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Related Experiment Videos

18O-labeling quantitative proteomics using an ion trap mass spectrometer.

Jun Sakai1, Shinichi Kojima, Kazunori Yanagi

  • 1Genomic Science Laboratories, Sumitomo Pharmaceuticals Co., Ltd., Osaka 554-0022, Japan. sakai@sumitomopharm.co.jp

Proteomics
|March 4, 2005
PubMed
Summary

This study introduces a novel 18O-labeling technique for accurate protein quantitation in complex mixtures. This method offers improved recovery and fewer isotope effects compared to existing proteomics tools.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate protein quantitation is crucial for understanding biological processes.
  • Existing methods like isotope-coded affinity tag (ICAT) have limitations.

Purpose of the Study:

  • To present a novel and efficient method for simultaneous protein identification and quantitation.
  • To demonstrate the accuracy and advantages of the 18O-labeling technique.

Main Methods:

  • Utilizing 18O-labeling via enzymatic digestion in 18O-water.
  • Coupling 18O-labeling with capillary-liquid chromatography electrospray ion-trap mass spectrometry.
  • Performing spike tests to validate accuracy in complex mixtures.

Main Results:

Related Experiment Videos

  • The 18O-labeling method accurately quantifies proteins within complex mixtures.
  • Averaging difference ratios of multiple peptides enhances quantitation accuracy.
  • The 18O-labeling method shows superior recovery and fewer isotope effects than ICAT.

Conclusions:

  • 18O-labeling is a powerful, accurate, and efficient tool for large-scale proteomics.
  • This method provides a reliable approach for protein identification and quantitation.
  • The technique offers significant advantages over existing isotope-coding strategies.