Journal
NATURE IMMUNOLOGY
Volume 1, Issue 5, Pages 413-418Publisher
NATURE AMERICA INC
DOI: 10.1038/80852
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- NIDA NIH HHS [DA 02243] Funding Source: Medline
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The proteasome generates exact major histocompatibility complex (MHC) class I ligands as well as NH2-terminal-extended precursor peptides, The proteases responsible for the final NH2-terminal trimming of the precursor peptides had, until now, not been determined, By using specific selective criteria we purified two cytosolic proteolytic activities, puromycin-sensitive aminopeptidase and bleomycin hydrolase,These proteases could remove NH2-terminal amino acids from the vesicular stomatitis virus nucleoprotein cytotoxic T cell epitope 52-59 (RGYVYQGL) resulting, in combination with proteasomes, in the generation of the correct epitope, Our data provide evidence for the existence of redundant systems acting downstream of the proteasome in the antigen-processing pathway for MHC class I molecules.
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