HLA class II histocompatibility antigen, DRB1 beta chain (HLA-DRB1*03:01) (HLA-DRB1*03:01)

HLA-DRB1*03:01 is a specific allele of the Human Leukocyte Antigen (HLA) class II beta chain, which forms a heterodimer with the alpha chain to create the HLA-DR molecule (UniProt: P01912). The peptide-binding groove of this molecule plays a critical role in the adaptive immune system by presenting exogenous peptides to CD4+ T-helper cells. This specific allele is highly associated with several autoimmune conditions, including Type 1 Diabetes, Graves' disease, and Systemic Lupus Erythematosus, where it may inappropriately present self-antigens, leading to a loss of immune tolerance (PMID: 11889178, PMID: 15099134). The groove features specific pockets (P1, P4, P6, P7, and P9) that dictate the binding affinity of peptide side chains, which is a key determinant of the immune repertoire. Therapeutic strategies targeting the HLA-DRB1*03:01 peptide-binding groove often involve the use of peptide mimetics or small molecules designed to block the presentation of pathogenic self-peptides or to induce regulatory T-cell responses. Understanding the structural motifs of this groove is essential for developing precision immunotherapies that can modulate the immune response without causing broad immunosuppression (PMID: 15604398).

Other names

HLA-DR3DRB1*0301MHC class II antigen DRB1*03:01Human leukocyte antigen DRB1*03:01DRB1*03:01 peptide-binding groove

Competitive inhibition of peptide binding within the MHC groove to prevent pathogenic T-cell activation or to induce immune tolerance through the presentation of altered peptide ligands.