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Peptide Identification Using Tandem Mass Spectrometry01:33

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Value of using multiple proteases for large-scale mass spectrometry-based proteomics.

Danielle L Swaney1, Craig D Wenger, Joshua J Coon

  • 1Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.

Journal of Proteome Research
|February 2, 2010
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Using multiple proteases for enzymatic digestion significantly enhances protein identification and characterization in proteomics. This approach increases the number of identified proteins and improves sequence coverage, especially for low-abundance proteins.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Biochemistry

Background:

  • Large-scale protein sequencing relies on enzymatic digestion to produce peptides for mass spectrometry.
  • Traditional methods often use a single protease, limiting comprehensive proteome analysis.

Purpose of the Study:

  • To evaluate the efficacy of using multiple proteases (trypsin, LysC, ArgC, AspN, GluC) for improved protein identification and characterization.
  • To assess if multiple proteases enhance proteome sequence coverage compared to single-protease digestion.

Main Methods:

  • Enzymatic digestion of Saccharomyces cerevisiae protein mixtures using a panel of five proteases.
  • Analysis of generated peptides via mass spectrometry with a data-dependent, decision tree-based algorithm for tailored MS(2) fragmentation.
  • Statistical analysis to determine protein identifications and false discovery rate (FDR).

Main Results:

  • Identification of 92,095 unique peptides mapping to 3,908 proteins at a 1% FDR.
  • A significant increase in identified proteins (3,908) and unique peptides (92,095) compared to single-protease (trypsin) digestion (3,313 proteins, 27,822 peptides).
  • Enhanced identification and nearly 3-fold improved sequence coverage for low-abundance proteins (<1000 copies/cell).

Conclusions:

  • Multiple protease digestion is a more effective strategy than single-protease digestion for comprehensive proteome analysis.
  • This multi-protease approach significantly increases protein identification numbers and proteome sequence coverage.
  • A substantial portion of the proteome is inaccessible with single-protease digestion, highlighting the benefit of diverse enzymatic cleavage.