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Catch-and-release reagents for broadscale quantitative proteomics analyses.

Carlos A Gartner1, Joshua E Elias, Corey E Bakalarski

  • 1Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Journal of Proteome Research
|February 22, 2007
PubMed
Summary
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A new "catch-and-release" reagent enables precise protein quantification from minimal samples. This method simplifies workflows and reduces errors in proteomics research.

Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Stable isotope dilution is a standard for relative protein quantification.
  • Current methods require significant protein amounts and can involve complex procedures.

Purpose of the Study:

  • To develop a novel, reductively cleavable reagent for efficient relative protein quantification.
  • To enable the analysis of thousands of proteins from microgram quantities of starting material.

Main Methods:

  • Development of a biotin-linked disulfide reagent, stable to labeling conditions but cleavable by TCEP.
  • Utilizing immobilized avidin for peptide binding, washing, and direct cleavage (catch-and-release).
  • Quantitative comparison of protein abundances in distinct cellular lysates.

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Main Results:

  • Demonstrated linker stability under reducing conditions.
  • Successfully quantified 1620 out of 1840 identified proteins for differential expression from 40 microg of protein per sample.
  • Showcased simplified sample handling and reduced nonspecific interactions.

Conclusions:

  • The catch-and-release (CAR) reagent offers a robust and efficient method for large-scale relative protein quantification.
  • This technique significantly reduces sample input requirements and improves workflow efficiency in proteomics.
  • CAR reagent facilitates accurate differential expression analysis, advancing proteomic studies.