HLA-DP84Gly constitutively presents endogenous peptides generated by the class I antigen processing pathway

Classical antigen processing leads to the presentation of antigenic peptides derived from endogenous and exogenous sources for MHC class I and class II molecules, respectively. Here we show that, unlike other class II molecules, prevalent HLA-DP molecules with β-chains encoding Gly84 (DP 84Gly ) constitutively present endogenous peptides. DP 84Gly does not bind invariant chain (Ii) via the class II-associated invariant chain peptide (CLIP)...