UniProtKB - Q8NAC3 (I17RC_HUMAN)
Interleukin-17 receptor C
IL17RC
Functioni
GO - Molecular functioni
- interleukin-17 receptor activity Source: MGI
- signaling receptor binding Source: Ensembl
GO - Biological processi
- defense response to fungus Source: Ensembl
- granulocyte chemotaxis Source: Ensembl
- inflammatory response Source: UniProtKB-KW
- interleukin-17-mediated signaling pathway Source: Reactome
- positive regulation of cytokine production involved in inflammatory response Source: Ensembl
- positive regulation of interleukin-6 production Source: Ensembl
Keywordsi
Molecular function | Receptor |
Biological process | Inflammatory response |
Enzyme and pathway databases
PathwayCommonsi | Q8NAC3 |
Reactomei | R-HSA-448424, Interleukin-17 signaling |
SIGNORi | Q8NAC3 |
Names & Taxonomyi
Protein namesi | Recommended name: Interleukin-17 receptor CShort name: IL-17 receptor C Short name: IL-17RC Alternative name(s): Interleukin-17 receptor homolog Short name: IL17Rhom Interleukin-17 receptor-like protein Short name: IL-17RL ZcytoR14 |
Gene namesi | Name:IL17RC ORF Names:UNQ6118/PRO20040/PRO38901 |
Organismi | Homo sapiens (Human) |
Taxonomic identifieri | 9606 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo |
Proteomesi |
|
Organism-specific databases
HGNCi | HGNC:18358, IL17RC |
MIMi | 610925, gene |
neXtProti | NX_Q8NAC3 |
VEuPathDBi | HostDB:ENSG00000163702.18 |
Subcellular locationi
Plasma membrane
- Cell membrane 1 Publication; Single-pass type I membrane protein Sequence analysis
Note: Soluble isoforms may be produced.
Plasma Membrane
- plasma membrane Source: Reactome
Other locations
- cell surface Source: Ensembl
- integral component of membrane Source: UniProtKB-KW
Topology
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Topological domaini | 21 – 538 | ExtracellularSequence analysisAdd BLAST | 518 | |
Transmembranei | 539 – 559 | HelicalSequence analysisAdd BLAST | 21 | |
Topological domaini | 560 – 791 | CytoplasmicSequence analysisAdd BLAST | 232 |
Keywords - Cellular componenti
Cell membrane, MembranePathology & Biotechi
Involvement in diseasei
Candidiasis, familial, 9 (CANDF9)1 Publication
Organism-specific databases
DisGeNETi | 84818 |
MalaCardsi | IL17RC |
MIMi | 616445, phenotype |
OpenTargetsi | ENSG00000163702 |
Orphaneti | 1334, Chronic mucocutaneous candidiasis |
PharmGKBi | PA134986616 |
Miscellaneous databases
Pharosi | Q8NAC3, Tclin |
Chemistry databases
DrugCentrali | Q8NAC3 |
Genetic variation databases
BioMutai | IL17RC |
DMDMi | 229462881 |
PTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Signal peptidei | 1 – 20 | 1 PublicationAdd BLAST | 20 | |
ChainiPRO_0000011034 | 21 – 791 | Interleukin-17 receptor CAdd BLAST | 771 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Glycosylationi | 189 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Glycosylationi | 257 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Disulfide bondi | 265 ↔ 277 | Combined sources1 Publication | ||
Glycosylationi | 284 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Glycosylationi | 297 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Glycosylationi | 324 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Glycosylationi | 334 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Disulfide bondi | 341 ↔ 391 | Combined sources1 Publication | ||
Disulfide bondi | 343 ↔ 359 | Combined sources1 Publication | ||
Disulfide bondi | 400 ↔ 409 | Combined sources1 Publication | ||
Glycosylationi | 420 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Disulfide bondi | 439 ↔ 453 | Combined sources1 Publication | ||
Glycosylationi | 443 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Glycosylationi | 477 | N-linked (GlcNAc...) asparagineSequence analysis | 1 | |
Disulfide bondi | 481 ↔ 488 | Combined sources1 Publication | ||
Disulfide bondi | 515 ↔ 529 | Combined sources1 Publication |
Keywords - PTMi
Disulfide bond, GlycoproteinProteomic databases
jPOSTi | Q8NAC3 |
PaxDbi | Q8NAC3 |
PeptideAtlasi | Q8NAC3 |
PRIDEi | Q8NAC3 |
ProteomicsDBi | 20526 20554 72669 [Q8NAC3-1] 72670 [Q8NAC3-2] 72671 [Q8NAC3-3] 72672 [Q8NAC3-4] |
PTM databases
GlyGeni | Q8NAC3, 9 sites |
iPTMneti | Q8NAC3 |
PhosphoSitePlusi | Q8NAC3 |
Expressioni
Tissue specificityi
Inductioni
Gene expression databases
Bgeei | ENSG00000163702, Expressed in adenohypophysis and 207 other tissues |
ExpressionAtlasi | Q8NAC3, baseline and differential |
Genevisiblei | Q8NAC3, HS |
Organism-specific databases
HPAi | ENSG00000163702, Low tissue specificity |
Interactioni
Subunit structurei
Homodimer; disulfide-linked (PubMed:32187518). Heterodimer with IL17RA (PubMed:16785495, PubMed:18684971). Heterodimerization with IL17RA is independent of the cytoplasmic tail (By similarity). Associates with non-glycosylated IL17RA constitutively (By similarity). Binding of IL17A and IL17F induces association with glycosylated IL17RA (By similarity). Forms complexes with 2:1 binding stoichiometry: two receptor chains for one interleukin molecule (PubMed:32187518, PubMed:28827714). IL17A homodimer preferentially drives the formation of IL17RA-IL17RC heterodimeric receptor complex, whereas IL17F homodimer forms predominantly complexes with IL17RC homodimer (PubMed:32187518). IL17A-IL17F forms complexes with IL17RA-IL17RC, but with lower affinity when compared to IL17A homodimer (PubMed:32187518). IL17RC chain can not distinguish between IL17A and IL17F molecules, potentially enabling the formation of topologically distinct complexes (PubMed:28827714).
Interacts (through SEFIR domain and extended downstream region) with TRAF3IP2/ACT1 (phosphorylated) (PubMed:24120361).
By similarity5 PublicationsGO - Molecular functioni
- signaling receptor binding Source: Ensembl
Protein-protein interaction databases
BioGRIDi | 124278, 53 interactors |
IntActi | Q8NAC3, 45 interactors |
STRINGi | 9606.ENSP00000295981 |
Miscellaneous databases
RNActi | Q8NAC3, protein |
Structurei
Secondary structure
3D structure databases
SMRi | Q8NAC3 |
ModBasei | Search... |
PDBe-KBi | Search... |
Family & Domainsi
Domains and Repeats
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Domaini | 583 – 735 | SEFIRPROSITE-ProRule annotationAdd BLAST | 153 |
Keywords - Domaini
Signal, Transmembrane, Transmembrane helixPhylogenomic databases
eggNOGi | ENOG502RYE0, Eukaryota |
GeneTreei | ENSGT00730000111286 |
HOGENOMi | CLU_026893_1_0_1 |
InParanoidi | Q8NAC3 |
OMAi | CLWSDSL |
OrthoDBi | 297610at2759 |
PhylomeDBi | Q8NAC3 |
TreeFami | TF335852 |
Family and domain databases
InterProi | View protein in InterPro IPR039465, IL-17_rcpt-like IPR027841, IL-17_rcpt_C/E_N IPR013568, SEFIR_dom |
PANTHERi | PTHR15583, PTHR15583, 1 hit |
Pfami | View protein in Pfam PF15037, IL17_R_N, 1 hit PF08357, SEFIR, 1 hit |
PROSITEi | View protein in PROSITE PS51534, SEFIR, 1 hit |
s (8+)i Sequence
Sequence statusi: Complete.
: The displayed sequence is further processed into a mature form. Sequence processingi
This entry describes 8 produced by isoformsialternative splicing. AlignAdd to basketThis entry has 8 described isoforms and 11 potential isoforms that are computationally mapped.Show allAlign All
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
MPVPWFLLSL ALGRSPVVLS LERLVGPQDA THCSPVSLEP WGDEERLRVQ
60 70 80 90 100
FLAQQSLSLA PVTAATARTA LSGLSGADGR REERGRGKSW VCLSLGGSGN
110 120 130 140 150
TEPQKKGLSC RLWDSDILCL PGDIVPAPGP VLAPTHLQTE LVLRCQKETD
160 170 180 190 200
CDLCLRVAVH LAVHGHWEEP EDEEKFGGAA DSGVEEPRNA SLQAQVVLSF
210 220 230 240 250
QAYPTARCVL LEVQVPAALV QFGQSVGSVV YDCFEAALGS EVRIWSYTQP
260 270 280 290 300
RYEKELNHTQ QLPDCRGLEV WNSIPSCWAL PWLNVSADGD NVHLVLNVSE
310 320 330 340 350
EQHFGLSLYW NQVQGPPKPR WHKNLTGPQI ITLNHTDLVP CLCIQVWPLE
360 370 380 390 400
PDSVRTNICP FREDPRAHQN LWQAARLQLL TLQSWLLDAP CSLPAEAALC
410 420 430 440 450
WRAPGGDPCQ PLVPPLSWEN VTVDKVLEFP LLKGHPNLCV QVNSSEKLQL
460 470 480 490 500
QECLWADSLG PLKDDVLLLE TRGPQDNRSL CALEPSGCTS LPSKASTRAA
510 520 530 540 550
RLGEYLLQDL QSGQCLQLWD DDLGALWACP MDKYIHKRWA LVWLACLLFA
560 570 580 590 600
AALSLILLLK KDHAKGWLRL LKQDVRSGAA ARGRAALLLY SADDSGFERL
610 620 630 640 650
VGALASALCQ LPLRVAVDLW SRRELSAQGP VAWFHAQRRQ TLQEGGVVVL
660 670 680 690 700
LFSPGAVALC SEWLQDGVSG PGAHGPHDAF RASLSCVLPD FLQGRAPGSY
710 720 730 740 750
VGACFDRLLH PDAVPALFRT VPVFTLPSQL PDFLGALQQP RAPRSGRLQE
760 770 780 790
RAEQVSRALQ PALDSYFHPP GTPAPGRGVG PGAGPGAGDG T
Computationally mapped potential isoform sequencesi
There are 11 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basketC9JSZ3 | C9JSZ3_HUMAN | Interleukin-17 receptor C | IL17RC | 330 | Annotation score: | ||
B4DI24 | B4DI24_HUMAN | Interleukin-17 receptor C | IL17RC | 242 | Annotation score: | ||
C9K0M1 | C9K0M1_HUMAN | Interleukin-17 receptor C | IL17RC | 416 | Annotation score: | ||
F8WD65 | F8WD65_HUMAN | Interleukin-17 receptor C | IL17RC | 156 | Annotation score: | ||
F8WB43 | F8WB43_HUMAN | Interleukin-17 receptor C | IL17RC | 123 | Annotation score: | ||
F8WE27 | F8WE27_HUMAN | Interleukin-17 receptor C | IL17RC | 98 | Annotation score: | ||
F8WEG5 | F8WEG5_HUMAN | Interleukin-17 receptor C | IL17RC | 99 | Annotation score: | ||
A8K3Q5 | A8K3Q5_HUMAN | Interleukin-17 receptor C | IL17RC | 91 | Annotation score: | ||
G3V177 | G3V177_HUMAN | Interleukin 17 receptor C, isoform ... | IL17RC hCG_1995707 | 44 | Annotation score: | ||
F8WC09 | F8WC09_HUMAN | Interleukin-17 receptor C | IL17RC | 70 | Annotation score: | ||
There is more potential isoformShow all |
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Sequence conflicti | 241 | E → G in AAQ89199 (PubMed:12975309). | 1 | |
Sequence conflicti | 378 | Q → R in ABV44615 (PubMed:17911633).Curated | 1 | |
Sequence conflicti | 378 | Q → R in ABV44616 (PubMed:17911633).Curated | 1 | |
Sequence conflicti | 378 | Q → R in ABV44617 (PubMed:17911633).Curated | 1 | |
Sequence conflicti | 378 | Q → R in BD292072 (Ref. 2) Curated | 1 | |
Sequence conflicti | 378 | Q → R in AAM77569 (Ref. 3) Curated | 1 | |
Sequence conflicti | 378 | Q → R in AAQ89199 (PubMed:12975309).Curated | 1 | |
Sequence conflicti | 378 | Q → R in AAQ89456 (PubMed:12975309).Curated | 1 | |
Sequence conflicti | 378 | Q → R in BAC04001 (PubMed:14702039).Curated | 1 |
Natural variant
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Natural variantiVAR_022680 | 182 | S → L2 PublicationsCorresponds to variant dbSNP:rs708567Ensembl. | 1 |
Alternative sequence
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Alternative sequenceiVSP_014138 | 36 – 106 | Missing in isoform 2, isoform 3, isoform 4, isoform 5, isoform 6, isoform 7 and isoform 8. 3 Publications1 PublicationAdd BLAST | 71 | |
Alternative sequenceiVSP_014139 | 264 – 278 | Missing in isoform 3, isoform 4, isoform 6 and isoform 8. 2 Publications1 PublicationAdd BLAST | 15 | |
Alternative sequenceiVSP_047291 | 425 – 441 | Missing in isoform 6 and isoform 7. Curated1 PublicationAdd BLAST | 17 | |
Alternative sequenceiVSP_047292 | 566 – 578 | Missing in isoform 5, isoform 7 and isoform 8. Curated1 PublicationAdd BLAST | 13 | |
Alternative sequenceiVSP_014140 | 579 – 624 | AAARG…WSRRE → GEWEQALGGGPPPGSQACAS SPLPSPSVFSGSGRQGPRGS APLLSR in isoform 4. 1 PublicationAdd BLAST | 46 | |
Alternative sequenceiVSP_014141 | 625 – 791 | Missing in isoform 4. 1 PublicationAdd BLAST | 167 |
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | EF676032 mRNA Translation: ABV44615.1 EF676033 mRNA Translation: ABV44616.1 EF676034 mRNA Translation: ABV44617.1 BD292072 mRNA No translation available. AF458065 mRNA Translation: AAM77569.1 AY358840 mRNA Translation: AAQ89199.1 AY359098 mRNA Translation: AAQ89456.1 AK092907 mRNA Translation: BAC04001.1 AC018809 Genomic DNA No translation available. BC006411 mRNA No translation available. |
CCDSi | CCDS2590.1 [Q8NAC3-1] CCDS2591.2 [Q8NAC3-3] CCDS46746.1 [Q8NAC3-2] CCDS56240.1 [Q8NAC3-5] CCDS56241.1 [Q8NAC3-6] CCDS74898.1 [Q8NAC3-7] |
RefSeqi | NP_001190192.1, NM_001203263.1 [Q8NAC3-5] NP_001190193.1, NM_001203264.1 [Q8NAC3-7] NP_001190194.1, NM_001203265.1 [Q8NAC3-6] NP_116121.2, NM_032732.5 [Q8NAC3-3] NP_703190.1, NM_153460.3 [Q8NAC3-2] NP_703191.1, NM_153461.3 [Q8NAC3-1] XP_016862835.1, XM_017007346.1 |
Genome annotation databases
Ensembli | ENST00000295981; ENSP00000295981; ENSG00000163702 [Q8NAC3-1] ENST00000383812; ENSP00000373323; ENSG00000163702 [Q8NAC3-3] ENST00000403601; ENSP00000384969; ENSG00000163702 [Q8NAC3-2] ENST00000413608; ENSP00000396064; ENSG00000163702 [Q8NAC3-5] ENST00000416074; ENSP00000395315; ENSG00000163702 [Q8NAC3-7] ENST00000455057; ENSP00000407894; ENSG00000163702 [Q8NAC3-6] |
GeneIDi | 84818 |
KEGGi | hsa:84818 |
UCSCi | uc003btz.4, human [Q8NAC3-1] |
Keywords - Coding sequence diversityi
Alternative splicingSimilar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | EF676032 mRNA Translation: ABV44615.1 EF676033 mRNA Translation: ABV44616.1 EF676034 mRNA Translation: ABV44617.1 BD292072 mRNA No translation available. AF458065 mRNA Translation: AAM77569.1 AY358840 mRNA Translation: AAQ89199.1 AY359098 mRNA Translation: AAQ89456.1 AK092907 mRNA Translation: BAC04001.1 AC018809 Genomic DNA No translation available. BC006411 mRNA No translation available. |
CCDSi | CCDS2590.1 [Q8NAC3-1] CCDS2591.2 [Q8NAC3-3] CCDS46746.1 [Q8NAC3-2] CCDS56240.1 [Q8NAC3-5] CCDS56241.1 [Q8NAC3-6] CCDS74898.1 [Q8NAC3-7] |
RefSeqi | NP_001190192.1, NM_001203263.1 [Q8NAC3-5] NP_001190193.1, NM_001203264.1 [Q8NAC3-7] NP_001190194.1, NM_001203265.1 [Q8NAC3-6] NP_116121.2, NM_032732.5 [Q8NAC3-3] NP_703190.1, NM_153460.3 [Q8NAC3-2] NP_703191.1, NM_153461.3 [Q8NAC3-1] XP_016862835.1, XM_017007346.1 |
3D structure databases
Select the link destinations: PDBei RCSB PDBi PDBji Links Updated | PDB entry | Method | Resolution (Å) | Chain | Positions | PDBsum |
6HG4 | X-ray | 3.32 | B | 95-538 | [»] | |
6HG9 | X-ray | 3.62 | B | 95-538 | [»] | |
6HGA | X-ray | 2.60 | B | 279-538 | [»] | |
SMRi | Q8NAC3 | |||||
ModBasei | Search... | |||||
PDBe-KBi | Search... |
Protein-protein interaction databases
BioGRIDi | 124278, 53 interactors |
IntActi | Q8NAC3, 45 interactors |
STRINGi | 9606.ENSP00000295981 |
Chemistry databases
DrugCentrali | Q8NAC3 |
PTM databases
GlyGeni | Q8NAC3, 9 sites |
iPTMneti | Q8NAC3 |
PhosphoSitePlusi | Q8NAC3 |
Genetic variation databases
BioMutai | IL17RC |
DMDMi | 229462881 |
Proteomic databases
jPOSTi | Q8NAC3 |
PaxDbi | Q8NAC3 |
PeptideAtlasi | Q8NAC3 |
PRIDEi | Q8NAC3 |
ProteomicsDBi | 20526 20554 72669 [Q8NAC3-1] 72670 [Q8NAC3-2] 72671 [Q8NAC3-3] 72672 [Q8NAC3-4] |
Protocols and materials databases
Antibodypediai | 10412, 315 antibodies |
Genome annotation databases
Ensembli | ENST00000295981; ENSP00000295981; ENSG00000163702 [Q8NAC3-1] ENST00000383812; ENSP00000373323; ENSG00000163702 [Q8NAC3-3] ENST00000403601; ENSP00000384969; ENSG00000163702 [Q8NAC3-2] ENST00000413608; ENSP00000396064; ENSG00000163702 [Q8NAC3-5] ENST00000416074; ENSP00000395315; ENSG00000163702 [Q8NAC3-7] ENST00000455057; ENSP00000407894; ENSG00000163702 [Q8NAC3-6] |
GeneIDi | 84818 |
KEGGi | hsa:84818 |
UCSCi | uc003btz.4, human [Q8NAC3-1] |
Organism-specific databases
CTDi | 84818 |
DisGeNETi | 84818 |
GeneCardsi | IL17RC |
HGNCi | HGNC:18358, IL17RC |
HPAi | ENSG00000163702, Low tissue specificity |
MalaCardsi | IL17RC |
MIMi | 610925, gene 616445, phenotype |
neXtProti | NX_Q8NAC3 |
OpenTargetsi | ENSG00000163702 |
Orphaneti | 1334, Chronic mucocutaneous candidiasis |
PharmGKBi | PA134986616 |
VEuPathDBi | HostDB:ENSG00000163702.18 |
GenAtlasi | Search... |
Phylogenomic databases
eggNOGi | ENOG502RYE0, Eukaryota |
GeneTreei | ENSGT00730000111286 |
HOGENOMi | CLU_026893_1_0_1 |
InParanoidi | Q8NAC3 |
OMAi | CLWSDSL |
OrthoDBi | 297610at2759 |
PhylomeDBi | Q8NAC3 |
TreeFami | TF335852 |
Enzyme and pathway databases
PathwayCommonsi | Q8NAC3 |
Reactomei | R-HSA-448424, Interleukin-17 signaling |
SIGNORi | Q8NAC3 |
Miscellaneous databases
BioGRID-ORCSi | 84818, 6 hits in 875 CRISPR screens |
ChiTaRSi | IL17RC, human |
GeneWikii | IL17RC |
GenomeRNAii | 84818 |
Pharosi | Q8NAC3, Tclin |
PROi | PR:Q8NAC3 |
RNActi | Q8NAC3, protein |
SOURCEi | Search... |
Gene expression databases
Bgeei | ENSG00000163702, Expressed in adenohypophysis and 207 other tissues |
ExpressionAtlasi | Q8NAC3, baseline and differential |
Genevisiblei | Q8NAC3, HS |
Family and domain databases
InterProi | View protein in InterPro IPR039465, IL-17_rcpt-like IPR027841, IL-17_rcpt_C/E_N IPR013568, SEFIR_dom |
PANTHERi | PTHR15583, PTHR15583, 1 hit |
Pfami | View protein in Pfam PF15037, IL17_R_N, 1 hit PF08357, SEFIR, 1 hit |
PROSITEi | View protein in PROSITE PS51534, SEFIR, 1 hit |
ProtoNeti | Search... |
MobiDBi | Search... |
Entry informationi
Entry namei | I17RC_HUMAN | |
Accessioni | Q8NAC3Primary (citable) accession number: Q8NAC3 Secondary accession number(s): A8BWC1 Q9BR97 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | June 21, 2005 |
Last sequence update: | May 5, 2009 | |
Last modified: | February 10, 2021 | |
This is version 150 of the entry and version 2 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Chordata Protein Annotation Program | |
Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. |
Miscellaneousi
Keywords - Technical termi
3D-structure, Direct protein sequencing, Reference proteomeDocuments
- Human chromosome 3
Human chromosome 3: entries, gene names and cross-references to MIM - Human entries with genetic variants
List of human entries with genetic variants - Human variants curated from literature reports
Index of human variants curated from literature reports - MIM cross-references
Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot - PDB cross-references
Index of Protein Data Bank (PDB) cross-references