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UniProtKB - Q9QXL2 (KI21A_MOUSE)
Protein
Kinesin-like protein KIF21A
Gene
Kif21a
Organism
Mus musculus (Mouse)
Status
Functioni
Microtubule-binding motor protein probably involved in neuronal axonal transport. In vitro, has a plus-end directed motor activity.
1 PublicationRegions
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Nucleotide bindingi | 88 – 95 | ATPPROSITE-ProRule annotation | 8 |
GO - Molecular functioni
- ankyrin repeat binding Source: UniProtKB
- ATP binding Source: UniProtKB-KW
- ATP hydrolysis activity Source: GO_Central
- microtubule binding Source: GO_Central
- microtubule motor activity Source: GO_Central
GO - Biological processi
- microtubule-based movement Source: GO_Central
Keywordsi
Molecular function | Motor protein |
Ligand | ATP-binding, Nucleotide-binding |
Enzyme and pathway databases
Reactomei | R-MMU-6811434, COPI-dependent Golgi-to-ER retrograde traffic R-MMU-983189, Kinesins |
Names & Taxonomyi
Protein namesi | Recommended name: Kinesin-like protein KIF21A |
Gene namesi | Name:Kif21a Synonyms:Kiaa1708 |
Organismi | Mus musculus (Mouse) |
Taxonomic identifieri | 10090 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Glires › Rodentia › Myomorpha › Muroidea › Muridae › Murinae › Mus › Mus |
Proteomesi |
|
Organism-specific databases
MGIi | MGI:109188, Kif21a |
VEuPathDBi | HostDB:ENSMUSG00000022629 |
Subcellular locationi
Cytoskeleton
- cytoskeleton 1 Publication
Other locations
Note: In neurons, localized to axons and dendrites.1 Publication
Cytoskeleton
- kinesin complex Source: GO_Central
- microtubule Source: GO_Central
Cytosol
- cytosol Source: MGI
Plasma Membrane
- plasma membrane Source: MGI
Other locations
Keywords - Cellular componenti
Cell projection, Cytoplasm, Cytoskeleton, MicrotubulePTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
ChainiPRO_0000125463 | 1 – 1672 | Kinesin-like protein KIF21AAdd BLAST | 1672 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length | |
---|---|---|---|---|---|
Modified residuei | 1 | N-acetylmethionineBy similarity | 1 | ||
Modified residuei | 258 | PhosphoserineCombined sources | 1 | ||
Modified residuei | 524 | PhosphoserineBy similarity | 1 | ||
Modified residuei | 1227 | PhosphoserineBy similarity | 1 | ||
Modified residuei | 1231 | PhosphoserineBy similarity | 1 | ||
Modified residuei | 1241 | PhosphoserineBy similarity | 1 | ||
Modified residuei | 1660 | PhosphoserineCombined sources | 1 | ||
Modified residuei | 1662 | PhosphothreonineBy similarity | 1 | ||
Modified residuei | 1671 | PhosphoserineCombined sources | 1 | ||
Isoform 2 (identifier: Q9QXL2-2) | |||||
Modified residuei | 1101 | PhosphoserineCombined sources | 1 | ||
Modified residuei | 1102 | PhosphoserineCombined sources | 1 | ||
Modified residuei | 1207 | PhosphoserineCombined sources | 1 |
Keywords - PTMi
Acetylation, PhosphoproteinProteomic databases
MaxQBi | Q9QXL2 |
PaxDbi | Q9QXL2 |
PeptideAtlasi | Q9QXL2 |
PRIDEi | Q9QXL2 |
ProteomicsDBi | 264749 [Q9QXL2-1] 264750 [Q9QXL2-2] 264751 [Q9QXL2-3] 264752 [Q9QXL2-4] |
PTM databases
iPTMneti | Q9QXL2 |
PhosphoSitePlusi | Q9QXL2 |
Expressioni
Tissue specificityi
Widely expressed, with highest expression in brain.1 Publication
Gene expression databases
Bgeei | ENSMUSG00000022629, Expressed in dorsal root ganglion and 289 other tissues |
ExpressionAtlasi | Q9QXL2, baseline and differential |
Genevisiblei | Q9QXL2, MM |
Interactioni
Subunit structurei
Interacts (via residues 1148-1169) with KANK1 (via ankyrin repeats 1-5) and KANK2 (via ankyrin repeats 1-5).
By similarityGO - Molecular functioni
- ankyrin repeat binding Source: UniProtKB
- microtubule binding Source: GO_Central
Protein-protein interaction databases
BioGRIDi | 200939, 7 interactors |
IntActi | Q9QXL2, 7 interactors |
MINTi | Q9QXL2 |
STRINGi | 10090.ENSMUSP00000085985 |
Miscellaneous databases
RNActi | Q9QXL2, protein |
Structurei
Secondary structure
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details3D structure databases
AlphaFoldDBi | Q9QXL2 |
SMRi | Q9QXL2 |
ModBasei | Search... |
PDBe-KBi | Search... |
Family & Domainsi
Domains and Repeats
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Domaini | 9 – 371 | Kinesin motorPROSITE-ProRule annotationAdd BLAST | 363 | |
Repeati | 1343 – 1380 | WD 1Add BLAST | 38 | |
Repeati | 1383 – 1421 | WD 2Add BLAST | 39 | |
Repeati | 1447 – 1485 | WD 3Add BLAST | 39 | |
Repeati | 1488 – 1530 | WD 4Add BLAST | 43 | |
Repeati | 1539 – 1576 | WD 5Add BLAST | 38 | |
Repeati | 1580 – 1619 | WD 6Add BLAST | 40 | |
Repeati | 1622 – 1659 | WD 7Add BLAST | 38 |
Region
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Regioni | 556 – 646 | DisorderedSequence analysisAdd BLAST | 91 | |
Regioni | 780 – 808 | DisorderedSequence analysisAdd BLAST | 29 | |
Regioni | 836 – 886 | DisorderedSequence analysisAdd BLAST | 51 | |
Regioni | 1109 – 1139 | DisorderedSequence analysisAdd BLAST | 31 | |
Regioni | 1148 – 1169 | Interaction with KANK1 and KANK2By similarityAdd BLAST | 22 | |
Regioni | 1172 – 1315 | DisorderedSequence analysisAdd BLAST | 144 |
Coiled coil
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Coiled coili | 365 – 840 | Sequence analysisAdd BLAST | 476 | |
Coiled coili | 933 – 1021 | Sequence analysisAdd BLAST | 89 | |
Coiled coili | 1055 – 1085 | Sequence analysisAdd BLAST | 31 |
Compositional bias
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Compositional biasi | 558 – 603 | Basic and acidic residuesSequence analysisAdd BLAST | 46 | |
Compositional biasi | 604 – 637 | Acidic residuesSequence analysisAdd BLAST | 34 | |
Compositional biasi | 850 – 882 | Polar residuesSequence analysisAdd BLAST | 33 | |
Compositional biasi | 1222 – 1237 | Polar residuesSequence analysisAdd BLAST | 16 | |
Compositional biasi | 1239 – 1266 | Basic and acidic residuesSequence analysisAdd BLAST | 28 | |
Compositional biasi | 1282 – 1307 | Polar residuesSequence analysisAdd BLAST | 26 |
Sequence similaritiesi
Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family.PROSITE-ProRule annotation
Keywords - Domaini
Coiled coil, Repeat, WD repeatPhylogenomic databases
eggNOGi | KOG0244, Eukaryota |
GeneTreei | ENSGT00940000155323 |
HOGENOMi | CLU_001485_4_5_1 |
InParanoidi | Q9QXL2 |
OrthoDBi | 390391at2759 |
PhylomeDBi | Q9QXL2 |
TreeFami | TF105224 |
Family and domain databases
Gene3Di | 2.130.10.10, 2 hits 3.40.850.10, 1 hit |
InterProi | View protein in InterPro IPR027640, Kinesin-like_fam IPR019821, Kinesin_motor_CS IPR001752, Kinesin_motor_dom IPR036961, Kinesin_motor_dom_sf IPR027417, P-loop_NTPase IPR015943, WD40/YVTN_repeat-like_dom_sf IPR001680, WD40_repeat IPR019775, WD40_repeat_CS IPR036322, WD40_repeat_dom_sf |
PANTHERi | PTHR24115, PTHR24115, 1 hit |
Pfami | View protein in Pfam PF00225, Kinesin, 1 hit PF00400, WD40, 3 hits |
PRINTSi | PR00380, KINESINHEAVY |
SMARTi | View protein in SMART SM00129, KISc, 1 hit SM00320, WD40, 7 hits |
SUPFAMi | SSF50978, SSF50978, 1 hit SSF52540, SSF52540, 1 hit |
PROSITEi | View protein in PROSITE PS00411, KINESIN_MOTOR_1, 1 hit PS50067, KINESIN_MOTOR_2, 1 hit PS00678, WD_REPEATS_1, 1 hit PS50082, WD_REPEATS_2, 2 hits PS50294, WD_REPEATS_REGION, 1 hit |
s (4+)i Sequence
Sequence statusi: Complete.
This entry describes 4 produced by isoformsialternative splicing. AlignAdd to basketThis entry has 4 described isoforms and 4 potential isoforms that are computationally mapped.Show allAlign All
Isoform 1 (identifier: Q9QXL2-1) [UniParc]FASTAAdd to basket
This isoform has been chosen as the sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. canonicali
10 20 30 40 50
MLGAADESSV RVAVRIRPQL AKEKIEGCHI CTSVTPGEPQ VFLGKDKAFT
60 70 80 90 100
FDYVFDIDSQ QEQIYTQCIE KLIEGCFEGY NATVFAYGQT GAGKTYTMGT
110 120 130 140 150
GFDVNIMEEE QGIISRAVRH LFKSIDEKKT SAIKNGLPPP EFKVNAQFLE
160 170 180 190 200
LYNEEVLDLF DTTRDIDAKN KKSNIRIHED STGGIYTVGV TTRTVNTEPE
210 220 230 240 250
MMQCLKLGAL SRTTASTQMN VQSSRSHAIF TIHVCQTRVC PQTDAENATD
260 270 280 290 300
NKLISESSPM NEFETLTAKF HFVDLAGSER LKRTGATGER AKEGISINCG
310 320 330 340 350
LLALGNVISA LGDKSKRATH VPYRDSKLTR LLQDSLGGNS QTIMIACVSP
360 370 380 390 400
SDRDFMETLN TLKYANRARN IKNKVMVNQD RASQQINALR SEITRLQMEL
410 420 430 440 450
MEYKTGKRII DEEGVESIND MFHENAMLQT ENNNLRVRIK AMQETVDALR
460 470 480 490 500
ARITQLVSEQ ANQVLARAGE GNEEISNMIH SYIKEIEDLR AKLLESEAVN
510 520 530 540 550
ENLRKNLTRA TARSPYFSAS SAFSPTILSS DKETIEIIDL AKKDLEKLKR
560 570 580 590 600
KEKKKKKRLQ KLEESGREER SVAGKDDNAD TDQEKKEEKG VSEKENNELD
610 620 630 640 650
VEENQEVSDH EDEEEEEEDE EEEDDIEGEE SSDESDSESD EKANYQADLA
660 670 680 690 700
NITCEIAIKQ KLIDELENSQ KRLQTLKKQY EEKLMMLQHK IRDTQLERDQ
710 720 730 740 750
VLQNLGSVES YSEEKAKKVK CEYEKKLHAM NKELQRLQTA QKEHARLLKN
760 770 780 790 800
QSQYEKQLKK LQQDVMEMKK TKVRLMKQMK EEQEKARLTE SRRNREIAQL
810 820 830 840 850
KKDQRKRDHQ LRLLEAQKRN QEVVLRRKTE EVTALRRQVR PMSDKVAGKV
860 870 880 890 900
TRKLSSSESP APDTGSSAAS GEADTSRPGT QQKMRIPVAR VQALPTPTTN
910 920 930 940 950
GTRKKYQRKG FTGRVFTSKT ARMKWQLLER RVTDIIMQKM TISNMEADMN
960 970 980 990 1000
RLLRQREELT KRREKLSKRR EKIVKESGEG DKSVANIIEE MESLTANIDY
1010 1020 1030 1040 1050
INDSIADCQA NIMQMEEAKE EGETLDVTAV INACTLTEAR YLLDHFLSMG
1060 1070 1080 1090 1100
INKGLQAAQK EAQIKVLEGR LKQTEITSAT QNQLLFHMLK EKAELNPELD
1110 1120 1130 1140 1150
ALLGHALQDL DGAPPENEED SSEEDGPLHS PGSEGSTLSS DLMKLCGEVK
1160 1170 1180 1190 1200
PKNKARRRTT TQMELLYADS SEVASDTSAG DASLSGPLAP VAEGQEIGMN
1210 1220 1230 1240 1250
TETSGTSARD KELLAPSGLP SKIGSISRQS SLSEKKVPEP SPVTRRKAYE
1260 1270 1280 1290 1300
KADKPKAKEH KHSDSGASET SLSPPSSPPS RPRNELNVFN RLTVPQGTPS
1310 1320 1330 1340 1350
VQQDKSDESD SSLSEVHRGI INPFPACKGV RASPLQCVHI AEGHTKAVLC
1360 1370 1380 1390 1400
VDSTDDLLFT GSKDRTCKVW NLVTGQEIMS LGVHPNNVVS VKYCNYTSLV
1410 1420 1430 1440 1450
FTVSTSYIKV WDIRESAKCI RTLTSSGQVT LGEACSASTS RTVAIPSGES
1460 1470 1480 1490 1500
QINQIALNPT GTFLYAASGN AVRMWDLKRF QSTGKLTGHL GPVMCLTVDQ
1510 1520 1530 1540 1550
ISNGQDLIIT GSKDHYIKMF DVTEGALGTV SPTHNFEPPH YDGIEALAIQ
1560 1570 1580 1590 1600
GDNLFSGSRD NGIKKWDLAQ KGLLQQVPNA HKDWVCALGL VPGHPVLLSG
1610 1620 1630 1640 1650
CRGGILKLWN VDTFVPVGEM RGHDSPINAI CVNSTHVFTA ADDRTVRIWK
1660 1670
AHNLQDGQLS DTGDLGEDIA SN
Computationally mapped potential isoform sequencesi
There are 4 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basketE9Q0J5 | E9Q0J5_MOUSE | Kinesin-like protein KIF21A | Kif21a | 1,672 | Annotation score: | ||
F8WGN6 | F8WGN6_MOUSE | Kinesin-like protein KIF21A | Kif21a | 1,628 | Annotation score: | ||
A0A2R8VKM5 | A0A2R8VKM5_MOUSE | Kinesin-like protein KIF21A | Kif21a | 250 | Annotation score: | ||
A0A2R8VJN0 | A0A2R8VJN0_MOUSE | Kinesin-like protein KIF21A | Kif21a | 221 | Annotation score: |
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Sequence conflicti | 1127 | P → A in AAF17083 (PubMed:10225949).Curated | 1 | |
Sequence conflicti | 1311 | S → F (PubMed:10225949).Curated | 1 | |
Sequence conflicti | 1321 | I → L (PubMed:10225949).Curated | 1 |
Alternative sequence
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Alternative sequenceiVSP_010873 | 558 – 570 | Missing in isoform 2 and isoform 3. 2 PublicationsAdd BLAST | 13 | |
Alternative sequenceiVSP_010874 | 1109 – 1115 | Missing in isoform 2. 1 Publication | 7 | |
Alternative sequenceiVSP_010875 | 1226 – 1305 | ISRQS…VQQDK → M in isoform 2. 1 PublicationAdd BLAST | 80 | |
Alternative sequenceiVSP_010876 | 1227 – 1318 | Missing in isoform 3. 1 PublicationAdd BLAST | 92 | |
Alternative sequenceiVSP_010877 | 1262 – 1318 | HSDSG…SEVHR → Q in isoform 4. 1 PublicationAdd BLAST | 57 |
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AF202892 mRNA Translation: AAF17083.1 BC060698 mRNA Translation: AAH60698.1 BC062896 mRNA Translation: AAH62896.1 AK129426 mRNA Translation: BAC98236.1 AK049303 mRNA Translation: BAC33669.1 AK047350 mRNA Translation: BAC33031.1 |
CCDSi | CCDS37179.1 [Q9QXL2-2] CCDS49706.1 [Q9QXL2-3] CCDS49708.1 [Q9QXL2-1] |
RefSeqi | NP_001102510.1, NM_001109040.2 [Q9QXL2-1] NP_001102511.1, NM_001109041.2 NP_001102512.1, NM_001109042.2 [Q9QXL2-3] NP_057914.2, NM_016705.4 [Q9QXL2-2] |
Genome annotation databases
Ensembli | ENSMUST00000088614; ENSMUSP00000085985; ENSMUSG00000022629 [Q9QXL2-1] ENSMUST00000109287; ENSMUSP00000104910; ENSMUSG00000022629 [Q9QXL2-3] ENSMUST00000109288; ENSMUSP00000104911; ENSMUSG00000022629 [Q9QXL2-2] |
GeneIDi | 16564 |
KEGGi | mmu:16564 |
UCSCi | uc007xhs.3, mouse [Q9QXL2-1] uc007xht.3, mouse [Q9QXL2-2] uc007xhv.3, mouse [Q9QXL2-3] |
Keywords - Coding sequence diversityi
Alternative splicingSimilar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | AF202892 mRNA Translation: AAF17083.1 BC060698 mRNA Translation: AAH60698.1 BC062896 mRNA Translation: AAH62896.1 AK129426 mRNA Translation: BAC98236.1 AK049303 mRNA Translation: BAC33669.1 AK047350 mRNA Translation: BAC33031.1 |
CCDSi | CCDS37179.1 [Q9QXL2-2] CCDS49706.1 [Q9QXL2-3] CCDS49708.1 [Q9QXL2-1] |
RefSeqi | NP_001102510.1, NM_001109040.2 [Q9QXL2-1] NP_001102511.1, NM_001109041.2 NP_001102512.1, NM_001109042.2 [Q9QXL2-3] NP_057914.2, NM_016705.4 [Q9QXL2-2] |
3D structure databases
Select the link destinations: PDBei RCSB PDBi PDBji Links Updated | PDB entry | Method | Resolution (Å) | Chain | Positions | PDBsum |
5YAY | X-ray | 1.55 | B | 1142-1169 | [»] | |
5YBE | X-ray | 2.11 | B | 1151-1169 | [»] | |
AlphaFoldDBi | Q9QXL2 | |||||
SMRi | Q9QXL2 | |||||
ModBasei | Search... | |||||
PDBe-KBi | Search... |
Protein-protein interaction databases
BioGRIDi | 200939, 7 interactors |
IntActi | Q9QXL2, 7 interactors |
MINTi | Q9QXL2 |
STRINGi | 10090.ENSMUSP00000085985 |
PTM databases
iPTMneti | Q9QXL2 |
PhosphoSitePlusi | Q9QXL2 |
Proteomic databases
MaxQBi | Q9QXL2 |
PaxDbi | Q9QXL2 |
PeptideAtlasi | Q9QXL2 |
PRIDEi | Q9QXL2 |
ProteomicsDBi | 264749 [Q9QXL2-1] 264750 [Q9QXL2-2] 264751 [Q9QXL2-3] 264752 [Q9QXL2-4] |
Protocols and materials databases
Antibodypediai | 13055, 57 antibodies from 21 providers |
DNASUi | 16564 |
Genome annotation databases
Ensembli | ENSMUST00000088614; ENSMUSP00000085985; ENSMUSG00000022629 [Q9QXL2-1] ENSMUST00000109287; ENSMUSP00000104910; ENSMUSG00000022629 [Q9QXL2-3] ENSMUST00000109288; ENSMUSP00000104911; ENSMUSG00000022629 [Q9QXL2-2] |
GeneIDi | 16564 |
KEGGi | mmu:16564 |
UCSCi | uc007xhs.3, mouse [Q9QXL2-1] uc007xht.3, mouse [Q9QXL2-2] uc007xhv.3, mouse [Q9QXL2-3] |
Organism-specific databases
CTDi | 55605 |
MGIi | MGI:109188, Kif21a |
VEuPathDBi | HostDB:ENSMUSG00000022629 |
Rougei | Search... |
Phylogenomic databases
eggNOGi | KOG0244, Eukaryota |
GeneTreei | ENSGT00940000155323 |
HOGENOMi | CLU_001485_4_5_1 |
InParanoidi | Q9QXL2 |
OrthoDBi | 390391at2759 |
PhylomeDBi | Q9QXL2 |
TreeFami | TF105224 |
Enzyme and pathway databases
Reactomei | R-MMU-6811434, COPI-dependent Golgi-to-ER retrograde traffic R-MMU-983189, Kinesins |
Miscellaneous databases
BioGRID-ORCSi | 16564, 2 hits in 72 CRISPR screens |
ChiTaRSi | Kif21a, mouse |
PROi | PR:Q9QXL2 |
RNActi | Q9QXL2, protein |
SOURCEi | Search... |
Gene expression databases
Bgeei | ENSMUSG00000022629, Expressed in dorsal root ganglion and 289 other tissues |
ExpressionAtlasi | Q9QXL2, baseline and differential |
Genevisiblei | Q9QXL2, MM |
Family and domain databases
Gene3Di | 2.130.10.10, 2 hits 3.40.850.10, 1 hit |
InterProi | View protein in InterPro IPR027640, Kinesin-like_fam IPR019821, Kinesin_motor_CS IPR001752, Kinesin_motor_dom IPR036961, Kinesin_motor_dom_sf IPR027417, P-loop_NTPase IPR015943, WD40/YVTN_repeat-like_dom_sf IPR001680, WD40_repeat IPR019775, WD40_repeat_CS IPR036322, WD40_repeat_dom_sf |
PANTHERi | PTHR24115, PTHR24115, 1 hit |
Pfami | View protein in Pfam PF00225, Kinesin, 1 hit PF00400, WD40, 3 hits |
PRINTSi | PR00380, KINESINHEAVY |
SMARTi | View protein in SMART SM00129, KISc, 1 hit SM00320, WD40, 7 hits |
SUPFAMi | SSF50978, SSF50978, 1 hit SSF52540, SSF52540, 1 hit |
PROSITEi | View protein in PROSITE PS00411, KINESIN_MOTOR_1, 1 hit PS50067, KINESIN_MOTOR_2, 1 hit PS00678, WD_REPEATS_1, 1 hit PS50082, WD_REPEATS_2, 2 hits PS50294, WD_REPEATS_REGION, 1 hit |
MobiDBi | Search... |
Entry informationi
Entry namei | KI21A_MOUSE | |
Accessioni | Q9QXL2Primary (citable) accession number: Q9QXL2 Secondary accession number(s): Q6P5H1 Q8BXF1 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | July 19, 2004 |
Last sequence update: | July 19, 2004 | |
Last modified: | May 25, 2022 | |
This is version 170 of the entry and version 2 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Chordata Protein Annotation Program |
Miscellaneousi
Keywords - Technical termi
3D-structure, Reference proteomeDocuments
- MGD cross-references
Mouse Genome Database (MGD) cross-references in UniProtKB/Swiss-Prot - PDB cross-references
Index of Protein Data Bank (PDB) cross-references - SIMILARITY comments
Index of protein domains and families