HLA-DQA1 Human Recombinant Protein

HLA-DQA1 belongs to the HLA class II alpha chain paralogues. The class II molecule is a heterodimer consisting of an alpha (DQA) and a beta chain (DQB), 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). The alpha chain is approximately 33-35 kDa. It is encoded by 5 exons; exon 1 encodes the leader peptide, exons 2 and 3 encode the two extracellular domains, and exon 4 encodes the transmembrane domain and the cytoplasmic tail. Within the DQ molecule both the alpha chain and the beta chain contain the polymorphisms specifying the peptide binding specificities, resulting in up to four different molecules. Typing for these polymorphisms is routinely done for bone marrow transplantation. [provided by RefSeq, Jul 2008]

HLA-DQA1 iso4:

Protein type: Membrane protein, integral; Cell surface

Chromosomal Location of Human Ortholog: 6p21.3

Cellular Component: Golgi membrane; membrane; lysosomal membrane; integral to plasma membrane; plasma membrane; trans-Golgi network membrane; endosome membrane; MHC class II protein complex; external side of plasma membrane

Molecular Function: MHC class II receptor activity; peptide antigen binding

Biological Process: positive regulation of T cell differentiation; cytokine and chemokine mediated signaling pathway; T cell costimulation; antigen processing and presentation of exogenous peptide antigen via MHC class II; immune response; T cell receptor signaling pathway