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Global internal standard technology for comparative proteomics.

Asish Chakraborty1, Fred E Regnier

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.

Journal of Chromatography. A
|May 10, 2002
PubMed
Summary
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This study validates global isotope labeling (GIST) for accurate proteomics quantification. GIST successfully identified and quantified beta-galactosidase overexpression in E. coli, demonstrating its utility in biological research.

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Accurate quantification of proteins is crucial in proteomics.
  • Existing methods may face challenges in complex biological samples.

Purpose of the Study:

  • To evaluate the effectiveness of a global isotope labeling (GIST) strategy for protein quantification.
  • To demonstrate GIST's capability in identifying and quantifying specific protein changes.

Main Methods:

  • Proteins from control and experimental samples underwent tryptic digestion.
  • Differential isotopic labeling of peptides using N-Acetoxysuccinimide reagents.
  • Peptide mixture fractionation and isotope ratio analysis via mass spectrometry (MS).
  • Protein identification and quantification using tandem mass spectrometry (MS-MS).

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Main Results:

  • The GIST strategy successfully quantified protein overexpression in Escherichia coli.
  • Matrix-assisted laser desorption ionization mass spectrometry and MS-MS were employed for isotope ratio analysis.
  • MS-MS proved effective for quantifying isobaric peptides.

Conclusions:

  • Global isotope labeling (GIST) is an effective strategy for quantitative proteomics.
  • The GIST protocol enables reliable identification and quantification of protein expression changes.
  • Tandem mass spectrometry is well-suited for isobaric peptide quantification within the GIST framework.