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Related Experiment Videos

Quantitative proteome analysis by solid-phase isotope tagging and mass spectrometry.

Huilin Zhou1, Jeffrey A Ranish, Julian D Watts

  • 1Institute for Systems Biology, 1441 North 34th Street, Seattle, WA 98103-8904, USA.

Nature Biotechnology
|May 1, 2002
PubMed
Summary

This study introduces a solid-phase method for stable isotope labeling of cysteinyl peptides, simplifying complex proteomic analyses. The new technique offers improved efficiency and sensitivity compared to existing methods like isotope-coded affinity tag (ICAT).

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Area of Science:

  • Proteomics and Mass Spectrometry
  • Chemical Biology and Biotechnology

Background:

  • Solid-phase synthesis is crucial for automating biotechnological processes like peptide and oligonucleotide synthesis.
  • Accurate quantification of peptides in complex mixtures is vital for understanding cellular processes.

Purpose of the Study:

  • To develop a site-specific, stable isotopic labeling method for cysteinyl peptides using solid-phase capture and release.
  • To enable efficient isolation and analysis of labeled peptides for quantitative proteomics.
  • To compare the performance of this new method against the isotope-coded affinity tag (ICAT) method.

Main Methods:

  • Site-specific stable isotopic labeling of cysteinyl peptides on a solid-phase support.
  • Solid-phase capture and release of labeled peptides from complex mixtures.

Related Experiment Videos

  • Analysis of peptide sequences and relative quantities using microcapillary liquid chromatography and tandem mass spectrometry (microLC-MS/MS).

    • Main Results:

    • Successfully labeled and isolated cysteinyl peptides from complex mixtures using the solid-phase method.
    • Detected galactose-induced changes in protein abundance in Saccharomyces cerevisiae.
    • Demonstrated that the solid-phase method is simpler, more efficient, and more sensitive than the ICAT method.

    Conclusions:

    • The developed solid-phase method provides a robust and sensitive approach for stable isotope labeling of cysteinyl peptides.
    • This method facilitates quantitative proteomic studies, enabling the detection of changes in protein abundance.
    • The solid-phase technique offers significant advantages over existing methods for peptide labeling and quantification.