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Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Proteasome isoforms exhibit only quantitative differences in cleavage and epitope generation.

Michele Mishto1, Juliane Liepe, Kathrin Textoris-Taube

  • 1Institut für Biochemie, Charité - Universitätsmedizin Berlin, Berlin, Germany; Centro Interdipartimentale di Ricerca sul Cancro "Giorgio Prodi,", University of Bologna, Bologna, Italy.

European Journal of Immunology
|September 19, 2014
PubMed
Summary

Immunoproteasomes and standard proteasomes generate antigenic peptides. Differences in MHC class I antigen presentation stem from quantitative, not qualitative, peptide production by these proteasome isoforms.

Keywords:
Antigen presentationImmunoproteasomeMHC class I restricted epitopesProteasomeProteolysis

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Immunoproteasomes are hypothesized to optimize antigen processing for MHC class I epitope presentation.
  • The precise biochemical influence of immunoproteasomes on the quality versus quantity of antigenic peptides remains unclear.

Purpose of the Study:

  • To quantify cleavage-site usage and peptide generation by human standard- and immunoproteasomes.
  • To investigate the impact of immunoproteasome deficiency on peptide repertoire and MHC class I epitope production.

Main Methods:

  • Quantification of cleavage-site usage in human standard- and immunoproteasomes.
  • Analysis of peptides generated from model polypeptides by different proteasome isoforms.
  • Comparison of proteasomes from standard and immuno-subunit-deficient mice.

Main Results:

  • Distinct proteasome isoforms exhibited significant quantitative differences in cleavage-site usage and epitope production.
  • No evidence was found for abolished specific cleavage-site usage across proteasome isoforms.
  • The quality of generated peptides was not different between standard and immunoproteasomes, irrespective of substrate.

Conclusions:

  • Differences in MHC class I antigen presentation between standard and immunoproteasomes are attributed to quantitative variations in peptide generation.
  • Immunoproteasomes influence the quantity, but not the quality, of the antigenic peptide pool presented by MHC class I.