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Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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Quantification of Proteins Using Peptide Immunoaffinity Enrichment Coupled with Mass Spectrometry
06:09

Quantification of Proteins Using Peptide Immunoaffinity Enrichment Coupled with Mass Spectrometry

Published on: July 31, 2011

Quantitative protein analysis by solid phase isotope tagging and mass spectrometry.

Huilin Zhou1, Rosemary Boyle, Ruedi Aebersold

  • 1Department of Chemistry & Biochemistry, University of California-San Diego, San Diego, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 6, 2004
PubMed
Summary

This study introduces a novel method for stable isotope labeling and solid-phase capture of cysteinyl peptides. This technique allows for precise quantification of protein abundance in complex biological samples.

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Published on: November 15, 2017

Area of Science:

  • Biochemistry
  • Proteomics
  • Analytical Chemistry

Background:

  • Analyzing complex protein mixtures is challenging.
  • Quantifying protein abundance across different biological contexts requires precise methods.

Purpose of the Study:

  • To develop a method for stable isotope labeling and solid-phase capture of cysteinyl peptides.
  • To enable site-specific, quantitative labeling for accurate relative peptide abundance determination.
  • To simplify complex peptide mixtures for enhanced proteomic analysis.

Main Methods:

  • Stable isotope labeling of cysteine residues.
  • Solid-phase capture of tagged cysteinyl peptides.
  • Proteolytic digestion of protein samples.
  • Microcapillary liquid chromatography and tandem mass spectrometry (microLC-MS/MS) analysis.

Main Results:

  • Successful site-specific, quantitative labeling of cysteine residues.
  • Simultaneous simplification of complex peptide mixtures via solid-phase isolation.
  • Accurate quantification of relative peptide abundance between samples.
  • Rapid identification of individual proteins from different biological contexts.

Conclusions:

  • The described method provides a robust approach for quantitative proteomics.
  • This technique facilitates the accurate analysis of protein abundance in complex biological systems.
  • The method enables efficient identification and quantification of proteins for comparative studies.