Discrete proteolytic intermediates in the MHC Class I antigen processing pathway and MHC I-dependent peptide trimming in the ER

Pedro Paz, Nathalie Brouwenstijn, Robin Perry, Nilabh Shastri

Research output: Contribution to journalArticlepeer-review

Abstract

The antigen processing pathway generates the peptides displayed by MHC I molecules on the cell surface. Whether these peptides are generated in the cytosol or from longer intermediates transported into the ER is unclear, because peptides other than those bound to MHC I have been difficult to find. Using a novel assay, we show that N-terminally extended antigenic analogs were associated with high-molecular weight material in the cytosol and were transported by TAP. In the ER, a nonapeptide was predominant that was converted to the final octapeptide only in presence of the appropriate MHC I molecule. The existence of extended peptides and their MHC I-dependent trimming suggest a mechanism for efficiently satisfying the distinct sequence preferences of polymorphic MHC I molecules.

Original languageEnglish (US)
Pages (from-to)241-251
Number of pages11
JournalImmunity
Volume11
Issue number2
DOIs
StatePublished - Aug 1999
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Infectious Diseases

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