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A metal-coded affinity tag approach to quantitative proteomics.

Robert Ahrends1, Stefan Pieper, Andreas Kühn

  • 1Laboratory of Analytical and Environmental Chemistry, Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor Str. 2, 12489 Berlin, Germany.

Molecular & Cellular Proteomics : MCP
|July 14, 2007
PubMed
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The new metal-coded affinity tag (MeCAT) technique enables absolute quantification of peptides and proteins. This method uses lanthanide-loaded metal chelate complexes for precise, sensitive detection in complex biological samples.

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Quantitative analysis of protein mixtures is crucial for understanding proteome variations.
  • Existing methods often provide relative quantification of peptides and proteins.

Purpose of the Study:

  • To present the proof of concept for the novel metal-coded affinity tag (MeCAT) technique.
  • To demonstrate MeCAT's capability for absolute quantitative determination of peptides and proteins.

Main Methods:

  • Development of a metal-coded affinity tag (MeCAT) using macrocyclic metal chelate complexes (DOTA) loaded with lanthanides.
  • Attachment of MeCAT to cysteine residues of peptides and proteins.
  • Analysis of tagged molecules using flow injection inductively coupled plasma mass spectrometry (ICP-MS).

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Main Results:

  • MeCAT enabled absolute quantification of peptides and proteins with high precision and low detection limits.
  • The technique achieved a detection limit of 110 amol for bovine serum albumin.
  • Application to the Sus scrofa eye lens proteome demonstrated MeCAT's utility in complex biological mixtures.

Conclusions:

  • MeCAT is a powerful new technique for the absolute quantification of peptides and proteins.
  • The method offers high sensitivity and precision, suitable for analyzing complex biological samples at low concentrations.