MHC I Ligand

Acetyl-6-formylpterin (Ac-6-FP) is a hapten that stabilizes MR1 on antigen-presenting cells, forming an MR1:A6FP complex that fails to activate MAIT cell TCR, thereby acting as a competitive inhibitor of MAIT cell activation. Acetyl-6-formylpterin exacerbates house dust mite-induced airway hyperresponsiveness and elevates circulating IgE levels. Acetyl-6-formylpterin reduces systemic MAIT cell activity and decreases the frequency of IL-17A⁺ and IFNγ⁺ MAIT cells in the spleen. Acetyl-6-formylpterin is useful for the study of allergic asthma.

ESAT6 Epitope is a ESAT6 CD4⁺ T cell epitope. ESAT6 Epitope binds to MHC class I molecules with an IC₅₀ value of approximately 180 nM. ESAT6 Epitope has weak immunogenicity. ESAT6 Epitope can be used in studies related to pulmonary tuberculosis.

VMAPRTLFL is a 9-mer peptide derived from the signal peptide of HLA-G and can serve as a peptide ligand for HLA-E. VMAPRTLFL plays a crucial role in regulating the functions of adaptive natural killer (NK) cells. Specifically, VMAPRTLFL enriches FcεRγ^- adaptive NK cells, upregulates the expression of CD25, and enhances their proliferative activity, antibody-dependent cellular cytotoxicity (ADCC), and IFN-γ release. VMAPRTLFL can be used in research related to human cytomegalovirus (HCMV) infection, transplant rejection, and pregnancy immunity.