HLA class II histocompatibility antigen, DP beta 1 chain

NameHLA class II histocompatibility antigen, DP beta 1 chain
Synonyms
  • HLA class II histocompatibility antigen, DP(W4) beta chain
  • HLA-DP1B
  • MHC class II antigen DPB1
Gene NameHLA-DPB1
OrganismHuman
Amino acid sequence
>lcl|BSEQ0008836|HLA class II histocompatibility antigen, DP beta 1 chain
MMVLQVSAAPRTVALTALLMVLLTSVVQGRATPENYLFQGRQECYAFNGTQRFLERYIYN
REEFARFDSDVGEFRAVTELGRPAAEYWNSQKDILEEKRAVPDRMCRHNYELGGPMTLQR
RVQPRVNVSPSKKGPLQHHNLLVCHVTDFYPGSIQVRWFLNGQEETAGVVSTNLIRNGDW
TFQILVMLEMTPQQGDVYTCQVEHTSLDSPVTVEWKAQSDSARSKTLTGAGGFVLGLIIC
GVGIFMHRRSKKVQRGSA
Number of residues258
Molecular Weight29159.195
Theoretical pINot Available
GO Classification
Functions
  • peptide antigen binding
Processes
  • T cell costimulation
  • T cell receptor signaling pathway
  • interferon-gamma-mediated signaling pathway
  • positive regulation of T cell activation
  • antigen processing and presentation of exogenous peptide antigen via MHC class II
  • cytokine-mediated signaling pathway
  • positive regulation of T cell proliferation
  • positive regulation of interferon-gamma production
Components
  • endosome membrane
  • transport vesicle membrane
  • membrane
  • ER to Golgi transport vesicle membrane
  • plasma membrane
  • cell surface
  • clathrin-coated endocytic vesicle membrane
  • Golgi membrane
  • integral component of lumenal side of endoplasmic reticulum membrane
  • MHC class II protein complex
  • trans-Golgi network membrane
  • endocytic vesicle membrane
  • lysosomal membrane
General FunctionPeptide antigen binding
Specific FunctionBinds 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.
Pfam Domain Function
Transmembrane Regions226-246
GenBank Protein IDNot Available
UniProtKB IDP04440
UniProtKB Entry NameDPB1_HUMAN
Cellular LocationCell membrane
Gene sequence
>lcl|BSEQ0017609|HLA class II histocompatibility antigen, DP beta 1 chain (HLA-DPB1)
ATGATGGTTCTGCAGGTTTCTGCGGCCCCCCGGACAGTGGCTCTGACGGCGTTACTGATG
GTGCTGCTCACATCTGTGGTCCAGGGCAGGGCCACTCCAGAGAATTACCTTTTCCAGGGA
CGGCAGGAATGCTACGCGTTTAATGGGACACAGCGCTTCCTGGAGAGATACATCTACAAC
CGGGAGGAGTTCGCGCGCTTCGACAGCGACGTGGGGGAGTTCCGGGCGGTGACGGAGCTG
GGGCGGCCTGCTGCGGAGTACTGGAACAGCCAGAAGGACATCCTGGAGGAGAAGCGGGCA
GTGCCGGACAGGATGTGCAGACACAACTACGAGCTGGGCGGGCCCATGACCCTGCAGCGC
CGAGTCCAGCCTAGGGTGAATGTTTCCCCCTCCAAGAAGGGGCCCTTGCAGCACCACAAC
CTGCTTGTCTGCCACGTGACGGATTTCTACCCAGGCAGCATTCAAGTCCGATGGTTCCTG
AATGGACAGGAGGAAACAGCTGGGGTCGTGTCCACCAACCTGATCCGTAATGGAGACTGG
ACCTTCCAGATCCTGGTGATGCTGGAAATGACCCCCCAGCAGGGAGATGTCTACACCTGC
CAAGTGGAGCACACCAGCCTGGATAGTCCTGTCACCGTGGAGTGGAAGGCACAGTCTGAT
TCTGCCCGGAGTAAGACATTGACGGGAGCTGGGGGCTTCGTGCTGGGGCTCATCATCTGT
GGAGTGGGCATCTTCATGCACAGGAGGAGCAAGAAAGTTCAACGAGGATCTGCATAA
GenBank Gene IDNot Available
GeneCard IDNot Available
GenAtlas IDNot Available
HGNC IDHGNC:4940
Chromosome Location6
LocusNot Available
References
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