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Shotgun Proteomics: A Relative Quantitative Approach Using Off-Gel Electrophoresis and LC-MS/MS

  • Laurent Geiser
  • Loïc Dayon
  • Ali R. Vaezzadeh
  • Denis F. Hochstrasser
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 681)

Abstract

Shotgun proteomics originated as a strategy to identify proteins in complex protein mixtures, but it is also possible to obtain information on relative quantitation with some adjustments to the procedure. After protein digestion, the resulting peptide mixture is labelled with isobaric tags. Then, labelled peptides are submitted to two orthogonal techniques: first, peptides are separated according to their isoelectric point (pI) by Off-Gel electrophoresis (OGE), a relatively new isoelectric focusing (IEF) technique; after peptide purification, they are then separated in a second dimension according to their hydrophobic properties by reversed-phase liquid chromatography (RPLC). Finally, following detection by mass spectrometry (MS) and sequencing by tandem mass spectrometry (MS/MS), proteins are matched by means of bioinformatics software, and protein ratios are calculated by comparing isobaric tagged reporter fragments to highlight the different expression of one protein in one sample relative to other samples.

Key words

Protein quantification Peptide labelling Isobaric tags Off-gel electrophoresis Tandem mass spectrometry 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Laurent Geiser
    • 1
  • Loïc Dayon
    • 2
  • Ali R. Vaezzadeh
    • 3
  • Denis F. Hochstrasser
    • 4
  1. 1.Swiss Centre for Applied Human ToxicologyGeneva UniversityGenevaSwitzerland
  2. 2.Biomedical Proteomics Research Group, Department of Structural Biology and BioinformaticsGeneva UniversityGenevaSwitzerland
  3. 3.Department of UrologyChildren’s Hospital Boston, Harvard Medical SchoolBostonUSA
  4. 4.Swiss Centre for Applied Human Toxicology, and Departments of Genetics and Laboratory Medicine, Geneva University Hospitals, School of Pharmaceutical SciencesGeneva UniversityGenevaSwitzerland

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