Presentation without proteolytic cleavage of endogenous precursors in the MHC class I antigen processing pathway

D. Buchholz, P. Scott, Nilabh Shastri

Research output: Contribution to journalArticle

Abstract

The antigen presentation pathway yields peptide-MHC class I complexes on the antigen presenting cell (APC) surface for recognition by appropriate T- cells. Expression of the peptide-MHC complex on APC surface is preceded by several steps that include the generation of peptide fragments in the cytoplasm and their assembly with MHC molecules in the endoplasmic reticulum. It is now clear that MHC binding to optimally processed peptides in the endoplasmic reticulum is obligatory for their stable expression on the cell surface. However, whether a similar obligatory relationship exists between generation of processed peptides and their expression as peptide-MHC on APC surface is not known. Here, we addressed this question by analyzing the processing of ovalbumin (aa257-264, SL8) or influenza nucleoprotein (aa366- 374, AM9) analogs. We examined the generation of naturally processed peptides using precursors that did, or did not, contain residues flanking the optimal MHC-binding peptides. By characterizing the peptides generated from these precursors by T-cell stimulation assays and by high performance liquid chromatography analysis, we established that intracellular assembly of peptide-MHC complexes and their expression on the cell surface can occur with peptides that lack flanking residues. The presentation of these endogenously synthesized perfect fit peptides demonstrates that the cleavage of precursor polypeptides is an independent step in the antigen presentation pathway.

Original languageEnglish (US)
Pages (from-to)6515-6522
Number of pages8
JournalJournal of Biological Chemistry
Volume270
Issue number12
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

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Histocompatibility Antigens Class I
Antigen Presentation
Peptides
Processing
Antigen-Presenting Cells
T-cells
Endoplasmic Reticulum
T-Lymphoid Precursor Cells
Antigens
Peptide Fragments
Nucleoproteins
Ovalbumin
High performance liquid chromatography
Human Influenza
Assays
Cytoplasm
High Pressure Liquid Chromatography

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Presentation without proteolytic cleavage of endogenous precursors in the MHC class I antigen processing pathway. / Buchholz, D.; Scott, P.; Shastri, Nilabh.

In: Journal of Biological Chemistry, Vol. 270, No. 12, 01.01.1995, p. 6515-6522.

Research output: Contribution to journalArticle

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