H-2 class I histocompatibility antigen, D-B alpha chain (H-2Db) (H-2Db)

H-2Db is a mouse Major Histocompatibility Complex (MHC) class I molecule encoded by the H2-D1 gene, specifically representing the 'b' haplotype common in C57BL/6 mice [1, 2]. It functions as a cell surface receptor that presents short endogenous peptides, typically 9 amino acids in length, to the T-cell receptors (TCRs) of CD8+ cytotoxic T lymphocytes [3]. This interaction is a cornerstone of the adaptive immune system, enabling the recognition and elimination of virally infected or malignant cells. In drug discovery and development, H-2Db is frequently utilized as a target in preclinical murine models to evaluate the potency of cancer vaccines and T-cell-mediated immunotherapies [4]. For example, therapeutic vaccines targeting HPV-associated cancers often utilize H-2Db-restricted peptides, such as the HPV16 E7 (49-57) epitope, to induce specific immune responses in mice [4]. The molecule's ability to form stable complexes with specific epitopes makes it a vital tool for monitoring T-cell activation via MHC tetramer assays. Understanding H-2Db's peptide-binding motifs is essential for the rational design of immunotherapeutic agents that aim to enhance or redirect the immune system against specific diseases.

Other names

H2-D1H-2D(b)MHC class I H-2DbHistocompatibility 2-D1H2-DbMouse MHC class I H-2Db

Presentation of intracellularly derived antigenic peptides to CD8+ T-cell receptors to initiate a cytotoxic immune response.