HLA Class 1 Antigen B27 (HLA-B) Antibody – Mouse Monoclonal

HLA-B belongs to the HLA class I heavy chain paralogues. This class I molecule is a heterodimer consisting of a heavy chain and a light chain (beta-2 microglobulin). The heavy chain is anchored in the membrane. Class I molecules play a central role in the immune system by presenting peptides derived from the endoplasmic reticulum lumen. They are expressed in nearly all cells. The heavy chain is approximately 45 kDa and its gene contains 8 exons. Exon 1 encodes the leader peptide, exon 2 and 3 encode the alpha1 and alpha2 domains, which both bind the peptide, exon 4 encodes the alpha3 domain, exon 5 encodes the transmembrane region and exons 6 and 7 encode the cytoplasmic tail. Polymorphisms within exon 2 and exon 3 are responsible for the peptide binding specificity of each class one molecule. Typing for these polymorphisms is routinely done for bone marrow and kidney transplantation. Hundreds of HLA-B alleles have been described. [provided by RefSeq, Jul 2008]

HLAB iso7: Involved in the presentation of foreign antigens to the immune system. Belongs to the MHC class I family.

Protein type: Immunoglobulin superfamily; Membrane protein, integral

Chromosomal Location of Human Ortholog: 6p21.3

Cellular Component: Golgi membrane; Golgi apparatus; phagocytic vesicle membrane; cell surface; membrane; endoplasmic reticulum; integral to plasma membrane; early endosome membrane; integral to membrane; plasma membrane; MHC class I protein complex

Molecular Function: peptide antigen binding; chaperone binding; TAP binding; receptor binding

Biological Process: regulation of immune response; detection of bacterium; regulation of interleukin-12 production; viral reproduction; positive regulation of T cell mediated cytotoxicity; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-independent; cytokine and chemokine mediated signaling pathway; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; defense response; protection from natural killer cell mediated cytotoxicity; antigen processing and presentation of peptide antigen via MHC class I; antigen processing and presentation of endogenous peptide antigen via MHC class I via ER pathway, TAP-independent; regulation of T cell anergy; regulation of interleukin-6 production; antigen processing and presentation of exogenous peptide antigen via MHC class I; innate immune response; immune response