Mouse Major Histocompatibility Complex Class I H-2Kb presenting SIINFEKL peptide (H-2Kb-SIINFEKL)

The Mouse Major Histocompatibility Complex Class I H-2Kb presenting SIINFEKL peptide complex is a cornerstone of cellular immunology research, representing the interaction between a mouse MHC Class I molecule (H-2Kb) and the immunodominant peptide SIINFEKL derived from residues 257-264 of chicken ovalbumin [PMID: 9151718]. This complex serves as the primary ligand for the OT-I T-cell receptor (TCR), a widely used transgenic model for studying the development, activation, and effector functions of CD8+ cytotoxic T lymphocytes [PMID: 7520112]. It is uniquely recognized by the 25-D1.1 monoclonal antibody, which allows for the direct visualization of antigen presentation on the surface of antigen-presenting cells [PMID: 9151718]. In the context of drug discovery, this complex is utilized as a model target to evaluate the potency and specificity of vaccines, TCR-like antibodies, and adoptive cell therapies such as CAR-T or TCR-T cells [PMID: 26056293]. Biologically, it facilitates the immune system's ability to detect and destroy cells harboring foreign or mutated proteins, a process critical for anti-tumor and anti-viral immunity [UniProt: P01897]. While primarily a murine research tool, it provides essential proof-of-concept data for human immunotherapies targeting specific peptide-MHC complexes.

Other names

H-2Kb/SIINFEKL complexOVA257-264-H-2KbMHC Class I H-2Kb/SIINFEKLSIINFEKL-H-2KbpMHC-SIINFEKL

The complex acts as a ligand for specific T-cell receptors (TCRs) on CD8+ T cells, triggering signal transduction through the CD3 complex to initiate cytotoxic T-lymphocyte (CTL) responses.