BACK (BTB and C-terminal Kelch) domain found in speckle-type POZ protein-like (SPOPL); SPOPL, also termed HIB homolog 2, or Roadkill homolog 2, is a component of a cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex that mediates the ubiquitination and subsequent proteasomal degradation of target proteins. The complexes containing homodimeric SPOPL or the heterodimer formed by speckle-type POZ protein (SPOP) and SPOPL are less efficient than ubiquitin ligase complexes containing only SPOP.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 222 LSVENVADTLVLADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNNNQATDIMETSGWKSMIQSHPHLVAEAFRALAS 301
Cdd:cd18519    1 LSVENVADTLILADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNSNHATDIMETAGWKSMIHSHPHLVAEAFRALAS 80

                         90
                 ....*....|....*.
gi 260267813 302 SQCPQFGIPRKRLKQS 317
Cdd:cd18519   81 AQCPPFGIPRKRLKQS 96

BACK (BTB and C-terminal Kelch) domain found in speckle-type POZ protein-like (SPOPL); SPOPL, also termed HIB homolog 2, or Roadkill homolog 2, is a component of a cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex that mediates the ubiquitination and subsequent proteasomal degradation of target proteins. The complexes containing homodimeric SPOPL or the heterodimer formed by speckle-type POZ protein (SPOP) and SPOPL are less efficient than ubiquitin ligase complexes containing only SPOP.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 222 LSVENVADTLVLADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNNNQATDIMETSGWKSMIQSHPHLVAEAFRALAS 301
Cdd:cd18519    1 LSVENVADTLILADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNSNHATDIMETAGWKSMIHSHPHLVAEAFRALAS 80

                         90
                 ....*....|....*.
gi 260267813 302 SQCPQFGIPRKRLKQS 317
Cdd:cd18519   81 AQCPPFGIPRKRLKQS 96

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 260267813   126 DCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKY 205
Cdd:smart00225   1 DVTLVVGGKKFHAHKAVLAAHSPYFKALFSSDFKESDKSEIYLDDVSPEDFRALLNFLYTGKLDLPEENVEELLELADYL 80

                           90
                   ....*....|....*..
gi 260267813   206 ALERLKVMCEEALCSNL 222
Cdd:smart00225  81 QIPGLVELCEEFLLKLL 97

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.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 107 PECRLAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTG 186
Cdd:cd18279    1 PECRLAEDLGNLWENSRFTDCCLCVGGQEFQAHKAILAARSPVFSAMFEHEMEESKKNRVEINDVDPEVFKEMMRFIYTG 80

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 260267813 187 KAPNLDKMADNLLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18279   81 KAPNLDKMADDLLAAADKYALERLKVMCEDALCSNLSVEN 120

BACK (BTB and C-terminal Kelch) domain found in speckle-type POZ protein-like (SPOPL); SPOPL, also termed HIB homolog 2, or Roadkill homolog 2, is a component of a cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex that mediates the ubiquitination and subsequent proteasomal degradation of target proteins. The complexes containing homodimeric SPOPL or the heterodimer formed by speckle-type POZ protein (SPOP) and SPOPL are less efficient than ubiquitin ligase complexes containing only SPOP.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 222 LSVENVADTLVLADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNNNQATDIMETSGWKSMIQSHPHLVAEAFRALAS 301
Cdd:cd18519    1 LSVENVADTLILADLHSAEQLKAQAIDFINRCSVLRQLGCKDGKNWNSNHATDIMETAGWKSMIHSHPHLVAEAFRALAS 80

                         90
                 ....*....|....*.
gi 260267813 302 SQCPQFGIPRKRLKQS 317
Cdd:cd18519   81 AQCPPFGIPRKRLKQS 96

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in TD and POZ domain-containing proteins (TDPOZ); TDPOZ is a family of bipartite animal and plant proteins that contains a tumor necrosis factor receptor-associated factor (TRAF) domain (TD) and a POZ/BTB domain. TDPOZ proteins may be nuclear scaffold proteins probably involved in transcription regulation in early development and other cellular processes. This subfamily contains only mammalian members. Plant TDPOZ proteins contain a MATH domain at the N-terminal region and are named "BTB/POZ and MATH domain-containing proteins (BPM)", not included in this subfamily. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 104 LKVPECRLAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFV 183
Cdd:cd18344    3 IKDPRHMLTDDLGELWENSLFTDCCLLVAGHEFRAHKAILAARSPVFRAMFEHEMEERLKNPIEIHDLDPQVFKEMMGFI 82

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*
gi 260267813 184 YTGKAPNLD--KMADNLLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18344   83 YTGKAPHLHshSMACDVLAAADKYGLEGLKVLCEDALCRNLSVEN 127

BACK (BTB and C-terminal Kelch) domain found in Drosophila melanogaster protein roadkill and similar proteins; Drosophila melanogaster protein roadkill, also termed 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.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 222 LSVENVADTLVLADLHSAEQLKAQAIDFINrcsvlrqlgckdgknwnnNQATDIMETSGWKSMIQSHPHLVAEAFRALAS 301
Cdd:cd18520    1 LSVETAAEVLILADLHSADQLKAQAIDFIN------------------THATDVMETAGWKSMIRTHPHLLAEAFRALAT 62

                         90
                 ....*....|..
gi 260267813 302 SQCPQFGIPRKR 313
Cdd:cd18520   63 QQIPPIGPPRKR 74

BACK (BTB and C-terminal Kelch) 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 complex that mediates 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 domain. TDPOZ proteins may be nuclear scaffold proteins involved in transcription regulation in early development and other cellular processes. Drosophila melanogaster protein roadkill, also termed 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.

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 260267813 222 LSVENVADTLVLADLHSAEQLKAQAIDFINRCsvlrqlgckdgknwnnnqATDIMETSGWKSMIQSHPHLVAEAFRA 298
Cdd:cd14821    1 LSVENAAEVLVLADLHSAEQLKTHAIDFINSH------------------ATDVMETEGWKSMVRSHPHLVAEAFRA 59

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        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 111 LAEDLGNLWENTRFTDCCFFV--RGKEFKAHKSVLAARSPVFNAMF-EHEMEECTKNRVEINDLDPEVFKEMMRFVYTGK 187
Cdd:cd18294    1 FAADMKSLINNPEFSDVKFLVgpERQEIFAHKCILAARCEVFRAMFlTGPQKESTQSPLVLSDIEPEVFRAVLEFIYTNC 80

                         90       100
                 ....*....|....*....|....*....
gi 260267813 188 APNLDKMADNLLAAADKYALERLKVMCEE 216
Cdd:cd18294   81 VTLSNHTVIEVLAAAVEYGLDELRKLCER 109

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 260267813   126 DCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKY 205
Cdd:smart00225   1 DVTLVVGGKKFHAHKAVLAAHSPYFKALFSSDFKESDKSEIYLDDVSPEDFRALLNFLYTGKLDLPEENVEELLELADYL 80

                           90
                   ....*....|....*..
gi 260267813   206 ALERLKVMCEEALCSNL 222
Cdd:smart00225  81 QIPGLVELCEEFLLKLL 97

BTB (Broad-Complex, Tramtrack and Bric a brac) /POZ (poxvirus and zinc finger) domain found in plant ARM repeat protein interacting with ABF2 (ARIA) and similar proteins; 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, a transcription factor which controls ABA-dependent gene expression via the G-box-type ABA-responsive elements. ARIA is a novel abscisic acid signaling component. It negatively regulates seed germination and young seedling growth. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 121 NTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLA 200
Cdd:cd18352   10 NATLSDVTFLVEGRRFYAHRIALLASSDAFRAMFDGGYREKEARDIEIPNIRWEVFELMMRFIYTGSVDITNDIAKDLLR 89

                         90       100
                 ....*....|....*....|....*..
gi 260267813 201 AADKYALERLKVMCEEALCSNLSVENV 227
Cdd:cd18352   90 AADQYLLEGLKRLCEYTIAQDLTLENI 116

BTB (Broad-Complex, Tramtrack and Bric a brac) /POZ (poxvirus and zinc finger) domain found in Dictyostelium discoideum trishanku and similar proteins; Trishanku is a novel regulator required for normal morphogenesis and cell-type stability in Dictyostelium discoideum. It contains a BTB domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 120 ENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKA-PNLDKMADnL 198
Cdd:cd18314    2 NDSEFSDVVLCVGDRKFFAHRIVLCARSPVFRSMLTGSMIESNLKEVTLEDVEPEIFETVLKYMYTGQVtLSEENVLD-L 80

                         90
                 ....*....|....*.
gi 260267813 199 LAAADKYALERLKVMC 214
Cdd:cd18314   81 LMLASKYQVPDLEKLC 96

second BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in BTB/POZ domain-containing protein 8 (BTBD8); BTBD8 is a BTB-domain-containing Kelch-like protein that may play a role in developmental processes. It may also act as a protein-protein adaptor in a transcription complex and thus be involved in brain development. BTBD8 contains two BTB domains. This model corresponds to the second domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 109 CRLAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYtGKA 188
Cdd:cd18286    2 SRLGKDLLQLFLNGEDSDITIKVDGKTFKAHRCILCARSSYFAAMLSGSWAESNSSEITLTGVSHAAVSFVLLFIY-GGV 80

                         90       100
                 ....*....|....*....|....*
gi 260267813 189 PNLDKMAD--NLLAAADKYALERLK 211
Cdd:cd18286   81 LDLPDDVNlgELLSLADMYGLDGLK 105

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        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 110 RLAEDLG---NLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTG 186
Cdd:cd18237    4 LLADFMGvmnNMRKQKTLCDVILIVEGREIKAHRVVLAAASHFFHLMFTSNMTESKSSEVELKDAEPDIIELLVEFAYTA 83

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 260267813 187 KAPNLDKMADNLLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18237   84 RISVNSNNVQSLLDAANQYQIEPVKKMCVDFLKEQLDASN 123

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        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 115 LGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKapnLDKM 194
Cdd:cd18256   11 LNKLRGQHEFCDVQLQVGMELFSVHRLVLAASSPYFAALFAGGMSESSKDVVQIHGVEPDIFHILLDFIYTGV---VEVT 87

                         90       100       110
                 ....*....|....*....|....*....|....*
gi 260267813 195 ADN---LLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18256   88 VSNvqeLLVAADMLQLTEVVEICCEFLKGQLHPSN 122

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in rabankyrin-5 (Rank-5); Rank-5, also called ankyrin repeat and FYVE domain-containing protein 1 (ANKFY1) or ankyrin repeats hooked to a zinc finger motif (ANKHZN), is a Rab5 effector that regulates and coordinates different endocytic mechanisms. It contains an N-terminal BTB domain, followed by a BACK domain, several ankyrin (ANK) repeats and a C-terminal FYVE domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 110 RLAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAmfeheMEECTKNRVEINDLDPEVFKEMMRFVYTGKAP 189
Cdd:cd18303    4 RLLKTVASLFDKELYSDITIKLADKSIPAHKFVLAARSEKWSN-----ENLASTNELDLSDISYEVVLALLRWLYTDELD 78

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|.
gi 260267813 190 nlDKMADN----LLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18303   79 --LTLDDEflleLMKAAKRFQLTDLVERCERALMSSVNVDN 117

second BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Rho-related BTB domain-containing proteins (RhoBTB); RhoBTB proteins constitute a subfamily of atypical members within the Rho family of small guanosine triphosphatases (GTPases), which is characterized by containing a GTPase domain (in most cases, non-functional) followed by a proline-rich region, a tandem of 2 BTB domains, and a conserved C-terminal region. In humans, the RhoBTB subfamily consists of 3 isoforms: RhoBTB1, RhoBTB2, and RhoBTB3. Orthologs are present in several other eukaryotes, such as Drosophila and Dictyostelium, but have been lost in plants and fungi. This model corresponds to the second BTB domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 124 FTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAP---NLDKMadNLLA 200
Cdd:cd18300    9 FSDVTFIVEDGTIPAHKALLVARCDVMAAMFGGNFRESSAKEVELPGVSKETFLALLEYLYTDQAPileDGDCV--GLIV 86

                         90
                 ....*....|....*
gi 260267813 201 AADKYALERLKVMCE 215
Cdd:cd18300   87 LANRLCLPRLVALCE 101

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        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 111 LAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPN 190
Cdd:cd18269   14 LQDGLKDLLDENKFVDCVLKIGDKEFPCHRLVLAACSPYFRAMFLSDLEESKKKEVVLEDVDPDVMGMILKYLYTSEIDL 93

                         90       100       110
                 ....*....|....*....|....*....|....*.
gi 260267813 191 LDKMADNLLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18269   94 NDQNVQDIFALASRFQIPSIFTVCVSYLQKRLSLSN 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        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 118 LWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKapnLDKMADN 197
Cdd:cd18238    9 FYENGELCDVTLKVGEKSIHCHRLVLACVSPYFRAMFTSEMAESKQDSITIKDIDEEAVELLVDFAYTGK---LTLTVDN 85

                         90       100       110
                 ....*....|....*....|....*....|..
gi 260267813 198 ---LLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18238   86 vqsLLYAASLLQVEEVAKACCEFMKDHLHPSN 117

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 38 (KLHL38); KLHL38 contains a BTB domain and kelch repeats, characteristics of a kelch family protein. Its function remains unclear. The KLHL38 gene is significantly up-regulated during diapause, a temporary arrest of development during early ontogeny. It may also function in preadipocyte differentiation in the chicken. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 109 CRLAEDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKA 188
Cdd:cd18268    8 SELLRQLNSLRQERILTDVILCTGDKEIPCHRNVLASSSPYFRAMFCNNFRESSQAKVDLKGIDSDVLDQIVDYVYTGEI 87

                         90       100       110
                 ....*....|....*....|....*....|....*...
gi 260267813 189 PNLDKMADNLLAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18268   88 LITRDNVLPLMEAASMLQYPKLFEACSLYLQDQLTPEN 125

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 18 (KLHL18); KLHL18 acts as a substrate-specific adaptor for a Cullin3 E3 ubiquitin-protein ligase complex that regulates mitotic entry and ubiquitylates Aurora-A. 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        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 126 DCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKY 205
Cdd:cd18247   21 DVTLKVGDQKFSAHRIVLAATIPYFHAMFTHDMVESKQDEITMQGIEPSALEALINFAYSGRIAIDTSNVQSLLVGASFL 100

                         90
                 ....*....|...
gi 260267813 206 ALERLKVMCEEAL 218
Cdd:cd18247  101 QLQSVKDACCEFL 113

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
                 ....*....|....*....|....*....|....*....|....*....|...
gi 260267813 134 KEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTG 186
Cdd:cd18248   35 EEFMAHKVVLASSSPYFKAMFTSGLRECGMEVVPIEGVHPCVMSRLIEFAYTA 87

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.

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                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 118 LWENTRFTDCCFFV----RGKEFKAHKSVLAARSPVFNAMFEHEMEEcTKNRVEINDLDPEVFKEMMRFVYTGKapnLDK 193
Cdd:cd18282    1 MFNNELMADVHFIVgppgGTQRIPAHKYVLATGSSVFYAMFYGGLAE-NKNEIEIPDVEPAAFLNLLRYLYCDE---IDL 76

                         90       100       110
                 ....*....|....*....|....*....|..
gi 260267813 194 MADNLLA---AADKYALERLKVMCEEALCSNL 222
Cdd:cd18282   77 EPDTVLAtlyAAKKYLVPHLARACVQFLETSL 108

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in BTB/POZ domain-containing proteins, BTBD1 and BTBD2; This family 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 of cell survival. BTBD1 and BTBD2 colocalize to cytoplasmic bodies with the RBCC/tripartite motif protein, TRIM5delta. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

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                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 260267813 111 LAEDLGNLWENTRFTDCcFFVRGKE-----FKAHKSVLAARSPVFNAMFEHEMEEcTKNRVEINDLDPEVFKEMMRFVYT 185
Cdd:cd18281    9 VKERFAFLFNNETLSDV-HFIVGKGdneqrIPAHKFVLSIGSAVFDAMFNGGMAT-TSAEIELPDVEPAAFLALLRFLYS 86

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....
gi 260267813 186 GKapnLDKMADNL---LAAADKYALERLKVMCEEALCSNLSVEN 226
Cdd:cd18281   87 DE---VQIGPETVmttLYTAKKYAVPALESACVEFLKKNLSSDN 127

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like proteins, KLHL2 and KLHL3; The family includes Kelch-like proteins, KLHL2 and KLHL3. KLHL2 is a novel actin-binding protein predominantly expressed in brain. It plays a role in the reorganization of the actin cytoskeleton, and promotes growth of cell projections in oligodendrocyte precursors. KLHL2 and KLHL3 each functions as a component of an E3 ubiquitin ligase complex that mediates the ubiquitination of target proteins. They contain 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 260267813 133 GKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKYALERLKV 212
Cdd:cd18235   30 GVEIPAHRVVLASCSPYFHAMFTGDLSESRANRVTLQDVDGKALLLLIDYVYTAEIQVTEENVQVLLPAANLLQLTDVRD 109

                         90
                 ....*....|
gi 260267813 213 MCEEALCSNL 222
Cdd:cd18235  110 ACCDFLQSQL 119

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 260267813 133 GKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKYALERLKV 212
Cdd:cd18273   43 GRLFPCNRNVLAAASPYFKSMFTGGLYESKQETVTIHDVDSESMALIIDYCYTGRVTLSEANVQRLYAAANMLQLEYVRE 122

                         90
                 ....*....|....*....
gi 260267813 213 MCEEALCSNLSVENVADTL 231
Cdd:cd18273  123 ACASFLARRLDLSNCVGIL 141

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.

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                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 260267813 131 VRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKY 205
Cdd:cd01165    5 VEGEKFHVNKELLAQSSEYFRALFRGGFRESGQAEINLRDISPEDFRALLEFLYGGKRDLDASNLLELLEAANFL 79

BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Kelch-like protein 17 (KLHL17); KLHL17, also called actinfilin, is a substrate-recognition component of some cullin-RING-based BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complexes. It acts as a Cullin 3 (Cul3) substrate adaptor that links GLUR6 to the E3 ubiquitin-ligase complex, and mediates the ubiquitination and subsequent degradation of GLUR6. It may play a role in actin-based neuronal function. 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 260267813 126 DCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMEECTKNRVEINDLDPEVFKEMMRFVYTGKAPNLDKMADNLLAAADKY 205
Cdd:cd18246   41 DIVLHVGTKEIKAHKVVLASCSPYFHAMFTNEMSESRQTHVTLHDIDPQALEQLVQYAYTAEIVVGEGNVQTLLPAASLL 120

                         90
                 ....*....|....*..
gi 260267813 206 ALERLKVMCEEALCSNL 222
Cdd:cd18246  121 QLNGVRDACCKFLLSQL 137

first BTB (Broad-Complex, Tramtrack and Bric a brac)/POZ (poxvirus and zinc finger) domain found in Ankyrin repeat and BTB/POZ domain-containing protein 1 (ABTB1); ABTB1, also called elongation factor 1A-binding protein or bood POZ containing gene type 1 (BPOZ-1), is an anti-proliferative factor that may act as a mediator of the phosphatase and tensin homolog (PTEN) growth-suppressive signaling pathway. It may play a role in developmental processes. ABTB1 contains an ankyrin repeat and two BTB domains. This model corresponds to the first BTB domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 260267813 113 EDLGNLWENTRFTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEHEMeectKNRVEIN----DLDPEVFKEMMRFVYTG 186
Cdd:cd18295    8 EFLRRLLEQGSYSDVTFNVHGESFPAHRCILSARSPYFAEMFETKW----KDKREINlkhpLVNPDAFRALLQYLYTG 81

BTB (Broad-Complex, Tramtrack and Bric a brac) /POZ (poxvirus and zinc finger) domain found in Drosophila melanogaster proteins bric-a-brac 1 (BAB1), bric-a-brac 2 (BAB2), modifier of mdg4 (doom), and similar proteins; BAB1 and BAB2 probably act as transcriptional regulators that are required for specification of the tarsal segment and are involved in antenna development. Doom is a product of the Drosophila mod(mdg4) gene. It induces apoptosis and binds to baculovirus inhibitor-of-apoptosis proteins. This subfamily also includes Drosophila melanogaster sex determination protein fruitless (FRU), protein jim lovell (LOV), zinc finger protein chinmo, transcription factor GAGA, transcription factor Ken, and longitudinals lacking proteins (LOLA). FRU probably acts as a transcriptional regulator that plays a role in male courtship behavior and sexual orientation, and enhances male-specific expression of takeout in brain-associated fat body. LOV, also called tyrosine kinase-related (TKR), has a regulatory role during midline cell development. Chinmo is a functional effector of the JAK/STAT pathway that regulates eye development, tumor formation, and stem cell self-renewal in Drosophila. GAGA is a transcriptional activator that functions by regulating chromatin structure. Ken, also termed protein Ken and Barbie, is a transcription factor required for Terminalia development. LOLA proteins are putative transcription factors required for axon growth and guidance in the central and peripheral nervous systems. Proteins in this subfamily contain a BTB domain. The BTB/POZ domain is a common protein-protein interaction motif of about 100 amino acids.

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 260267813 124 FTDCCFFVRGKEFKAHKSVLAARSPVFNAMFEhEMEECTKNRVEINDLDPEVFKEMMRFVYTGK 187
Cdd:cd18315    1 LVDVTLACEGGSLKAHKLVLAAASPYFAALLK-ETPPDEHPVIILPDVPYSELKALLDFIYTGE 63