HLA-DRB3

HLA class II histocompatibility antigen, DRB3-1 beta chain is a protein that in humans is encoded by the HLA-DRB3 gene.[2]

HLA-DRB3
Available structures
PDBHuman UniProt search: PDBe RCSB
Identifiers
AliasesHLA-DRB3, HLA-DR3B, DRB1, DRw10, HLA-DR1B, HLA-DRB, SS1, major histocompatibility complex, class II, DR beta 3, HLA-DPB1, DRB3
External IDsOMIM: 612735 GeneCards: HLA-DRB3
RNA expression pattern


More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

3125

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Ensembl

n/a

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UniProt

P79483

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RefSeq (mRNA)

NM_022555

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RefSeq (protein)

NP_072049

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Location (UCSC)n/an/a
PubMed search[1]n/a
Wikidata
View/Edit Human

Function

The protein encoded by this gene belongs to the HLA class II beta chain paralogues. The class II molecule is a heterodimer consisting of an alpha (DRA) and a beta chain (DRB), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins. Class II molecules are expressed in antigen-presenting cells (APC: B lymphocytes, dendritic cells, macrophages).[2]

Gene structure and polymorphisms

The beta chain is approximately 26–28 kDa. It is encoded by 6 exons, exon one encodes the leader peptide, exons 2 and 3 encode the two extracellular domains, exon 4 encodes the transmembrane domain and exon 5 encodes the cytoplasmic tail. Within the DR molecule the beta chain contains all the polymorphisms specifying the peptide binding specificities. Typing for these polymorphisms is routinely done for bone marrow and kidney transplantation.[2]

Gene expression

DRB1 is expressed at a level five times higher than its paralogues DRB3, DRB4 and DRB5. DRB1 is present in all individuals. Allelic variants of DRB1 are linked with either none or one of the genes DRB3, DRB4 and DRB5. There are 4 related pseudogenes: DRB2, DRB6, DRB7, DRB8 and DRB9.[2]

See also

References

  1. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  2. "Entrez Gene: HLA-DRB3 major histocompatibility complex, class II, DR beta 3".

Further reading

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