HLA-DR1 belongs to the HLA class II beta chain paralogues. The MHC Class II molecule is a heterodimer consisting of an alpha (DRA) and a beta chain (DRB), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins. MHC Class II molecules are expressed in antigen presenting cells (APC). The beta chain is approximately 26-28 kDa. Within the DR molecule the beta chain contains all the polymorphisms specifying the peptide binding specificities. Hundreds of DRB1 alleles have been described and typing for these polymorphisms is routinely done for bone marrow and kidney transplantation.
Clone P2-beta-3; DR-16; DRB1; DRw10; DW2.2/DR2.2; FLJ75017; FLJ76359; HLA class II histocompatibility antigen, DR-1 beta chain; HLA class II histocompatibility antigen, DRB1-15 beta chain; HLA class II histocompatibility antigen, DRB1-16 beta chain; HLA class II histocompatibility antigen, DRB1-3 chain; HLA-DR1B; HLA-DRB; HLA-DRB1*; human leucocyte antigen DRB1; lymphocyte antigen DRB1; MHC class II antigen; MHC class II antigen DRB1*15; MHC class II antigen DRB1*16; MHC class II antigen DRB1*3; MHC class II HLA-DR beta 1 chain; MHC class II HLA-DR-beta cell surface glycoprotein; MHC class II HLA-DRw10-beta; SS1; XXbac-BPG161M6.1