Control of antigen presentation by a single protease cleavage site

Antony N. Antoniou, Sarah Louise Blackwood, Daniela Mazzeo, Colin Watts

Research output: Contribution to journalArticlepeer-review

131 Citations (Scopus)

Abstract

Protein antigens require limited proteolytic processing to generate peptides for binding to class II MHC molecules, but the proteases and processing sites involved are largely unknown. Here we analyze the effect of eliminating the three major asparagine endopeptidase (AEP)-processing sites in the microbial antigen tetanus toxin C fragment. The mutant antigen is highly resistant to proteolysis by AEP and crude lysosomal extracts and is dramatically impaired in its ability to be processed and presented to T cells. Remarkably, processing at a single asparagine residue (1219) is obligatory for optimal presentation of many T cell epitopes in this antigen. These studies demonstrate that cleavage at a single processing site can be crucial for effective antigen presentation.
Original languageEnglish
Pages (from-to)391-398
Number of pages8
JournalImmunity
Volume12
Issue number4
DOIs
Publication statusPublished - Apr 2000
Externally publishedYes

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