Direct quantitation of MHC-bound peptide epitopes by selected reaction monitoring

Proteomics. 2011 Jun;11(11):2336-40. doi: 10.1002/pmic.201000531. Epub 2011 May 20.


We describe a cell-free approach that employs selected reaction monitoring (SRM) in tandem mass spectrometry to identify and quantitate T-cell epitopes. This approach utilises multiple epitope-specific SRM transitions to identify known T-cell epitopes and an absolute quantitation (AQUA) peptide strategy to afford AQUA. The advantage of a mass spectrometry-based approach over more traditional cell-based assays resides in the robustness and transferability of an SRM approach between laboratories and the ability of this strategy to detect multiple peptides simultaneously without the requirement of epitope-specific reagents such as T-cell lines. Thus, the SRM strategy for epitope quantitation will find application in studies of antigen density, the link between epitope abundance and immunogenicity, the dynamic range of epitope presentation and the abundance of T-cell epitopes in disease.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antigen Presentation
  • Cells, Cultured
  • Drug Discovery
  • Epitopes, T-Lymphocyte / chemistry*
  • Epitopes, T-Lymphocyte / metabolism
  • HLA Antigens / analysis*
  • HLA Antigens / chemistry
  • Mass Spectrometry / methods*
  • Mice
  • Mice, Inbred C57BL
  • Ovalbumin
  • Peptide Fragments
  • Peptides / chemistry
  • Peptides / immunology*
  • Peptides / metabolism
  • Protein Binding
  • Systems Biology


  • Epitopes, T-Lymphocyte
  • HLA Antigens
  • OVA-8
  • Peptide Fragments
  • Peptides
  • Ovalbumin