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Entry version 200 (16 Oct 2019)
Sequence version 3 (01 Feb 1991)
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Protein

HLA class I histocompatibility antigen, B alpha chain

Gene

HLA-B

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score:

Annotation score:5 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>
-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>

<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. In complex with B2M/beta 2 microglobulin displays primarily viral and tumor-derived peptides on antigen-presenting cells for recognition by alpha-beta T cell receptor (TCR) on HLA-A-restricted CD8-positive T cells, guiding antigen-specific T cell immune response to eliminate infected or transformed cells (PubMed:25808313, PubMed:29531227). May also present self-peptides derived from the signal sequence of secreted or membrane proteins, although T cells specific for these peptides are usually inactivated to prevent autoreactivity. 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 (PubMed:29531227). Typically presents intracellular peptide antigens of 8 to 13 amino acids that arise from cytosolic proteolysis via constitutive proteasome and IFNG-induced immunoproteasome. Can bind different peptides containing allele-specific binding motifs, which are mainly defined by anchor residues at position 2 and 9 (PubMed:25808313, PubMed:29531227).2 Publications
Allele B*07:02: Presents a long peptide (APRGPHGGAASGL) derived from the cancer-testis antigen CTAG1A/NY-ESO-1, eliciting a polyclonal CD8-positive T cell response against tumor cells.2 Publications

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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 sitei87Pathogen-derived peptide antigen1 Publication1
Binding sitei108Pathogen-derived peptide antigen1 Publication1
Binding sitei167Pathogen-derived peptide antigen1 Publication1
Binding sitei170Pathogen-derived peptide antigen1 Publication1
Binding sitei176Pathogen-derived peptide antigen1 Publication1
Binding sitei183Pathogen-derived peptide antigen1 Publication1
Binding sitei195Pathogen-derived peptide antigen1 Publication1

<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

Biological processAdaptive immunity, Host-virus interaction, Immunity, Innate immunity

<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_and_taxonomy_section">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, B alpha chain
Alternative name(s):
Human leukocyte antigen B
Short name:
HLA-B
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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
Name:HLA-BImported
Synonyms:HLAB
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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>OrganismiHomo sapiens (Human)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri9606 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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_manual">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

Organism-specific databases

Human Gene Nomenclature Database

More...
HGNCi
HGNC:4932 HLA-B

<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

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular_location_section">'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 domaini25 – 309ExtracellularSequence analysisAdd BLAST285
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular_location_section">'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>Transmembranei310 – 333HelicalSequence analysisAdd BLAST24
Topological domaini334 – 362CytoplasmicSequence analysisAdd BLAST29

Keywords - Cellular componenti

Cell membrane, Endoplasmic reticulum, Membrane, MHC I

<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

Stevens-Johnson syndrome (SJS)
Disease susceptibility is associated with variations affecting the gene represented in this entry. Increased susceptibility to Stevens-Johnson syndrome is conferred by allele B*15:02.1 Publication
Disease descriptionA rare blistering mucocutaneous disease that share clinical and histopathologic features with toxic epidermal necrolysis. Both disorders are characterized by high fever, malaise, and a rapidly developing blistering exanthema of macules and target-like lesions accompanied by mucosal involvement. Stevens-Johnson syndrome is a milder disease characterized by destruction and detachment of the skin epithelium and mucous membranes involving less than 10% of the body surface area. Ocular symptoms include ulcerative conjunctivitis, keratitis, iritis, uveitis and sometimes blindness. It can be caused by a severe adverse reaction to particular types of medication, although Mycoplasma infections may induce some cases.
Related information in OMIM
Spondyloarthropathy 1 (SPDA1)
Disease susceptibility is associated with variations affecting the gene represented in this entry. A restricted number of HLA-B27 subtypes can be associated with ankylosing spondylitis and other B27-related diseases, and an elevated frequency of the B*27:02 allele in ankylosing spondylitis patients is identified. The allele B*27:07 seems to have a protective role some populations because it was found only in the healthy controls.1 Publication
Disease descriptionA chronic rheumatic disease with multifactorial inheritance. It includes a spectrum of related disorders comprising ankylosing spondylitis, a subset of psoriatic arthritis, reactive arthritis (e.g. Reiter syndrome), arthritis associated with inflammatory bowel disease and undifferentiated spondyloarthropathy. These disorders may occur simultaneously or sequentially in the same patient, probably representing various phenotypic expressions of the same disease. Ankylosing spondylitis is the form of rheumatoid arthritis affecting the spine and is considered the prototype of seronegative spondyloarthropathies. It produces pain and stiffness as a result of inflammation of the sacroiliac, intervertebral, and costovertebral joints.
Related information in OMIM
There is evidence that HLA-B51 is associated with susceptibility to Behcet disease. However, it is not certain whether HLA-B51 itself or a closely linked gene is responsible for susceptibility. The world distribution of HLA-B51 in healthy people corresponds to the global distribution of Behcet disease; in Southern hemisphere countries (Africa, South Pacific, etc.) and in some parts of Europe, the prevalence of HLA-B51 in healthy people is low or null, corresponding to a low prevalence of Behcet disease. The wide variation that exists in the relative risk of HLA-B51 would support other nongenetic risk factors.1 Publication

Organism-specific databases

Online Mendelian Inheritance in Man (OMIM)

More...
MIMi
106300 phenotype
608579 phenotype

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<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 peptidei1 – 241 PublicationAdd BLAST24
<p>This subsection of the ‘PTM / Processing’ section describes the extent of a polypeptide chain in the mature protein following processing.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_000001883325 – 362HLA class I histocompatibility antigen, B alpha chainAdd BLAST338

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm_processing_section">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>Glycosylationi110N-linked (GlcNAc...) asparagine1 Publication1
<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 bondi125 ↔ 188PROSITE-ProRule annotation3 Publications
Disulfide bondi227 ↔ 283PROSITE-ProRule annotation3 Publications

Keywords - PTMi

Disulfide bond, Glycoprotein, Phosphoprotein

<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_section">'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_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Heterotrimer that consists of an alpha chain HLA-B, a beta chain B2M and a peptide (peptide-HLA-B-B2M) (PubMed:25808313, PubMed:29531227). Early in biogenesis, HLA-B-B2M dimer interacts with the components of the peptide-loading complex composed of TAPBP, TAP1-TAP2, TAPBPL, PDIA3/ERP57 and CALR.

Interacts with TAP1-TAP2 transporter via TAPBP; this interaction is obligatory for the loading of peptide epitopes delivered to the ER by TAP1-TAP2 transporter.

Interacts with TAPBPL; TAPBPL binds peptide-free HLA-B-B2M complexes or those loaded with low affinity peptides, likely facilitating peptide exchange for higher affinity peptides. Only optimally assembled peptide-HLA-B-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-B (via polymorphic alpha-1 and alpha-2 domains) interacts with antigen-specific TCR (via CDR1, CDR2 and CDR3 domains) (PubMed:29531227). One HLA-B molecule (mainly via nonpolymorphic alpha-3 domain) interacts with one CD8A homodimer (via CDR-like loop); this interaction insures peptide-HLA-B-B2M recognition by CD8-positive T cells only (PubMed:29531227).

2 Publications

(Microbial infection) Interacts with HTLV-1 accessory protein p12I.

1 Publication

<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

1362
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Database of comparative protein structure models

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ModBasei
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SWISS-MODEL Interactive Workspace

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SWISS-MODEL-Workspacei
Submit a new modelling project...

Protein Data Bank in Europe - Knowledge Base

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PDBe-KBi
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<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 keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family_and_domains_section">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>Domaini209 – 295Ig-like C1-typeAdd BLAST87

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<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>Regioni25 – 114Alpha-1Sequence analysisAdd BLAST90
Regioni115 – 206Alpha-2Sequence analysisAdd BLAST92
Regioni207 – 298Alpha-3Sequence analysisAdd BLAST92
Regioni299 – 309Connecting peptideSequence analysisAdd BLAST11

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Family and Domains’ section describes a short (usually not more than 20 amino acids) conserved sequence motif of biological significance.<p><a href='/help/motif' target='_top'>More...</a></p>Motifi101 – 107Bw6 motif involved in the recognition of inhibitory receptor KIR3DL1 on NK cells1 Publication7

<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
The alpha-2 domain is a structural part of the peptide-binding cleft (PubMed:25808313). Mediates the interaction with TAP1-TAP2 complex.1 Publication
The alpha-3 Ig-like domain mediates the interaction with CD8 coreceptor.

Keywords - Domaini

Signal, Transmembrane, Transmembrane helix

<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_length">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>Sequence (1+)i

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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 has 1 described isoform and 20 potential isoforms that are computationally mapped.Show allAlign All

P01889-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MLVMAPRTVL LLLSAALALT ETWAGSHSMR YFYTSVSRPG RGEPRFISVG
60 70 80 90 100
YVDDTQFVRF DSDAASPREE PRAPWIEQEG PEYWDRNTQI YKAQAQTDRE
110 120 130 140 150
SLRNLRGYYN QSEAGSHTLQ SMYGCDVGPD GRLLRGHDQY AYDGKDYIAL
160 170 180 190 200
NEDLRSWTAA DTAAQITQRK WEAAREAEQR RAYLEGECVE WLRRYLENGK
210 220 230 240 250
DKLERADPPK THVTHHPISD HEATLRCWAL GFYPAEITLT WQRDGEDQTQ
260 270 280 290 300
DTELVETRPA GDRTFQKWAA VVVPSGEEQR YTCHVQHEGL PKPLTLRWEP
310 320 330 340 350
SSQSTVPIVG IVAGLAVLAV VVIGAVVAAV MCRRKSSGGK GGSYSQAACS
360
DSAQGSDVSL TA
Length:362
Mass (Da):40,460
Last modified:February 1, 1991 - v3
<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:i5E5A7BDE031403D6
GO

<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

There are 20 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
A0A1W2PPR8A0A1W2PPR8_HUMAN
HLA class I histocompatibility anti...
HLA-B
363Annotation 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>
A0A140T9G0A0A140T9G0_HUMAN
HLA class I histocompatibility anti...
HLA-B
241Annotation 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>
A0A140T9S9A0A140T9S9_HUMAN
HLA class I histocompatibility anti...
HLA-B
241Annotation 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>
A0A140T951A0A140T951_HUMAN
HLA class I histocompatibility anti...
HLA-B
241Annotation score:

Annotation score:1 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>
A0A140T9A9A0A140T9A9_HUMAN
HLA class I histocompatibility anti...
HLA-B
241Annotation score:

Annotation score:1 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>
A0A140T9H3A0A140T9H3_HUMAN
HLA class I histocompatibility anti...
HLA-B
241Annotation score:

Annotation score:1 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>
A0A140TA02A0A140TA02_HUMAN
HLA class I histocompatibility anti...
HLA-B
224Annotation score:

Annotation score:1 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>
A0A1W2PNR7A0A1W2PNR7_HUMAN
HLA class I histocompatibility anti...
HLA-B
253Annotation score:

Annotation score:1 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>
A0A140TA11A0A140TA11_HUMAN
HLA class I histocompatibility anti...
HLA-B
224Annotation score:

Annotation score:1 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>
A0A140TA14A0A140TA14_HUMAN
HLA class I histocompatibility anti...
HLA-B
224Annotation score:

Annotation score:1 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>
There are more potential isoformsShow all

<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_in_disease">'Involvement in disease'</a> subsection.<p><a href='/help/polymorphism' target='_top'>More...</a></p>Polymorphismi

The most polymorphic of the mammalian genome. 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-B alleles. But only 17 common HLA-A alleles are considered core alleles, representing all functionally significant variation (polymorphism) in alpha-1 and alpha-2 domains. These are: B*07:02; B*08:01; B*13:02; B*15:01; B*18:01; B*27:05; B*35:01; B*37:01; B*38:01; B*40:01; B*44:02; B*45:01; B*51:01; B*54:01; B*57:01 and B*73:01. Among these, B*07:02; B*15:01; B*18:01; B*37:01; B*51:01; B*54:01; B*57:01 and B*73:01, 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 B*07:02. The sequences of core alleles and common representative alleles of serologically distinct allele groups are described as variants of B*07:02.1 Publication

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<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_0824832L → R in allele B*13:02, allele B*15:01, allele B*18:01, allele B*27:01, allele B*27:05, allele B*35:01, allele B*37:01, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*46:01, allele B*47:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01 and allele B*82:01. 34 Publications1
Natural variantiVAR_0824844M → T in allele B*13:02, allele B*15:01, allele B*18:01, allele B*27:01, allele B*27:05, allele B*35:01, allele B*37:01, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*46:01, allele B*47:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01 and allele B*82:01. 34 PublicationsCorresponds to variant dbSNP:rs1050458Ensembl.1
Natural variantiVAR_0824859V → L in allele B*13:02, allele B*18:01, allele B*27:01, allele B*27:05, allele B*37:01, allele B*40:02, allele B*44:02, allele B*47:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*59:01 and allele B*82:01. 16 Publications1
Natural variantiVAR_08248614S → W in allele B*13:02, allele B*18:01, allele B*27:01, allele B*27:05, allele B*35:01, allele B*37:01, allele B*40:02, allele B*44:02, allele B*47:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01, allele B*81:01 and allele B*82:01. 30 Publications1
Natural variantiVAR_08248715A → G in allele B*13:02, allele B*15:01, allele B*18:01, allele B*27:01, allele B*27:05, allele B*35:01, allele B*37:01, allele B*40:02, allele B*44:02, allele B*46:01, allele B*47:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01, allele B*81:01 and allele B*82:01. 33 Publications1
Natural variantiVAR_08248817L → V in allele B*13:02, allele B*18:01, allele B*27:01, allele B*27:05, allele B*35:01, allele B*37:01, allele B*40:02, allele B*44:02, allele B*47:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*57:01, allele B*58:01, allele B*78:01 and allele B*81:01. 24 Publications1
Natural variantiVAR_08248933Y → D in allele B*08:01. 3 Publications1
Natural variantiVAR_08249033Y → H in allele B*18:01, allele B*27:01, allele B*27:05, allele B*37:01, allele B*40:01, allele B*40:02, allele B*41:01, allele B*45:01, allele B*49:01, allele B*50:01 and allele B*73:01. 18 Publications1
Natural variantiVAR_08249135S → A in allele B*08:01, allele B*13:02, allele B*15:01, allele B*35:01, allele B*40:01, allele B*41:01, allele B*44:02, allele B*45:01, allele B*46:01, allele B*47:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01 and allele B*82:01. 30 PublicationsCorresponds to variant dbSNP:rs1131170Ensembl.1
Natural variantiVAR_08249236V → M in allele B*08:01, allele B*13:02, allele B*15:01, allele B*35:01, allele B*40:01, allele B*41:01, allele B*44:02, allele B*45:01, allele B*46:01, allele B*47:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01, allele B*78:01 and allele B*82:01. 30 PublicationsCorresponds to variant dbSNP:rs1050486Ensembl.1
Natural variantiVAR_08249348S → A in allele B*15:01, allele B*35:01, allele B*46:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*54:01, allele B*55:01, allele B*56:01, allele B*57:01, allele B*58:01, allele B*59:01 and allele B*78:01. 20 PublicationsCorresponds to variant dbSNP:rs713031Ensembl.1
Natural variantiVAR_08249448S → T in allele B*13:02, allele B*27:01, allele B*27:05, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*49:01, allele B*50:01 and allele B*73:01. 19 PublicationsCorresponds to variant dbSNP:rs713031Ensembl.1
Natural variantiVAR_08249554D → G in allele B*18:01. 2 Publications1
Natural variantiVAR_08249656Q → L in allele B*27:01, allele B*27:05, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*49:01 and allele B*50:01. 14 Publications1
Natural variantiVAR_08249765A → T in allele B*13:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*49:01 and allele B*50:01. 12 Publications1
Natural variantiVAR_08249869E → G in allele B*54:01. 1 Publication1
Natural variantiVAR_08249969E → K in allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*49:01 and allele B*50:01. 11 Publications1
Natural variantiVAR_08250069E → M in allele B*13:02, allele B*15:01, allele B*46:01 and allele B*57:01; requires 2 nucleotide substitutions. 8 Publications1
Natural variantiVAR_08250169E → T in allele B*18:01, allele B*35:01, allele B*37:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*58:01 and allele B*78:01; requires 2 nucleotide substitutions. 13 Publications1
Natural variantiVAR_08250270E → A in allele B*13:02, allele B*15:01, allele B*46:01 and allele B*57:01. 8 Publications1
Natural variantiVAR_08250376I → V in allele B*54:01. 1 Publication1
Natural variantiVAR_08250486R → G in allele B*57:01 and allele B*58:01. 4 Publications1
Natural variantiVAR_08250587N → E in allele B*13:02, allele B*15:01, allele B*27:01, allele B*27:05, allele B*37:01, allele B*39:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:0, allele B*46:01, allele B*47:01, allele B*48:01, allele B*49:01,allele B*50:01, allele B*52:01, allele B*57:01 and allele B*58:01; requires 2 nucleotide substitutions. 27 Publications1
Natural variantiVAR_08250689Q → R in allele B*57:01 and allele B*58:01. 4 Publications1
Natural variantiVAR_08250790I → K in allele B*46:01. 1 Publication1
Natural variantiVAR_08250890I → N in allele B*57:01 and allele B*58:01. 4 Publications1
Natural variantiVAR_08250991Y → C in allele B*14:01, allele B*27:01, allele B*27:05, allele B*38:01 and allele B*73:01. 10 Publications1
Natural variantiVAR_08251091Y → F in allele B*08:01, allele B*35:01, allele B*51:01, allele B*53:01, allele B*59:01 and allele B*78:01. 12 Publications1
Natural variantiVAR_08251191Y → M in allele B*57:01 and allele B*58:01; requires 2 nucleotide substitutions. 4 Publications1
Natural variantiVAR_08251291Y → S in allele B*13:02, allele B*15:01, allele B*18:01, allele B*37:01, allele B*39:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*48:01, allele B*49:01,allele B*50:01 and allele B*52:01. 21 Publications1
Natural variantiVAR_08251393A → R in allele B*46:01; requires 2 nucleotide substitutions. 1 Publication1
Natural variantiVAR_08251493A → T in allele B*08:01, allele B*13:02, allele B*14:01, allele B*15:01, allele B*18:01, allele B*35:01, allele B*37:01, allele B*38:01, allele B*39:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*48:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*59:01 and allele B*78:01. 29 Publications1
Natural variantiVAR_08251594Q → K in allele B*27:01, allele B*27:05 and allele B*73:01. 7 Publications1
Natural variantiVAR_08251694Q → N in allele B*08:01, allele B*13:02, allele B*14:01, allele B*15:01, allele B*18:01, allele B*35:01, allele B*37:01, allele B*38:01, allele B*39:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*48:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*59:01 and allele B*78:01; requires 2 nucleotide substitutions. 29 Publications1
Natural variantiVAR_08251794Q → S in allele B*57:01 and allele B*58:01; requires 2 nucleotide substitutions. 4 Publications1
Natural variantiVAR_08251895A → T in allele B*08:01, allele B*13:02, allele B*14:01, allele B*15:01, allele B*18:01, allele B*35:01, allele B*37:01, allele B*38:01, allele B*39:02, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*48:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*59:01 and allele B*78:01. 29 Publications1
Natural variantiVAR_08251998D → Y in allele B*13:02, allele B*15:01, allele B*18:01, allele B*27:01, allele B*35:01, allele B*37:01, allele B*38:01, allele B*40:01, allele B*40:02, allele B*41:01, allele B*44:02, allele B*45:01, allele B*47:01, allele B*48:01, allele B*49:01, allele B*50:01, allele B*51:01, allele B*52:01, allele B*53:01, allele B*57:01, allele B*58:01 and allele B*59:01. 30 Publications