F-box domain found in F-box/WD repeat-containing protein 1B (FBXW1B) and similar proteins; FBXW1B, also called F-box/WD repeat-containing protein 11 (FBXW11), F-box and WD repeats protein beta-TrCP2, or homologous to Slimb protein (HOS), is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins, such as IFNAR1, CEP68 and CDC25A, as well as phosphorylated CTNNB1, NFKBIA, PER1 and PER2. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 1958658235  84 QRDFITALPEQGLDHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKK 134
Cdd:cd22183     1 QRDFITALPAKGLDHIAENILSYLDAESLCAAELVCKEWQRVISEGMLWKK 51

WD40 domain, found in a number of eukaryotic proteins that cover a wide variety of functions including adaptor/regulatory modules in signal transduction, pre-mRNA processing and cytoskeleton assembly; typically contains a GH dipeptide 11-24 residues from its N-terminus and the WD dipeptide at its C-terminus and is 40 residues long, hence the name WD40; between GH and WD lies a conserved core; serves as a stable propeller-like platform to which proteins can bind either stably or reversibly; forms a propeller-like structure with several blades where each blade is composed of a four-stranded anti-parallel b-sheet; instances with few detectable copies are hypothesized to form larger structures by dimerization; each WD40 sequence repeat forms the first three strands of one blade and the last strand in the next blade; the last C-terminal WD40 repeat completes the blade structure of the first WD40 repeat to create the closed ring propeller-structure; residues on the top and bottom surface of the propeller are proposed to coordinate interactions with other proteins and/or small ligands; 7 copies of the repeat are present in this alignment.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 208 SKGVYCLQYDDDK--IISGLRDNSIKIWDKSSLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWDVNTGEVLNT 283
Cdd:cd00200     9 TGGVTCVAFSPDGklLATGSGDGTIKVWDLETGELLRTLKGHTGPVRDVAAsaDGTYLASGSSDKTIRLWDLETGECVRT 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 284 LIHHNEAVLHLRFS--NGLMVTCSKDRSIAVWDMASAtdiTLRRVLVGHRAAVNVVDF--DDKYIVSASGDRTIKVWSTS 359
Cdd:cd00200    89 LTGHTSYVSSVAFSpdGRILSSSSRDKTIKVWDVETG---KCLTTLRGHTDWVNSVAFspDGTFVASSSQDGTIKLWDLR 165

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 360 TCEFVRTLNGHKRGIACLQYRD--RLVVSGSSDNTIRLWDIECGACLRVLEGHEELVRCIRFDNKR--IVSGAYDGKIKV 435
Cdd:cd00200   166 TGKCVATLTGHTGEVNSVAFSPdgEKLLSSSSDGTIKLWDLSTGKCLGTLRGHENGVNSVAFSPDGylLASGSEDGTIRV 245

                         250       260       270       280       290
                  ....*....|....*....|....*....|....*....|....*....|...
gi 1958658235 436 WDLQaaldprapaSTLCLRTLVEHSGRVFRLQF--DEFQIISSSHDDTILIWD 486
Cdd:cd00200   246 WDLR---------TGECVQTLSGHTNSVTSLAWspDGKRLASGSADGTIRIWD 289

D domain of beta-TrCP; This domain is found in eukaryotes, and is approximately 40 amino acids in length. It is found associated with pfam00646, pfam00400. The protein that contains this domain functions as a ubiquitin ligase. Ubiquitination is required to direct proteins towards the proteasome for degradation. This protein is part of the WD40 class of F box proteins. The D domain of these F box proteins is involved in mediating the dimerization of the protein. dimerization is necessary to polyubiquitinate substrates so this D domain is vital in directing substrates towards the proteasome for degradation.

                          10        20        30
                  ....*....|....*....|....*....|....*....
gi 1958658235  46 KYFDQWSESDQVEFVEHLISRMCHYQHGHINSYLKPMLQ 84
Cdd:pfam12125   1 KYFDKWNESDQVDFVEHLLSRMCHYQHGHINSYLKPMLQ 39

protein SPA1-RELATED; Provisional

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 344 IVSASGDRTIKVWSTSTCEFVRTLNGHKRGIACLQYRD---RLVVSGSSDNTIRLWDIECGACLRVLEGHEELVrCIRFD 420
Cdd:PLN00181  548 VASSNFEGVVQVWDVARSQLVTEMKEHEKRVWSIDYSSadpTLLASGSDDGSVKLWSINQGVSIGTIKTKANIC-CVQFP 626

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 421 N---KRIVSGAYDGKIKVWDLQaalDPRAPastLClrTLVEHSGRVFRLQF-DEFQIISSSHDDTILIWDfLNVPPSAQN 496
Cdd:PLN00181  627 SesgRSLAFGSADHKVYYYDLR---NPKLP---LC--TMIGHSKTVSYVRFvDSSTLVSSSTDNTLKLWD-LSMSISGIN 697

                         170
                  ....*....|
gi 1958658235 497 ETrsPSRTYT 506
Cdd:PLN00181  698 ET--PLHSFM 705

WD40 repeats; Note that these repeats are permuted with respect to the structural repeats (blades) of the beta propeller domain.

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958658235  237 SLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWD 274
Cdd:smart00320   1 SGELLKTLKGHTGPVTSVAFspDGKYLASGSDDGTIKLWD 40

A Receptor for Ubiquitination Targets;

                           10        20        30
                   ....*....|....*....|....*....|....*....
gi 1958658235   97 DHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:smart00256   3 DEILEEILSKLDPKDLLRLRKVSRKWRSLIDSHDFWFKL 41

WD40 domain, found in a number of eukaryotic proteins that cover a wide variety of functions including adaptor/regulatory modules in signal transduction, pre-mRNA processing and cytoskeleton assembly; typically contains a GH dipeptide 11-24 residues from its N-terminus and the WD dipeptide at its C-terminus and is 40 residues long, hence the name WD40; between GH and WD lies a conserved core; serves as a stable propeller-like platform to which proteins can bind either stably or reversibly; forms a propeller-like structure with several blades where each blade is composed of a four-stranded anti-parallel b-sheet; instances with few detectable copies are hypothesized to form larger structures by dimerization; each WD40 sequence repeat forms the first three strands of one blade and the last strand in the next blade; the last C-terminal WD40 repeat completes the blade structure of the first WD40 repeat to create the closed ring propeller-structure; residues on the top and bottom surface of the propeller are proposed to coordinate interactions with other proteins and/or small ligands; 7 copies of the repeat are present in this alignment.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 208 SKGVYCLQYDDDK--IISGLRDNSIKIWDKSSLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWDVNTGEVLNT 283
Cdd:cd00200     9 TGGVTCVAFSPDGklLATGSGDGTIKVWDLETGELLRTLKGHTGPVRDVAAsaDGTYLASGSSDKTIRLWDLETGECVRT 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 284 LIHHNEAVLHLRFS--NGLMVTCSKDRSIAVWDMASAtdiTLRRVLVGHRAAVNVVDF--DDKYIVSASGDRTIKVWSTS 359
Cdd:cd00200    89 LTGHTSYVSSVAFSpdGRILSSSSRDKTIKVWDVETG---KCLTTLRGHTDWVNSVAFspDGTFVASSSQDGTIKLWDLR 165

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 360 TCEFVRTLNGHKRGIACLQYRD--RLVVSGSSDNTIRLWDIECGACLRVLEGHEELVRCIRFDNKR--IVSGAYDGKIKV 435
Cdd:cd00200   166 TGKCVATLTGHTGEVNSVAFSPdgEKLLSSSSDGTIKLWDLSTGKCLGTLRGHENGVNSVAFSPDGylLASGSEDGTIRV 245

                         250       260       270       280       290
                  ....*....|....*....|....*....|....*....|....*....|...
gi 1958658235 436 WDLQaaldprapaSTLCLRTLVEHSGRVFRLQF--DEFQIISSSHDDTILIWD 486
Cdd:cd00200   246 WDLR---------TGECVQTLSGHTNSVTSLAWspDGKRLASGSADGTIRIWD 289

WD40 repeat [General function prediction only];

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 208 SKGVYCLQYDDD--KIISGLRDNSIKIWDKSSLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWDVNTGEVLNT 283
Cdd:COG2319   162 SGAVTSVAFSPDgkLLASGSDDGTVRLWDLATGKLLRTLTGHTGAVRSVAFspDGKLLASGSADGTVRLWDLATGKLLRT 241

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 284 LIHHNEAVLHLRFS-NG-LMVTCSKDRSIAVWDMASAtdiTLRRVLVGHRAAVNVVDF--DDKYIVSASGDRTIKVWSTS 359
Cdd:COG2319   242 LTGHSGSVRSVAFSpDGrLLASGSADGTVRLWDLATG---ELLRTLTGHSGGVNSVAFspDGKLLASGSDDGTVRLWDLA 318

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 360 TCEFVRTLNGHKRGIACLQYR--DRLVVSGSSDNTIRLWDIECGACLRVLEGHEELVRCIRF--DNKRIVSGAYDGKIKV 435
Cdd:COG2319   319 TGKLLRTLTGHTGAVRSVAFSpdGKTLASGSDDGTVRLWDLATGELLRTLTGHTGAVTSVAFspDGRTLASGSADGTVRL 398

                  ....
gi 1958658235 436 WDLQ 439
Cdd:COG2319   399 WDLA 402

WD40 domain, found in a number of eukaryotic proteins that cover a wide variety of functions including adaptor/regulatory modules in signal transduction, pre-mRNA processing and cytoskeleton assembly; typically contains a GH dipeptide 11-24 residues from its N-terminus and the WD dipeptide at its C-terminus and is 40 residues long, hence the name WD40; between GH and WD lies a conserved core; serves as a stable propeller-like platform to which proteins can bind either stably or reversibly; forms a propeller-like structure with several blades where each blade is composed of a four-stranded anti-parallel b-sheet; instances with few detectable copies are hypothesized to form larger structures by dimerization; each WD40 sequence repeat forms the first three strands of one blade and the last strand in the next blade; the last C-terminal WD40 repeat completes the blade structure of the first WD40 repeat to create the closed ring propeller-structure; residues on the top and bottom surface of the propeller are proposed to coordinate interactions with other proteins and/or small ligands; 7 copies of the repeat are present in this alignment.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 240 CLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWDVNTGEVLNTLIHHNEAVLHLRFS--NGLMVTCSKDRSIAVWDM 315
Cdd:cd00200     1 LRRTLKGHTGGVTCVAFspDGKLLATGSGDGTIKVWDLETGELLRTLKGHTGPVRDVAASadGTYLASGSSDKTIRLWDL 80

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 316 ASAtdiTLRRVLVGHRAAVNVVDF--DDKYIVSASGDRTIKVWSTSTCEFVRTLNGHKRGIACLQYR--DRLVVSGSSDN 391
Cdd:cd00200    81 ETG---ECVRTLTGHTSYVSSVAFspDGRILSSSSRDKTIKVWDVETGKCLTTLRGHTDWVNSVAFSpdGTFVASSSQDG 157

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 392 TIRLWDIECGACLRVLEGHEELVRCIRF--DNKRIVSGAYDGKIKVWDLQaaldprapaSTLCLRTLVEHSGRVFRLQFD 469
Cdd:cd00200   158 TIKLWDLRTGKCVATLTGHTGEVNSVAFspDGEKLLSSSSDGTIKLWDLS---------TGKCLGTLRGHENGVNSVAFS 228

                         250       260
                  ....*....|....*....|..
gi 1958658235 470 EFQ--IISSSHDDTILIWDFLN 489
Cdd:cd00200   229 PDGylLASGSEDGTIRVWDLRT 250

WD40 repeat [General function prediction only];

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 208 SKGVYCLQY--DDDKIISGLRDNSIKIWDKSSLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWDVNTGEVLNT 283
Cdd:COG2319   246 SGSVRSVAFspDGRLLASGSADGTVRLWDLATGELLRTLTGHSGGVNSVAFspDGKLLASGSDDGTVRLWDLATGKLLRT 325

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 284 LIHHNEAVLHLRFS--NGLMVTCSKDRSIAVWDMASATditLRRVLVGHRAAVNVVDF--DDKYIVSASGDRTIKVWSTS 359
Cdd:COG2319   326 LTGHTGAVRSVAFSpdGKTLASGSDDGTVRLWDLATGE---LLRTLTGHTGAVTSVAFspDGRTLASGSADGTVRLWDLA 402

                  .
gi 1958658235 360 T 360
Cdd:COG2319   403 T 403

F-box domain found in F-box/WD repeat-containing proteins, FBXW1A, FBXW1B and similar proteins; FBXW1A, also called E3RSIkappaB, epididymis tissue protein Li 2a, F-box and WD repeats protein beta-TrCP, or pIkappaBalpha-E3 receptor subunit, is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins, such as CTNNB1, NFKBIA, NFKBIB and NFKBIE, as well as phosphorylated NFKB1, ATF4, CDC25A, DLG1, FBXO5, PER1, SMAD3, SMAD4, SNAI1 and probably NFKB2. FBXW1B, also called F-box/WD repeat-containing protein 11 (FBXW11), F-box and WD repeats protein beta-TrCP2, or homologous to Slimb protein (HOS), is the substrate-recognition component of an SCF E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins, such as IFNAR1, CEP68 and CDC25A, as well as phosphorylated CTNNB1, NFKBIA, PER1 and PER2. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 1958658235  84 QRDFITALPEQGLDHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKK 134
Cdd:cd22130     1 QRDFISALPAKGLDHIAENILSYLDAKSLCAAELVCKEWYRVIADGMLWKK 51

D domain of beta-TrCP; This domain is found in eukaryotes, and is approximately 40 amino acids in length. It is found associated with pfam00646, pfam00400. The protein that contains this domain functions as a ubiquitin ligase. Ubiquitination is required to direct proteins towards the proteasome for degradation. This protein is part of the WD40 class of F box proteins. The D domain of these F box proteins is involved in mediating the dimerization of the protein. dimerization is necessary to polyubiquitinate substrates so this D domain is vital in directing substrates towards the proteasome for degradation.

                          10        20        30
                  ....*....|....*....|....*....|....*....
gi 1958658235  46 KYFDQWSESDQVEFVEHLISRMCHYQHGHINSYLKPMLQ 84
Cdd:pfam12125   1 KYFDKWNESDQVDFVEHLLSRMCHYQHGHINSYLKPMLQ 39

WD40 repeat [General function prediction only];

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 199 QRIQCRSENSKGVYCLQY--DDDKIISGLRDNSIKIWDKSSLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWD 274
Cdd:COG2319   321 KLLRTLTGHTGAVRSVAFspDGKTLASGSDDGTVRLWDLATGELLRTLTGHTGAVTSVAFspDGRTLASGSADGTVRLWD 400

                  ...
gi 1958658235 275 VNT 277
Cdd:COG2319   401 LAT 403

F-box domain found in Schizosaccharomyces pombe Skp1-binding protein 1 (SpPof1) and similar proteins; SpPof1, also called F-box/WD repeat-containing protein pof1, probably recognizes and binds to some phosphorylated proteins and promotes their ubiquitination and degradation. It is required for the inactivation of zip1 via ubiquitination. This subfamily also includes Saccharomyces cerevisiae methionine-requiring protein 30 (ScMET30, also called E3 ubiquitin ligase complex SCF(Met30) subunit MET30), Aspergillus niger sulfur controller B (AnSCONB, also called sulfur metabolite repression control protein B) and Neurospora crassa sulfur controller 2 (NcSCON2, also called sulfur metabolite repression control protein 2). ScMET30 acts as a transcriptional inhibitor that negatively regulates the expression of sulfur amino acid biosynthesis genes. It controls cell cycle function (being required for the G1/S transition and M-phase but not the S-phase), sulfur metabolism, and methionine biosynthesis as part of the E3 ubiquitin ligase complex SCF(Met30). AnSCONB and NcSCON2 are components of the SCF (sconB/scon-2) E3 ubiquitin ligase complexes involved in the regulation of sulfur metabolite repression, probably by mediating the inactivation or degradation of the metR transcription factor. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 1958658235  87 FITALPEQgldhIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKKLI 136
Cdd:cd22147     1 FLSALPVE----LSLKILSYLDAKSLCRAAQVSKKWRNLADDDELWKRMC 46

WD40 repeats; Note that these repeats are permuted with respect to the structural repeats (blades) of the beta propeller domain.

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958658235  237 SLECLKVLTGHTGSVLCLQY--DERVIVTGSSDSTVRVWD 274
Cdd:smart00320   1 SGELLKTLKGHTGPVTSVAFspDGKYLASGSDDGTIKLWD 40

F-box domain found in F-box/WD repeat-containing protein 7 (FBXW7) and similar proteins; FBXW7, also called Archipelago homolog (Ago), F-box and WD-40 domain-containing protein 7, F-box protein FBX30, SEL-10, or Cdc4, is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins, such as cyclin-E (CCNE1 or CCNE2), DISC1, JUN, MYC, NOTCH1 released notch intracellular domain (NICD), NOTCH2, MCL1, and probably PSEN1. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235  74 HINSYLKPMLQRDFITALPEQgldhIAENILSYLDARSLCAAELVCKEWQRVISEGMLWK 133
Cdd:cd22133     4 HMMQVIEPQFQRDFISLLPKE----LALYVLSFLEPKDLLQAAQTCRYWRILAEDNLLWR 59

A Receptor for Ubiquitination Targets;

                           10        20        30
                   ....*....|....*....|....*....|....*....
gi 1958658235   97 DHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:smart00256   3 DEILEEILSKLDPKDLLRLRKVSRKWRSLIDSHDFWFKL 41

protein SPA1-RELATED; Provisional

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 250 SVLCLQ-YDERVIVTGSSDSTVRVWDVNTGEVLNTLIHHNEAVLHLRFSNG---LMVTCSKDRSIAVWDMASATDITLrr 325
Cdd:PLN00181  536 SGICWNsYIKSQVASSNFEGVVQVWDVARSQLVTEMKEHEKRVWSIDYSSAdptLLASGSDDGSVKLWSINQGVSIGT-- 613

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 326 vlVGHRAAVNVVDFDD---KYIVSASGDRTIKVWSTSTCEF-VRTLNGHKRGIACLQYRDR-LVVSGSSDNTIRLWDIEC 400
Cdd:PLN00181  614 --IKTKANICCVQFPSesgRSLAFGSADHKVYYYDLRNPKLpLCTMIGHSKTVSYVRFVDSsTLVSSSTDNTLKLWDLSM 691

                  ..
gi 1958658235 401 GA 402
Cdd:PLN00181  692 SI 693

F-box domain found in F-box/WD repeat-containing protein 5 (FBXW5) and similar proteins; FBXW5, also called F-box and WD-40 domain-containing protein 5, is the substrate-recognition component of both SCF (SKP1-CUL1-F-box protein) and DCX (DDB1-CUL4-X-box) E3 ubiquitin-protein ligase complexes. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30
                  ....*....|....*....|....*....|....
gi 1958658235 102 NILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:cd22132    11 HIFSYLSPKDLLAAGQVCKQWYRVSRDEFLWKEL 44

F-box domain superfamily; This short domain is commonly found at the N-terminus of various proteins, and typically co-occurs with one or more other conserved domains or motifs, such as leucine rich repeats, WD40 repeats, kelch, tub, spry, and others. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression. One of the best researched roles of F-box proteins is their participation in SCF (Skp1-Cul1-F-box protein), a multi-protein complex that functions as a ubiquitin E3 ligase, where the role of the F-box protein is to recruit target substrates. Gene families containing the F-box are found greatly expanded in narrow taxonomic lineages, such as flowering plants and nematodes. In this hierarchical classification, many of the subfamilies are named according to their domain architectures.

                          10        20        30
                  ....*....|....*....|....*....|.
gi 1958658235  97 DHIAENILSYLDARSLCAAELVCKEWQRVIS 127
Cdd:cd09917     5 DEILLKILSYLDPRDLLRLSLVCKRWRELAS 35

coronin; Provisional

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 296 FSNGLMVTCSKDRSIAVWDMAS---ATDITLRRV-LVGHRAAVNVVDFD---DKYIVSASGDRTIKVWSTSTCEFVRTLN 368
Cdd:PTZ00421   86 FDPQKLFTASEDGTIMGWGIPEeglTQNISDPIVhLQGHTKKVGIVSFHpsaMNVLASAGADMVVNVWDVERGKAVEVIK 165

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235 369 GHKRGIACLQY--RDRLVVSGSSDNTIRLWDIECGACLRVLEGHE--ELVRCIRFDNKRIV-----SGAYDGKIKVWDLQ 439
Cdd:PTZ00421  166 CHSDQITSLEWnlDGSLLCTTSKDKKLNIIDPRDGTIVSSVEAHAsaKSQRCLWAKRKDLIitlgcSKSQQRQIMLWDTR 245

                         170       180       190
                  ....*....|....*....|....*....|.
gi 1958658235 440 aalDPRAPASTlclrTLVEHSGRVFRLQFDE 470
Cdd:PTZ00421  246 ---KMASPYST----VDLDQSSALFIPFFDE 269

WD domain, G-beta repeat;

                          10        20        30
                  ....*....|....*....|....*....|....*...
gi 1958658235 362 EFVRTLNGHKRGIACLQY--RDRLVVSGSSDNTIRLWD 397
Cdd:pfam00400   2 KLLKTLEGHTGSVTSLAFspDGKLLASGSDDGTVKVWD 39

F-box domain found in F-box only protein 41 (FBXO41) and similar proteins; FBXO41, also called FBX41, is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein)-type E3 ubiquitin ligase complex. It acts as a novel central nervous system (CNS)-specific F-box protein that localizes to the centrosome and the cytoplasm of neurons and promotes neuronal migration. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30
                  ....*....|....*....|....*....|...
gi 1958658235 103 ILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:cd22109    14 VFSYLDTKSLLRCAEVCREWRDVSRHPALWQRV 46

F-box domain found in F-box only protein 11 (FBXO11) and similar proteins; FBXO11, also called FBX11, protein arginine N-methyltransferase 9 (PRMT9), or vitiligo-associated protein 1 (VIT-1), is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins, such as DTL/CDT2, BCL6 and PRDM1/BLIMP1. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30
                  ....*....|....*....|....*....|....*....
gi 1958658235  97 DHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:cd22091     6 DEVLLKIFSYLLEQDLCRAAQVCKRFNTLANDPELWKRL 44

WD40 repeats; Note that these repeats are permuted with respect to the structural repeats (blades) of the beta propeller domain.

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|
gi 1958658235  277 TGEVLNTLIHHNEAVLHLRFS--NGLMVTCSKDRSIAVWD 314
Cdd:smart00320   1 SGELLKTLKGHTGPVTSVAFSpdGKYLASGSDDGTIKLWD 40

F-box domain found in epithelial cell-transforming sequence 2 oncogene-like (ECT2L) and similar proteins; ECT2L, also called lung-specific F-box and DH domain-containing protein, or putative guanine nucleotide exchange factor LFDH, may act as a guanine nucleotide exchange factor (GEF). The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1958658235  86 DFITALPEqgldHIAENILSYLDARSLCAAELVCkeWQrvisegmlWKKLIERmvrtDPLWKGLSERRGW 155
Cdd:cd22173     1 DFTTVLPR----FLSLYIFSFLDPRSLCRAAQVS--WH--------WKFLAEQ----DCLWMPKCVKFGW 52

F-box domain found in F-box only protein 16 (FBXO16), epithelial cell-transforming sequence 2 oncogene-like (ECT2L) and similar proteins; This family includes FBXO16 and ECT2L. FBXO16, also called FBX16, is part of an SCF (SKP1-cullin-F-box) protein ligase complex. It probably recognizes and binds to some phosphorylated proteins and promotes their ubiquitination and degradation. It functions as a tumor suppressor by attenuating nuclear beta-catenin function. ECT2L, also called lung-specific F-box and DH domain-containing protein, or putative guanine nucleotide exchange factor LFDH, may act as a guanine nucleotide exchange factor (GEF). The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 1958658235  86 DFITALPEQgldhIAENILSYLDARSLCAAELVCKEWQRVISEGMLWK 133
Cdd:cd22094     1 DFTRVLPRF----LSLYIFSYLDPRSLCRAAQVSWYWKFLCESDELWL 44

F-box domain found in F-box/LRR-repeat protein 4 (FBXL4) and similar proteins; FBXL4, also called F-box and leucine-rich repeat protein 4, or F-box protein FBL4/FBL5, is part of an SCF (SKP1-cullin-F-box) protein ligase complex. It serves as a clock output molecule that regulates sleep through promotion of rhythmic degradation of the GABA(A) receptor. Biallelic pathogenic variants in FBXL4 are associated with an encephalopathic mtDNA maintenance defect syndrome that is a multi-system disease characterized by lactic acidemia, developmental delay, and hypotonia. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30
                  ....*....|....*....|....*....|...
gi 1958658235 103 ILSYLDARSLCAAELVCKEWQRVISEGMLWKKL 135
Cdd:cd22117    12 ILSYLDLPSLCRLSQTCKLFRKHCYDPLLWKEL 44

F-box domain; This domain is approximately 50 amino acids long, and is usually found in the N-terminal half of a variety of proteins. Two motifs that are commonly found associated with the F-box domain are the leucine rich repeats (LRRs; pfam00560 and pfam07723) and the WD repeat (pfam00400). The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30
                  ....*....|....*....|....*....|....*...
gi 1958658235  97 DHIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKK 134
Cdd:pfam00646   6 DDLLLEILSRLDPKDLLRLSLVSKRWRSLVDSLKLWKK 43

F-box domain found in Saccharomyces cerevisiae cell division control protein 4 (ScCDC4) and similar proteins; ScCDC4 is the substrate-recognition component of an SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. It is essential for initiation of DNA replication and separation of the spindle pole bodies to form the poles of the mitotic spindle. It also plays a role in bud development, fusion of zygotic nuclei after conjugation and various aspects of sporulation. The F-box domain has a role in mediating protein-protein interactions in a variety of contexts, such as polyubiquitination, transcription elongation, centromere binding and translational repression.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 1958658235  88 ITALPEQgldhIAENILSYLDARSLCAAELVCKEWQRVISEGMLWKKLI 136
Cdd:cd22141     1 IGNLPFE----ISLKIFNYLQFEDLLNSLGVSKKWNKIIRNTALWKKLL 45