The ERAP1 active site cannot productively access the N-terminus of antigenic peptide precursors stably bound onto MHC class I. - Mavridis, George; Mpakali, Anastasia; Zoidakis, Jerome; Makridakis, Manousos; Vlahou, Antonia; Kaloumenou, Eleni; Ziotopoulou, Angeliki; Georgiadis, Dimitris; Papakyriakou, Athanasios; Stratikos, Efstratios (Scientific Reports, 2021)