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Peter James

Peter James

Professor

Peter James

Critical Comparison of Multidimensional Separation Methods for Increasing Protein Expression Coverage

Author

  • Linn Antberg
  • Paolo Cifani
  • Marianne Sandin
  • Fredrik Levander
  • Peter James

Summary, in English

We present a comparison of two-dimensional separation methods and how they affect the degree of coverage of protein expression in complex mixtures. We investigated the relative merits of various protein and peptide separations prior to acidic reversed-phase chromatography directly coupled to an ion trap mass spectrometer. The first dimensions investigated were density gradient organelle fractionation of cell extracts, 1D SDS-PAGE protein separation followed by digestion by trypsin or GluC proteases, strong cation exchange chromatography, and off-gel isoelectric focusing of tryptic peptides. The number of fractions from each first dimension and the total data accumulation RP-HPLC-MS/MS time was kept constant and the experiments were run in triplicate. We find that the most critical parameters are the data accumulation time, which defines the level of under-sampling and the avoidance of peptides from high expression level proteins eluting over the entire gradient.

Department/s

  • Department of Immunotechnology

Publishing year

2012

Language

English

Pages

2644-2652

Publication/Series

Journal of Proteome Research

Volume

11

Issue

5

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Immunology in the medical area

Keywords

  • protein and peptide separation
  • methods comparison
  • off-gel isoelectric
  • focusing
  • GluC
  • trypsin
  • GelLC
  • density gradient cell fractionation
  • strong cation exchange chromatography
  • reversed-phase chromatography
  • proteome coverage

Status

Published

ISBN/ISSN/Other

  • ISSN: 1535-3893