Coxiella burnetii peptide epitopes bound to Major Histocompatibility Complex (MHC) molecules (C. burnetii peptide-MHC complexes)

Coxiella burnetii peptide epitopes bound to Major Histocompatibility Complex (MHC) molecules are essential mediators of the host adaptive immune response against Q fever (1.1.1, 1.3.3). These complexes are formed when proteins from the intracellular bacterium C. burnetii are processed by antigen-presenting cells and displayed on the cell surface for recognition by T-cell receptors (1.3.1). MHC Class I molecules present these peptides to CD8+ cytotoxic T cells, while MHC Class II molecules present them to CD4+ helper T cells, both of which are vital for the clearance of the pathogen (1.2.2, 1.3.3). In clinical settings, the effective recognition of these epitopes is associated with bacterial clearance, whereas an inadequate T-cell response can lead to persistent or chronic infection, such as endocarditis (1.2.4, 1.3.3). These peptide-MHC complexes are the primary targets for the development of novel subunit vaccines designed to elicit protective immunity without the severe reactogenicity seen with the existing whole-cell vaccine, Q-Vax (1.2.2, 1.2.3). Current research focuses on identifying promiscuous epitopes that can bind a wide range of human leukocyte antigen (HLA) alleles to ensure broad population coverage and improved diagnostic accuracy (1.2.2, 1.3.1).

Other names

Q fever epitopesCoxiella burnetii T-cell epitopesMHC-restricted C. burnetii peptidesHLA-restricted C. burnetii epitopesC. burnetii pMHC

Stimulation of CD4+ and CD8+ T-cell responses through T-cell receptor (TCR) recognition of the peptide-MHC complex, leading to Th1 cytokine release (e.g., IFN-gamma) and intracellular killing of the pathogen (1.2.2, 1.3.3).