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Related Experiment Video

Updated: Jul 15, 2026

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling
11:53

Quantitative Proteomics Using Reductive Dimethylation for Stable Isotope Labeling

Published on: July 1, 2014

Quantitative carbamylation as a stable isotopic labeling method for comparative proteomics.

Peggi M Angel1, Ron Orlando

  • 1Complex Carbohydrate Research Center, The Departments of Biochemistry & Molecular Biology and Chemistry, University of Georgia, 315 Riverbend Road, Athens, GA 30302-4712, USA.

Rapid Communications in Mass Spectrometry : RCM
|April 28, 2007
PubMed
Summary

A novel method uses urea for isotopic labeling in comparative proteomics, enhancing sample solubilization and peptide analysis. This carbamylation technique offers a new tool for quantitative proteomic studies.

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Published on: March 13, 2014

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Comparative proteomics requires robust methods for sample preparation and isotopic labeling.
  • Urea is a common chaotrope for protein solubilization but its use in labeling is less explored.

Purpose of the Study:

  • To develop a method for simultaneous solubilization and isotopic labeling of biological samples using urea.
  • To investigate the impact of urea-assisted carbamylation on mass spectrometry analysis.

Main Methods:

  • Developed a two-step method using 8 M urea for solubilization and isotopic labeling via carbamylation.
  • Analyzed labeled peptides using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) and electrospray ionization tandem mass spectrometry (ESI-MS/MS).
  • Quantified standard proteins (BSA, transferrin, alpha-casein) using reversed-phase chromatography coupled to ESI-MS/MS.

Main Results:

  • Carbamylation occurred on N-termini and C-terminal lysines.
  • Observed reduced intensity for C-terminally carbamylated peptides in MALDI-TOFMS.
  • ESI-MS/MS showed altered fragmentation patterns, including uniform ion distribution and water loss ions.
  • Achieved quantitative errors between 1.7-10.0% and relative standard deviations of 5.2-27.8% for protein quantitation.

Conclusions:

  • Urea-assisted carbamylation is a viable method for global isotopic labeling in comparative proteomics.
  • The method is suitable for samples requiring strong chaotropes prior to proteolysis.
  • This technique provides a new approach for quantitative proteomic analyses.