<p>An evidence describes the source of an annotation, e.g. an experiment that has been published in the scientific literature, an orthologous protein, a record from another database, etc.</p>
<p><a href="/manual/evidences">More...</a></p>
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<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Experimental evidence at protein leveli
<p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>
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<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni
Antigen-presenting major histocompatibility complex class I (MHCI) molecule with an important role in reproduction and antiviral immunity (PubMed:20972337, PubMed:24091323, PubMed:20439706, PubMed:11172028, PubMed:20104487, PubMed:28649982, PubMed:29312307). In complex with B2M/beta 2 microglobulin displays a restricted repertoire of self and viral peptides and acts as a dominant ligand for inhibitory and activating killer immunoglobulin receptors (KIRs) expressed on NK cells (PubMed:16141329). In an allogeneic setting, such as during pregnancy, mediates interaction of extravillous trophoblasts with KIR on uterine NK cells and regulate trophoblast invasion necessary for placentation and overall fetal growth (PubMed:20972337, PubMed:24091323). During viral infection, may present viral peptides with low affinity for KIRs, impeding KIR-mediated inhibition through peptide antagonism and favoring lysis of infected cells (PubMed:20439706). Presents a restricted repertoire of viral peptides on antigen-presenting cells for recognition by alpha-beta T cell receptor (TCR) on HLA-C-restricted CD8-positive T cells, guiding antigen-specific T cell immune response to eliminate infected cells, particularly in chronic viral infection settings such as HIV-1 or CMV infection (PubMed:11172028, PubMed:20104487, PubMed:28649982). Both the peptide and the MHC molecule are recognized by TCR, the peptide is responsible for the fine specificity of antigen recognition and MHC residues account for the MHC restriction of T cells (By similarity). Typically presents intracellular peptide antigens of 9 amino acids that arise from cytosolic proteolysis via proteasome. Can bind different peptides containing allele-specific binding motifs, which are mainly defined by anchor residues at position 2 and 9. Preferentially displays peptides having a restricted repertoire of hydrophobic or aromatic amino acids (Phe, Ile, Leu, Met, Val and Tyr) at the C-terminal anchor (PubMed:8265661, PubMed:25311805).By similarity
<p>Manually curated information which has been propagated from a related experimentally characterized protein.</p>
<p><a href="/manual/evidences#ECO:0000250">More...</a></p>
Manual assertion inferred from sequence similarity toi
<p>Manually curated information for which there is published experimental evidence.</p>
<p><a href="/manual/evidences#ECO:0000269">More...</a></p>
Manual assertion based on experiment ini
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
ALLELE C*01:02: The peptide-bound form interacts with KIR2DL2 and KIR2DL3 inhibitory receptors on NK cells. The low affinity peptides compete with the high affinity peptides impeding KIR-mediated inhibition and favoring lysis of infected cells (PubMed:20439706). Presents to CD8-positive T cells a CMV epitope derived from UL83/pp65 (RCPEMISVL), an immediate-early antigen necessary for initiating viral replication (PubMed:12947002).2 Publications
Cited for: FUNCTION (C*01:02), INTERACTION WITH KIR2DL2 AND KIR2DL3.
ALLELE C*04:01: Presents a conserved HIV-1 epitope derived from env (SFNCGGEFF) to memory CD8-positive T cells, eliciting very strong IFNG responses (PubMed:20104487). Presents CMV epitope derived from UL83/pp65 (QYDPVAALF) to CD8-positive T cells, triggering T cell cytotoxic response (PubMed:12947002).2 Publications
ALLELE C*06:02: In trophoblasts, interacts with KIR2DS2 on uterine NK cells and triggers NK cell activation, including secretion of cytokines such as GMCSF that enhances trophoblast migration.1 Publication
ALLELE C*07:02: Plays an important role in the control of chronic CMV infection. Presents immunodominant CMV epitopes derived from IE1 (LSEFCRVL and CRVLCCYVL) and UL28 (FRCPRRFCF), both antigens synthesized during immediate-early period of viral replication. Elicits a strong anti-viral CD8-positive T cell immune response that increases markedly with age.1 Publication
Cited for: X-RAY CRYSTALLOGRAPHY (1.84 ANGSTROMS) OF 26-298 (ALLELE C*08:01) IN COMPLEX WITH B2M AND PEPTIDE, FUNCTION (ALLELE C*08:01), DOMAIN, DISULFIDE BOND.
ALLELE C*12:02: Presents CMV epitope derived from UL83 (VAFTSHEHF) to CD8-positive T cells.1 Publication
Cited for: FUNCTION (ALLELES C*01:02; C*04:01; C*08:01; C*12:02 AND C*15:02).
Sites
Feature key
Position(s)
DescriptionActions
Graphical view
Length
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
1
<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni
peptide antigen binding Source: UniProtKB
<p>Inferred from Direct Assay</p>
<p>Used to indicate a direct assay for the function, process or component indicated by the GO term.</p>
<p>More information in the <a href="http://geneontology.org/page/guide%2Dgo%2Devidence%2Dcodes#ida">GO evidence code guide</a></p>
Inferred from direct assayi
immune response Source: UniProtKB
<p>Non-traceable Author Statement</p>
<p>Used for statements in the abstract, introduction or discussion of a paper that cannot be traced back to another publication.</p>
<p>More information in the <a href="http://geneontology.org/page/guide%2Dgo%2Devidence%2Dcodes#nas">GO evidence code guide</a></p>
Non-traceable author statementi
<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi
R-HSA-1236974, ER-Phagosome pathway R-HSA-1236977, Endosomal/Vacuolar pathway R-HSA-198933, Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell R-HSA-2172127, DAP12 interactions R-HSA-6798695, Neutrophil degranulation R-HSA-877300, Interferon gamma signaling R-HSA-909733, Interferon alpha/beta signaling R-HSA-983170, Antigen Presentation: Folding, assembly and peptide loading of class I MHC
<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
HLA class I histocompatibility antigen, C alpha chain
Short name:
HLA-C
Alternative name(s):
HLA-Cw
Human leukocyte antigen C
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
<p>Manually validated information which has been imported from another database.</p>
<p><a href="/manual/evidences#ECO:0000312">More...</a></p>
Manual assertion inferred from database entriesi
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>Organismi
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineagei
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
UP000005640
<p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome 6
<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
<p>Manually curated information which has been inferred by a curator based on his/her scientific knowledge or on the scientific content of an article.</p>
<p><a href="/manual/evidences#ECO:0000305">More...</a></p>
Manual assertion inferred by curator fromi
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the subcellular compartment where each non-membrane region of a membrane-spanning protein is found.<p><a href='/help/topo_dom' target='_top'>More...</a></p>Topological domaini
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei
<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi
<p>This subsection of the 'Pathology and Biotech' section provides information on the disease(s) associated with genetic variations in a given protein. The information is extracted from the scientific literature and diseases that are also described in the <a href="http://www.ncbi.nlm.nih.gov/sites/entrez?db=omim">OMIM</a> database are represented with a <a href="http://www.uniprot.org/diseases">controlled vocabulary</a> in the following way:<p><a href='/help/involvement_in_disease' target='_top'>More...</a></p>Involvement in diseasei
Cited for: INVOLVEMENT IN PSORS1 (ALLELE C*06:02).
Disease susceptibility is associated with variants affecting the gene represented in this entry. Allele C*06:02 presents a melanocyte autoantigen ADAMTSL5 (VRSRRCLRL) to Valpha3S1/Vbeta13S1 TCR on CD8-positive T cells, and may trigger an autoimmune response against melanocytes.1 Publication
Cited for: INVOLVEMENT IN PSORS1 (ALLELE C*06:02).
Disease descriptionA common, chronic inflammatory disease of the skin with multifactorial etiology. It is characterized by red, scaly plaques usually found on the scalp, elbows and knees. These lesions are caused by abnormal keratinocyte proliferation and infiltration of inflammatory cells into the dermis and epidermis.
<p>This subsection of the <a href="http://www.uniprot.org/manual/pathology%5Fand%5Fbiotech%5Fsection">'Pathology and Biotech'</a> section describes the effect of the experimental mutation of one or more amino acid(s) on the biological properties of the protein.<p><a href='/help/mutagen' target='_top'>More...</a></p>Mutagenesisi
<p>This subsection of the 'PTM / Processing' section denotes the presence of an N-terminal signal peptide.<p><a href='/help/signal' target='_top'>More...</a></p>Signal peptidei
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_0000018868
HLA class I histocompatibility antigen, C alpha chainAddBLAST
342
Amino acid modifications
Feature key
Position(s)
DescriptionActions
Graphical view
Length
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section specifies the position and type of each covalently attached glycan group (mono-, di-, or polysaccharide).<p><a href='/help/carbohyd' target='_top'>More...</a></p>Glycosylationi
Cited for: GLYCOSYLATION [LARGE SCALE ANALYSIS] AT ASN-110.
1
<p>This subsection of the PTM / Processing":/help/ptm_processing_section section describes the positions of cysteine residues participating in disulfide bonds.<p><a href='/help/disulfid' target='_top'>More...</a></p>Disulfide bondi
<p>Manual validated information which has been generated by the UniProtKB automatic annotation system.</p>
<p><a href="/manual/evidences#ECO:0000255">More...</a></p>
Manual assertion according to rulesi
Cited for: X-RAY CRYSTALLOGRAPHY (1.84 ANGSTROMS) OF 26-298 (ALLELE C*08:01) IN COMPLEX WITH B2M AND PEPTIDE, FUNCTION (ALLELE C*08:01), DOMAIN, DISULFIDE BOND.
Cited for: X-RAY CRYSTALLOGRAPHY (1.84 ANGSTROMS) OF 26-298 (ALLELE C*08:01) IN COMPLEX WITH B2M AND PEPTIDE, FUNCTION (ALLELE C*08:01), DOMAIN, DISULFIDE BOND.
<p>This subsection of the 'PTM / Processing' section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi
N-linked glycosylation at Asn-110 is required for efficient interaction with CANX and CALR chaperones and appropriate HLA-C-B2M folded conformers prior to peptide loading.2 Publications
<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni
<p>This subsection of the 'Expression' section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms. By default, the information is derived from experiments at the mRNA level, unless specified 'at protein level'.<br></br>Examples: <a href="http://www.uniprot.org/uniprot/P92958#expression">P92958</a>, <a href="http://www.uniprot.org/uniprot/Q8TDN4#expression">Q8TDN4</a>, <a href="http://www.uniprot.org/uniprot/O14734#expression">O14734</a><p><a href='/help/tissue_specificity' target='_top'>More...</a></p>Tissue specificityi
Ubiquitous. Highly expressed in fetal extravillous trophoblasts in the decidua basalis (at protein level).1 Publication
<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni
<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei
Heterotrimer that consists of an alpha chain HLA-C, a beta chain B2M and a peptide (peptide-HLA-C-B2M) (PubMed:28649982, PubMed:10850706, PubMed:24990997). Early in biogenesis, HLA-C-B2M dimer interacts with the components of the peptide-loading complex composed of TAPBP, TAP1-TAP2, TAPBPL, PDIA3/ERP57 and CALR (PubMed:18420581).
Interacts with TAP1-TAP2 transporter via TAPBP; this interaction is obligatory for the loading of peptide epitopes delivered to the endoplasmic reticulum (ER) by TAP1-TAP2 transporter (By similarity). Being very selective in the peptide binding, forms a stable interaction with TAP1-TAP2, often leading to the accumulation of free heavy chains in the ER (PubMed:18420581). Only optimally assembled peptide-HLA-C-B2M trimer translocates to the surface of antigen-presenting cells, where it interacts with TCR and CD8 coreceptor on the surface of T cells. HLA-C (via polymorphic alpha-1 and alpha-2 domains) interacts with antigen-specific TCR (via CDR3 domains) (By similarity). One HLA-C molecule (mainly via nonpolymorphic alpha-3 domain) interacts with one CD8A homodimer (via CDR-like loop); this interaction insures peptide-HLA-C-B2M recognition by CD8-positive T cells only (By similarity). The peptide-HLA-C-B2M complex also interacts with KIRs. HLA-C type 1 (C1, with Asn104), including HLA-C*02, C*04, C*05, C*06 and C*15, interact with KIR2DL1 and KIR2DS1, and HLA-C type 2 (C2, with Lys104), including HLA-C*01, C*03, C*07 and C*08, interact with KIR2DL2 and KIR2DL3 (PubMed:20972337, PubMed:24091323, PubMed:16141329, PubMed:20439706, PubMed:11323700, PubMed:10850706).
By similarity
Manual assertion inferred from sequence similarity toi
Cited for: X-RAY CRYSTALLOGRAPHY (1.84 ANGSTROMS) OF 26-298 (ALLELE C*08:01) IN COMPLEX WITH B2M AND PEPTIDE, FUNCTION (ALLELE C*08:01), DOMAIN, DISULFIDE BOND.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
(Microbial infection) Interacts with HTLV-1 p12I accessory protein.
Cited for: INTERACTION WITH HTLV-1 ACCESSORY PROTEIN P12I (MICROBIAL INFECTION).
<p>This subsection of the '<a href="http://www.uniprot.org/help/interaction%5Fsection">Interaction</a>' section provides information about binary protein-protein interactions. The data presented in this section are a quality-filtered subset of binary interactions automatically derived from the <a href="https://www.ebi.ac.uk/intact/">IntAct database</a>. It is updated at every <a href="http://www.uniprot.org/help/synchronization">UniProt release</a>.<p><a href='/help/binary_interactions' target='_top'>More...</a></p>Binary interactionsi
<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei
Secondary structure
Legend: HelixTurnBeta strandPDB Structure known for this area
<p>This subsection of the <a href="http://www.uniprot.org/help/structure%5Fsection">'Structure'</a> section is used to indicate the positions of experimentally determined beta strands within the protein sequence.<p><a href='/help/strand' target='_top'>More...</a></p>Beta strandi
<p>Manually validated information inferred from a combination of experimental and computational evidence.</p>
<p><a href="/manual/evidences#ECO:0000244">More...</a></p>
Manual assertion inferred from combination of experimental and computational evidencei
<p>This subsection of the <a href="http://www.uniprot.org/help/structure%5Fsection">'Structure'</a> section is used to indicate the positions of experimentally determined hydrogen-bonded turns within the protein sequence. These elements correspond to the DSSP secondary structure code 'T'.<p><a href='/help/turn' target='_top'>More...</a></p>Turni
<p>This subsection of the <a href="http://www.uniprot.org/help/structure%5Fsection">'Structure'</a> section is used to indicate the positions of experimentally determined helical regions within the protein sequence.<p><a href='/help/helix' target='_top'>More...</a></p>Helixi
<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi
Domains and Repeats
Feature key
Position(s)
DescriptionActions
Graphical view
Length
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni
<p>This subsection of the 'Family and domains' section provides general information on the biological role of a domain. The term 'domain' is intended here in its wide acceptation, it may be a structural domain, a transmembrane region or a functional domain. Several domains are described in this subsection.<p><a href='/help/domain_cc' target='_top'>More...</a></p>Domaini
The alpha-1 domain is a structural part of the peptide-binding cleft.1 Publication
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
The alpha-2 domain is a structural part of the peptide-binding cleft (PubMed:28649982, PubMed:10850706, PubMed:24990997). Mediates the interaction with TAP1-TAP2 complex.3 Publications
Cited for: X-RAY CRYSTALLOGRAPHY (1.84 ANGSTROMS) OF 26-298 (ALLELE C*08:01) IN COMPLEX WITH B2M AND PEPTIDE, FUNCTION (ALLELE C*08:01), DOMAIN, DISULFIDE BOND.
Cited for: X-RAY CRYSTALLOGRAPHY (2.32 ANGSTROMS) OF 26-298 (ALLELE C*05:01) IN COMPLEX WITH B2M AND PEPTIDE, X-RAY CRYSTALLOGRAPHY (2.6 ANGSTROMS) OF 26-300 (ALLELE C*07:02) IN COMPLEX WITH B2M AND PEPTIDE, SUBCELLULAR LOCATION, FUNCTION, DOMAIN.
The alpha-3 Ig-like domain mediates the interaction with CD8 coreceptor.By similarity
Manual assertion inferred from sequence similarity toi
<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequences (2+)i
<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.
<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.
This entry describes 2
<p>This subsection of the 'Sequence' section lists the alternative protein sequences (isoforms) that can be generated from the same gene by a single or by the combination of up to four biological events (alternative promoter usage, alternative splicing, alternative initiation and ribosomal frameshifting). Additionally, this section gives relevant information on each alternative protein isoform. This section is only present in reviewed entries, i.e. in UniProtKB/Swiss-Prot.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basketAdded to basket
This entry has 2 described isoforms and 45 potential isoforms that are computationally mapped.Show allAlign All
This isoform has been chosen as the
<div>
<p><b>What is the canonical sequence?</b><p><a href='/help/canonical_and_isoforms' target='_top'>More...</a></p>canonicali sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.
<p>The checksum is a form of redundancy check that is calculated
from the sequence. It is useful for tracking sequence updates.</p>
<p>It should be noted that while, in theory, two different sequences could
have the same checksum value, the likelihood that this would happen
is extremely low.</p>
<p>However UniProtKB may contain entries with identical sequences in case
of multiple genes (paralogs).</p>
<p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64)
using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1.
The algorithm is described in the ISO 3309 standard.
</p>
<p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br />
<strong>Cyclic redundancy and other checksums</strong><br />
<a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p>
Checksum:i59C23D95FD1D0BC8
The sequence of this isoform differs from the canonical sequence as follows: 153-157: DLRSW → HLRSC 297-338: SWEPSSQPTIPIMGIVAGLAVLVVLAVLGAVVTAMMCRRKSS → RW
<p>In eukaryotic reference proteomes, unreviewed entries that are likely to belong to the same gene are computationally mapped, based on gene identifiers from Ensembl, EnsemblGenomes and model organism databases.<p><a href='/help/gene_centric_isoform_mapping' target='_top'>More...</a></p>Computationally mapped potential isoform sequencesi
HLA class I histocompatibility antigen (HLA class I histocompatibility antigen C alpha chain) (HLA class I histocompatibility antigen, C alpha chain) (MHC class I antigen) (MHC class I protein)
HLA-C HLA-Cw
366
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen (HLA class I histocompatibility antigen C alpha chain) (HLA class I histocompatibility antigen, C alpha chain) (MHC class I antigen) (MHC class I histocompatibility antigen)
HLA-C HLA-Cw
366
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I antigen (HLA class I histocompatibility antigen) (HLA class I histocompatibility antigen C alpha chain) (HLA class I histocompatibility antigen Cw-1 alpha chain) (HLA class I histocompatibility antigen, C alpha chain) (HLA-C alpha chain) (MHC class I antigen) (MHC class I protein)
HLA-C HLA-Cw, HLAC
366
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain (HLA-C protein) (MHC class I antigen) (MHC class I protein)
HLA-C HLA-Cw
366
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain
HLA-C
372
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain
HLA-C
372
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I antigen (HLA class I histocompatibility antigen) (HLA class I histocompatibility antigen, C alpha chain) (HLA-C protein) (MHC class I antigen) (MHC class I histocompatibility antigen) (MHC class I protein) (Major histocompatibility complex, class I, C)
HLA-C HLA-Cw
366
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain
HLA-C
244
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain
HLA-C
372
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
HLA class I histocompatibility antigen, C alpha chain
HLA-C
244
Annotation score:
Annotation score:2 out of 5
<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
<p>This subsection of the 'Sequence' section provides information on polymorphic variants. If the variant is associated with a disease state, the description of the latter can be found in the <a href="http://www.uniprot.org/manual/involvement%5Fin%5Fdisease">'Involvement in disease'</a> subsection.<p><a href='/help/polymorphism' target='_top'>More...</a></p>Polymorphismi
Displays lower polymorphism than HLA-A and HLA-B. Polymorphic residues encode for alpha-1 and alpha-2 domains of the peptide-binding cleft, where they contribute to variations in peptide binding and TCR recognition among different alleles. The human population is estimated to have millions of HLA-C alleles. But only 14 common HLA-C alleles are considered core alleles, representing all functionally significant variation (polymorphism) in alpha-1 and alpha-2 domains. These are: C*01:02; C*02:02; C*03:02; C*04:01; C*05:01; C*06:02; C*07:01; C*07:04; C*08:01; C*12:02; C*14:02; C*15:02; C*16:01 and C*17:01. Among these, C*01:02; C*02:02; C*03:02; C*08:01; C*12:02; C*14:02 and C*15:02, were likely passed by introgression from archaic to modern humans. Functional alleles of more recent origin (non-core) were derived by recombination (PubMed:28650991). The sequence shown is that of C*07:02. The sequences of core alleles and common representative alleles of serologically distinct allele groups are described as variants of C*07:02.Curated1 Publication
<p>This subsection of the 'Sequence' section describes natural variant(s) of the protein sequence.<p><a href='/help/variant' target='_top'>More...</a></p>Natural variantiVAR_082408