HLA class II histocompatibility antigen, DR beta 3 chain

Details

Name
HLA class II histocompatibility antigen, DR beta 3 chain
Synonyms
  • MHC class II antigen DRB3
Gene Name
HLA-DRB3
Organism
Humans
Amino acid sequence
>lcl|BSEQ0052160|HLA class II histocompatibility antigen, DR beta 3 chain
MVCLKLPGGSSLAALTVTLMVLSSRLAFAGDTRPRFLELRKSECHFFNGTERVRYLDRYF
HNQEEFLRFDSDVGEYRAVTELGRPVAESWNSQKDLLEQKRGRVDNYCRHNYGVGESFTV
QRRVHPQVTVYPAKTQPLQHHNLLVCSVSGFYPGSIEVRWFRNGQEEKAGVVSTGLIQNG
DWTFQTLVMLETVPRSGEVYTCQVEHPSVTSALTVEWRARSESAQSKMLSGVGGFVLGLL
FLGAGLFIYFRNQKGHSGLQPTGFLS
Number of residues
266
Molecular Weight
29961.875
Theoretical pI
Not Available
GO Classification
Functions
MHC class II receptor activity / peptide antigen binding
Processes
adaptive immune response / antigen processing and presentation of exogenous peptide antigen via MHC class II / interferon-gamma-mediated signaling pathway / signal transduction / T cell receptor signaling pathway
Components
clathrin-coated endocytic vesicle membrane / endocytic vesicle membrane / ER to Golgi transport vesicle membrane / Golgi membrane / integral component of lumenal side of endoplasmic reticulum membrane / integral component of plasma membrane / late endosome membrane / lysosomal membrane / membrane / MHC class II protein complex / plasma membrane / trans-Golgi network membrane / transport vesicle membrane
General Function
Binds peptides derived from antigens that access the endocytic route of antigen presenting cells (APC) and presents them on the cell surface for recognition by the CD4 T-cells. The peptide binding cleft accommodates peptides of 10-30 residues. The peptides presented by MHC class II molecules are generated mostly by degradation of proteins that access the endocytic route, where they are processed by lysosomal proteases and other hydrolases. Exogenous antigens that have been endocytosed by the APC are thus readily available for presentation via MHC II molecules, and for this reason this antigen presentation pathway is usually referred to as exogenous. As membrane proteins on their way to degradation in lysosomes as part of their normal turn-over are also contained in the endosomal/lysosomal compartments, exogenous antigens must compete with those derived from endogenous components. Autophagy is also a source of endogenous peptides, autophagosomes constitutively fuse with MHC class II loading compartments. In addition to APCs, other cells of the gastrointestinal tract, such as epithelial cells, express MHC class II molecules and CD74 and act as APCs, which is an unusual trait of the GI tract. To produce a MHC class II molecule that presents an antigen, three MHC class II molecules (heterodimers of an alpha and a beta chain) associate with a CD74 trimer in the ER to form a heterononamer. Soon after the entry of this complex into the endosomal/lysosomal system where antigen processing occurs, CD74 undergoes a sequential degradation by various proteases, including CTSS and CTSL, leaving a small fragment termed CLIP (class-II-associated invariant chain peptide). The removal of CLIP is facilitated by HLA-DM via direct binding to the alpha-beta-CLIP complex so that CLIP is released. HLA-DM stabilizes MHC class II molecules until primary high affinity antigenic peptides are bound. The MHC II molecule bound to a peptide is then transported to the cell membrane surface. In B-cells, the interaction between HLA-DM and MHC class II molecules is regulated by HLA-DO. Primary dendritic cells (DCs) also to express HLA-DO. Lysosomal microenvironment has been implicated in the regulation of antigen loading into MHC II molecules, increased acidification produces increased proteolysis and efficient peptide loading.
Specific Function
Mhc class ii receptor activity
Pfam Domain Function
Transmembrane Regions
228-250
Cellular Location
Cell membrane
Gene sequence
>lcl|BSEQ0052161|HLA class II histocompatibility antigen, DR beta 3 chain (HLA-DRB3)
ATGGTGTGTCTGAAGCTCCCTGGAGGCTCCAGCTTGGCAGCGTTGACAGTGACACTGATG
GTGCTGAGCTCCCGACTGGCTTTCGCTGGGGACACCCGACCACGTTTCTTGGAGCTGCGT
AAGTCTGAGTGTCATTTCTTCAATGGGACGGAGCGGGTGCGGTACCTGGACAGATACTTC
CATAACCAGGAGGAGTTCCTGCGCTTCGACAGCGACGTGGGGGAGTACCGGGCGGTGACG
GAGCTGGGGCGGCCTGTCGCCGAGTCCTGGAACAGCCAGAAGGACCTCCTGGAGCAGAAG
CGGGGCCGGGTGGACAATTACTGCAGACACAACTACGGGGTTGGTGAGAGCTTCACAGTG
CAGCGGCGAGTCCATCCTCAGGTGACTGTGTATCCTGCAAAGACCCAGCCCCTGCAGCAC
CACAACCTCCTGGTCTGCTCTGTGAGTGGTTTCTATCCAGGCAGCATTGAAGTCAGGTGG
TTCCGGAACGGCCAGGAAGAGAAGGCTGGGGTGGTGTCCACGGGCCTGATCCAGAATGGA
GACTGGACCTTCCAGACCCTGGTGATGCTAGAAACAGTTCCTCGGAGTGGAGAGGTTTAC
ACTTGCCAAGTGGAGCACCCAAGCGTAACGAGCGCTCTCACAGTGGAATGGAGAGCACGG
TCTGAATCTGCACAGAGCAAGATGCTGAGTGGAGTCGGGGGCTTTGTGCTGGGCCTGCTC
TTCCTTGGGGCCGGGCTGTTCATCTACTTCAGGAATCAGAAAGGACACTCTGGACTTCAG
CCAACAGGATTCCTGAGCTGA
Chromosome Location
6
Locus
6p21.3
External Identifiers
ResourceLink
UniProtKB IDP79483
UniProtKB Entry NameDRB3_HUMAN
HGNC IDHGNC:4951
General References
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Drug Relations

Drug Relations
DrugBank IDNameDrug groupPharmacological action?ActionsDetails
DB051211D09C3investigationalyesDetails
DB11294Coccidioides immitis spheruleapprovedunknownbinderDetails