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Related Concept Videos

Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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Quantitative bottom-up proteomics depends on digestion conditions.

Mark S Lowenthal1, Yuxue Liang, Karen W Phinney

  • 1Biomolecular Measurement Division, National Institute of Standards and Technology , 100 Bureau Drive, Stop 8314, Gaithersburg, Maryland 20899-8315, United States.

Analytical Chemistry
|December 4, 2013
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Summary

Protein digestion protocols significantly impact peptide quantification accuracy in proteomics and biomarker discovery. Variations in digestion conditions lead to non-stoichiometric peptide yields, complicating absolute protein quantification.

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Area of Science:

  • Proteomics
  • Biomarker Discovery
  • Clinical Diagnostics

Background:

  • Accurate quantification of peptides is crucial for proteomics, biomarker discovery, and clinical assays.
  • Variability in protein digestion protocols can introduce significant quantitative errors.

Purpose of the Study:

  • To assess the impact of different protein digestion protocols on quantitative variability.
  • To investigate the kinetics of peptide release during enzymatic digestion.

Main Methods:

  • Human serum albumin (HSA) was digested using 12 different methods and a timecourse of trypsinolysis.
  • Stable isotope-labeled (15N) HSA was used as an internal standard.
  • Quantification was performed using liquid chromatography-tandem mass spectrometry (LC-MS/MS) with multiple-reaction monitoring (MRM).

Main Results:

  • Significant quantitative variability was observed across different digestion protocols.
  • Peptide release kinetics were complex and dependent on digestion conditions and protein structure.
  • Non-stoichiometric peptide concentrations were observed, even for proteotypic peptides.

Conclusions:

  • Enzymatic protein digestion is often non-stoichiometric, posing challenges for absolute protein quantification.
  • Careful selection of internal standards and isotope dilution techniques are essential for accurate protein quantification.