Abstract
In the classical MHC class I Ag presentation pathway, antigenic peptides derived from viral proteins by multiple proteolytic cleavages are transported to the endoplasmic reticulum lumen and are then exposed to ami-nopeptidase activity. In the current study, a long MHC class I natural ligand recognized by cytotoxic T lymphocytes was used to study the kinetics of degradation by aminopeptidase. The in vitro data indicate that this N-extended peptide is efficiently trimmed to a 9-mer, unless its binding to the MHC molecules protects the full-length peptide.
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