HLA-DMB
Description
The HLA-DMB (major histocompatibility complex, class II, DM beta) is a protein-coding gene located on chromosome 6.
HLA-DMB, a gene encoding the beta chain of the HLA class II histocompatibility antigen, DM, is involved in the peptide loading process of MHC class II molecules. The protein forms a heterodimer with the alpha chain (DMA) and is located in intracellular vesicles. It facilitates the release of CLIP, a peptide bound to MHC class II molecules, enabling the acquisition of antigenic peptides. HLA-DMB is expressed in antigen presenting cells, including B lymphocytes, dendritic cells, and macrophages. The gene contains 6 exons, encoding different domains of the protein, including the leader peptide, extracellular domains, transmembrane domain, and cytoplasmic tail. Notably, HLA-DMB expression is elevated in tumor tissue of Caucasian patients, suggesting a potential role in tumor immunology. This upregulation is associated with increased T-cell infiltration and improved prognosis in ovarian cancer, highlighting its importance in the immune response against tumors.
HLA-DMB plays a vital role in the release of CLIP (class II-associated invariant chain peptide) from newly synthesized MHC class II molecules, making the peptide binding site available for acquiring antigenic peptides. In B-cells, the interaction between HLA-DM and MHC class II molecules is regulated by HLA-DO.
HLA-DMB is also known as D6S221E, RING7.
