degradation of histone deacetylase HDAC1, thereby inhibiting the deacetylation-mediated transcriptional activation of the Hedgehog effectors Gli1 and Gli2. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLAEA 112
Cdd:cd18365    3 VNLNVGGVHYTTTLATLTRfPDSMLGAMFSGSMPTTRDDQGNYFIDRDGTLFRYILNFLRSSQLSLPEDFKEYDLLLREA 82

                         90
                 ....*....|.
gi 959092930 113 KYYLVQGLVEE 123
Cdd:cd18365   83 DFYQIEPLIEA 93

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing proteins, KCTD8, KCTD12, KCTD16 and similar proteins; This subfamily of KCTD proteins includes KCTD8, KCTD12 (also called predominantly fetal expressed T1 domain/Pfetin), and KCTD16. They act as auxiliary subunits of GABAB receptors associated with mood disorders. KCTD8 interacts as a tetramer with GABRB1 and GABRB2. KCTD12 regulates agonist potency and kinetics of GABAB receptor signaling. It promotes tumorigenesis by facilitating CDC25B/CDK1/Aurora A-dependent G2/M transition. KCTD16 interacts with amyloid beta precursor protein (APP), a type I transmembrane protein involved in a variety of cellular processes such as cell adhesion, and axon guidance. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTKQ-DTMLKAMFSG--RMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLA 110
Cdd:cd18367    5 VELNVGGQVYTTSLSTLIKDpDSLLGRMFSGknRQELARDSKGRYFLDRDGVLFRYILDYLRNQKLVLPENFPERERLKR 84

                         90
                 ....*....|....*.
gi 959092930 111 EAKYYLVQGLVEECQA 126
Cdd:cd18367   85 EAEYFQLPELVKALRA 100

Broad-Complex, Tramtrack and Bric a brac; Domain in Broad-Complex, Tramtrack and Bric a brac. Also known as POZ (poxvirus and zinc finger) domain. Known to be a protein-protein interaction motif found at the N-termini of several C2H2-type transcription factors as well as Shaw-type potassium channels. Known structure reveals a tightly intertwined dimer formed via interactions between N-terminal strand and helix structures. However in a subset of BTB/POZ domains, these two secondary structures appear to be missing. Be aware SMART predicts BTB/POZ domains without the beta1- and alpha1-secondary structures.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930    33 YVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEgWILIDRCGKHFGTILNYLRDGAVPLPESrrEIEELLAEA 112
Cdd:smart00225   1 DVTLVVGGKKFHAHKAVLAAHSPYFKALFSSDFKESDKSE-IYLDDVSPEDFRALLNFLYTGKLDLPEE--NVEELLELA 77

                           90
                   ....*....|....*....
gi 959092930   113 KYYLVQGLVEECQAALQQN 131
Cdd:smart00225  78 DYLQIPGLVELCEEFLLKL 96

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 6 (KCTD6); KCTD6, also called KCTD containing, Cullin3 adaptor, suppressor of Hedgehog 3 (KCASH3), is a BTB/POZ domain-containing protein that functions as a substrate-specific adaptor of cullin-3, regulating protein levels of the muscle small ankyrin-1 isoform 5 (sAnk1.5) as well as suppressing histone deacetylase and Hedgehog activity in medulloblastoma. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLAEA 112
Cdd:cd18394    5 VTLNVGGHLYTTSLSTLTRyPDSMLGAMFRGDFPTARDSQGNYFIDRDGPLFRYILNFLRTSELTLPVDFKEFDLLRKEA 84

                         90
                 ....*....|
gi 959092930 113 KYYLVQGLVE 122
Cdd:cd18394   85 DFYQIEPLIQ 94

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing proteins, KCTD1 and KCTD15; This subfamily of KCTD proteins includes KCTD1 and KCTD15. KCTD1 is a nuclear BTB/POZ domain-containing protein that acts as a transcriptional repressor and mediates protein-protein interactions through a BTB domain. It represses the transcriptional activity of AP-2 family members, including TFAP2A, TFAP2B and TFAP2C. It also functions as a novel inhibitor of the Wnt signaling pathway. Mutations in KCTD1 cause scalp-ear-nipple (SEN) syndrome. KCTD15 is a BTB/POZ domain-containing protein that plays a role in the regulation of neural crest (NC) formation and other steps in embryonic development. It inhibits AP2 transcriptional activity by interaction with its activation domain. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD1 BTB domains form pentamers.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTKQ-DTMLKAMFSGRMEVLTDS-EGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLAE 111
Cdd:cd18361    1 VHIDVGGHIYTSSLETLTKYpESRLGKLFNGSIPIVLDSlKQHYFIDRDGKMFRHILNFLRTSKLLLPDDFTEFDLLYEE 80

                         90
                 ....*....|..
gi 959092930 112 AKYYLVQGLVEE 123
Cdd:cd18361   81 ARYYELQPMVKQ 92

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein KCTD8; KCTD8, a BTB/POZ domain-containing protein, is an auxiliary subunit of GABA-B receptors that determine the pharmacology and kinetics of the receptor response. It interacts as a tetramer with GABRB1 and GABRB2. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  29 PSSKYVKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRM--EVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREI 105
Cdd:cd18396    1 PFPEVVELNVGGQVYVTKHSTLLSvPDSTLASMFSRRAarELPRDNRGRFFIDRDGFLFRYVLDYLRDKQLALPDHFPEK 80

                         90
                 ....*....|....*.
gi 959092930 106 EELLAEAKYYLVQGLV 121
Cdd:cd18396   81 ERLLREAEYFQLGDLV 96

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 17 (KCTD17); KCTD17 is a BTB/POZ domain-containing protein that functions as a substrate-adaptor for cullin3-RING ubiquitin ligases that polyubiquitylates trichoplein, a protein involved in ciliogenesis down-regulation. It is a positive regulator of ciliogenesis, playing a crucial role in the initial steps of axoneme extension. A missense mutation in KCTD17 causes autosomal dominant myoclonus-dystonia (M-D). The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD17 BTB domains form pentamers.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  32 KYVKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSE--GWILIDRCGKHFGTILNYLRDGAVPLPESRREiEELL 109
Cdd:cd18391    1 KWVRLNVGGTVFLTTRQTLCREQKSFLSRLCQGEELQSDRDetGAYLIDRDPTYFGPILNFLRHGKLVLDKDMAE-EGVL 79

                         90
                 ....*....|...
gi 959092930 110 AEAKYYLVQGLVE 122
Cdd:cd18391   80 EEAEFYNIGPLIR 92

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 15 (KCTD15); KCTD15 is a BTB/POZ domain-containing protein that plays a role in the regulation of neural crest (NC) formation and other steps in embryonic development. It inhibits AP2 transcriptional activity by interaction with its activation domain. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD1 BTB domains, closely related to KCTD15, form pentamers.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRMEVLTDS-EGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLAE 111
Cdd:cd18388    4 VHIDVGGHMYTSSLATLTKyPDSRISRLFNGTEPIVLDSlKQHYFIDRDGEIFRYILSFLRTSKLLLPEDFKDFNLLYEE 83

                         90
                 ....*....|....
gi 959092930 112 AKYYLVQGLVEECQ 125
Cdd:cd18388   84 AKYYQLQPMVKELE 97

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 12 (KCTD12); KCTD12, also called predominantly fetal expressed T1 domain (Pfetin), is a BTB/POZ domain-containing protein that is an auxiliary subunit of GABAB receptors associated with mood disorders. It regulates agonist potency and kinetics of GABAB receptor signaling. It promotes tumorigenesis by facilitating CDC25B/CDK1/Aurora A-dependent G2/M transition. It also regulates colorectal cancer cell stemness through the ERK pathway. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRM--EVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLA 110
Cdd:cd18397    5 VELNVGGQVYVTRHTTLVSvPDSLLWHMFSQQKpgELARDSKGRFFLDRDGFLFRYILDYLRDLQLVLPDYFPERSRLQR 84

                         90
                 ....*....|..
gi 959092930 111 EAKYYLVQGLVE 122
Cdd:cd18397   85 EAEFFQLPELVK 96

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in voltage-gated potassium (Kv) channels and potassium channel tetramerization domain-containing (KCTD) proteins; This family includes two protein groups: voltage-gated potassium (Kv) channels and potassium channel tetramerization domain-containing (KCTD) proteins. Kv channels are membrane proteins with fundamental physiological roles. They are responsible for a variety of electrical phenomena, such as the repolarization of the action potential, spike frequency adaptation, synaptic repolarization, and smooth muscle contraction. KCTD proteins play crucial roles in a variety of fundamental biological processes, such as protein ubiquitination and degradation, suppression of proliferation or transcription, cytoskeleton regulation, tetramerization and gating of ion channels, and others. All family members contain the BTB/POZ domain, also known as tetramerization (T1) domain, which is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFsGRMEVLTDSE--GWILIDRCGKHFGTILNYLRDGAVPLPESrREIEELLA 110
Cdd:cd18187    1 VVLNVSGTRFVTNRQTLTRhPDTLLGRMF-KPGREFTFPNetGEYFIDRDPTVFRTILNYYRTGKLNCPDG-ISIPDLRE 78

                 ....*
gi 959092930 111 EAKYY 115
Cdd:cd18187   79 ECDFY 83

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 3 (KCTD3); KCTD3, also called renal carcinoma antigen NY-REN-45, is a BTB/POZ domain-containing protein that is an accessory subunit of potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 3 (HCN3), upregulating its cell-surface expression and current density without affecting its voltage dependence and kinetics. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLT-KQDTMLKAMFSGRMEVLTDSEGWILIDRCGKHFGTILNYLRDGAVPLpeSRREIEELLAEA 112
Cdd:cd18392    4 IQLNVGGTRFSTSRQTLMwIPDSFFSSLLSGRISSLKDETGAIFIDRDPTAFVPILNFLRTKELDL--RGVNINVLRHEA 81

                 ...
gi 959092930 113 KYY 115
Cdd:cd18392   82 EFY 84

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 5 (KCTD5); KCTD5 is a BTB/POZ domain-containing protein that functions as a substrate adaptor for cullin3 based ubiquitin E3 ligases. It is a negative regulator of the AKT pathway, a key signaling cascade frequently deregulated in cancer. KCTD5 does not impact the operation of Kv4.2, Kv3.4, Kv2.1, or Kv1.2 channels. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. KCTD5 forms pentamers mediated by its BTB domain.

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                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  28 SPSSKYVKLNVGGALYYTTMQTLTKQ-DTMLKAMFSGRMEVLTDSE--GWILIDRCGKHFGTILNYLRDGAVPLPESRRE 104
Cdd:cd18390    1 GGVSKWVRLNVGGTYFLTTRQTLCRDpKSFLYRLCQADPDLDSDKDetGAYLIDRDPTYFGPVLNYLRHGKLVINKDLAE 80

                         90
                 ....*....|....*...
gi 959092930 105 iEELLAEAKYYLVQGLVE 122
Cdd:cd18390   81 -EGVLEEAEFYNITSLIK 97

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 1 (KCTD1); KCTD1 is a nuclear BTB/POZ domain-containing protein that acts as a transcriptional repressor and mediates protein-protein interactions through a BTB domain. It represses the transcriptional activity of AP-2 family members, including TFAP2A, TFAP2B and TFAP2C to various extent. It also functions as a novel inhibitor of the Wnt signaling pathway. Mutations in KCTD1 cause scalp-ear-nipple (SEN) syndrome. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization. The KCTD1 BTB domains form pentamers.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTK-QDTMLKAMFSGRMEVLTDS-EGWILIDRCGKHFGTILNYLRDGAVPLPESRREIEELLAE 111
Cdd:cd18387    5 VHIDVGGHMYTSSLATLTKyPESRIGRLFDGTEPIVLDSlKQHYFIDRDGQMFRYILNFLRTSKLLIPDDFKDYSLLYEE 84

                         90
                 ....*....|....
gi 959092930 112 AKYYLVQGLVEECQ 125
Cdd:cd18387   85 AKYFQLQPMLLELE 98

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain superfamily; Proteins in this superfamily are characterized by the presence of a common protein-protein interaction motif of about 100 amino acids, known as the BTB/POZ domain. Members include transcription factors, oncogenic proteins, ion channel proteins, and potassium channel tetramerization domain (KCTD) proteins. They have been identified in poxviruses and many eukaryotes, and have diverse functions, such as transcriptional regulation, chromatin remodeling, protein degradation and cytoskeletal regulation. Many BTB/POZ proteins contain one or two additional domains, such as kelch repeats, zinc-finger domains, FYVE (Fab1, YOTB, Vac1, and EEA1) fingers, or ankyrin repeats, among others. These special additional domains or interaction partners provide unique characteristics and functions to BTB/POZ proteins. In ion channel proteins and KCTD proteins, the BTB/POZ domain is also called the tetramerization (T1) domain.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  34 VKLNVGGALYYTTMQTLTKQDTMLKAMFSGRMEVLTDSEgwILIDRCGKH-FGTILNYLRDGAVPLPESrrEIEELLAEA 112
Cdd:cd01165    1 VVLVVEGEKFHVNKELLAQSSEYFRALFRGGFRESGQAE--INLRDISPEdFRALLEFLYGGKRDLDAS--NLLELLEAA 76

                 ...
gi 959092930 113 KYY 115
Cdd:cd01165   77 NFL 79

second BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in potassium channel tetramerization domain-containing protein 19 (KCTD19); KCTD19 is a BTB/POZ domain-containing protein with unclear biological function. It may be a host factor involved in Nef-induced downregulation of MHC-I. Nef is a HIV-1-encoded protein that plays a key role in the development of AIDS. KCTD19 contains two BTB domains. This model corresponds to the second domain. The BTB/POZ domain, also known as tetramerization (T1) domain, is a versatile protein-protein interaction motif that facilitates homodimerization or heterodimerization. KCTD family BTB domains can adopt a wide range of oligomerization geometries, including homodimerization, tetramerization, and pentamerization.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 959092930  32 KYVKLNVGGALYYTTMQTLTKQDtmlkamfsgrmEVLTDSEG--WI------LIDRCGKHFGTILNYLRDGAVPLPESRR 103
Cdd:cd18374    1 QIVKVYVGSHWYATYLKTLLKYP-----------ELLSNSKKvrWItygqtlLISGDGQMFRHILNFLRLGKLLLPSEFK 69

                         90       100
                 ....*....|....*....|....*.
gi 959092930 104 EIEELLAEAKYYLVQGLVE---ECQA 126
Cdd:cd18374   70 EWPLLCQEVEEYQIPALSEalrQCEA 95