Javascript is not enabled on this browser. This site will not work properly without Javascript.
PhosphoSitePlus Homepage Cell Signaling Technology
PhosphoSitePlus
HomeAbout PhosphoSiteUsing PhosphoSiteCuration ProcessContact
NIH-logos NIGMS Logo NIAAA Logo NCI Logo NIH Logo
Protein Page:
HLA-DQB1 (human)
p Phosphorylation
ac Acetylation
me Methylation
m1 Mono-methylation
m2 Di-methylation
m3 Tri-methylation
ub Ubiquitination
sm Sumoylation
ne Neddylation
gl O-GlcNAc
ga O-GalNAc
pa Palmitoylation
ad Adenylylation
sn S-Nitrosylation
ca Caspase cleavage
sc Succinylation

Overview
HLA-DQB1 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 miroenvironment has been implicated in the regulation of antigen loading into MHC II molecules, increased acidification produces increased proteolysis and efficient peptide loading. Belongs to the MHC class II family. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral
Cellular Component: Golgi membrane; membrane; lysosomal membrane; plasma membrane; trans-Golgi network membrane; endosome membrane; MHC class II protein complex
Molecular Function: MHC class II receptor activity; peptide antigen binding
Biological Process: humoral immune response mediated by circulating immunoglobulin; cytokine and chemokine mediated signaling pathway; T cell costimulation; antigen processing and presentation of exogenous peptide antigen via MHC class II; immune response; immunoglobulin production during immune response; T cell receptor signaling pathway
Reference #:  P01920 (UniProtKB)
Alt. Names/Synonyms: CELIAC1; DQB1; HLA class II histocompatibility antigen, DQ beta 1 chain; HLA-DQB; HLA-DQB1; IDDM1; lymphocyte antigen; major histocompatibility complex class II beta; major histocompatibility complex, class II, DQ beta 1; MHC class II antigen DQB1; MHC class II antigen HLA-DQ-beta-1; MHC class II DQ beta chain; MHC class II HLA-DQ beta glycoprotein; MHC class2 antigen; MHC DQ beta
Gene Symbols: HLA-DQB1
Molecular weight: 29,991 Da
Basal Isoelectric point: 6.76  Predict pI for various phosphorylation states
Select Structure to View Below

HLA-DQB1

Protein Structure Not Found.


STRING  |  Reactome  |  neXtProt  |  Protein Atlas  |  BioGPS  |  DISEASE  |  Scansite  |  Pfam  |  RCSB PDB  |  Phospho3D  |  Phospho.ELM  |  NetworKIN  |  Source  |  GeneCards  |  UniProtKB  |  Entrez-Gene  |  GenPept  |  Ensembl Gene  |  Ensembl Protein


Modification Sites and Domains Show Modification Legend
Click here to view phosphorylation modifications only

Modification Sites in Parent Protein, Orthologs, and Isoforms Show Modification Legend
 

Show Multiple Sequence Alignment


 SS 

SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.


 MS 

MS: The number of records in which this modification site was assigned using ONLY proteomic discovery-mode mass spectrometry.


       human

► Hide Isoforms
 
0 1 Y62 RVRYVTRYIYNREEY
0 1 K97-ub AEYWNSQkEVLERTR
0 6 K160-ub DFYPAQIkVRWFRND
0 1 S255-p GLIIHHRsQkGLLH_
0 3 K257-ub IIHHRsQkGLLH___
  HLA-DQB1 var1  
S62-p RVRYVTRsIYNREEY
K97 AEYWNSQKEVLERTR
K160 DFYPAQIKVRWFRND
S255 GLIIHHRSQKGLLH_
K257 IIHHRSQKGLLH___
  mouse

 
Y57 RIRSVNRYIYNREEW
P92 AEYWNSQPEILERTR
K156 DFYPAKIKVRWFRNG
S251 GLFIRHRSQKGPRGP
K253 FIRHRSQKGPRGPPP
Home  |  Curator Login With enhanced literature mining using Linguamatics I2E I2E Logo Produced by 3rd Millennium  |  Design by Digizyme
©2003-2013 Cell Signaling Technology, Inc.