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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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Peptide Identification Using Tandem Mass Spectrometry01:33

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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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Related Experiment Video

Updated: Apr 15, 2026

A Mass Spectrometry-Based Proteomics Approach for Global and High-Confidence Protein R-Methylation Analysis
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Proteomics beyond trypsin.

Liana Tsiatsiani1, Albert J R Heck1

  • 1Biomolecular Mass Spectrometry and Proteomics Bijvoet Centre for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Netherlands Proteomics Center, The Netherlands.

The FEBS Journal
|April 1, 2015
PubMed
Summary
This summary is machine-generated.

The exclusive use of trypsin in proteomics limits our understanding of the proteome. Exploring alternative proteases enhances proteome sequence coverage and post-translational modification identification, particularly in middle-down proteomics.

Keywords:
bias in quantitative proteomicscleavage specificitydigestionmass spectrometrymiddle-down proteomicsproteasesprotein post-translational modificationsshotgun proteomics

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Biochemistry

Background:

  • Peptide-centered shotgun proteomics, primarily using trypsin, has driven major biological discoveries.
  • However, the reliance on trypsin may lead to an incomplete view of the proteome.
  • This limitation affects the comprehensive analysis of protein post-translational modifications.

Purpose of the Study:

  • To highlight the limitations of trypsin-exclusive proteomics.
  • To review alternative proteases suitable for proteomics applications.
  • To emphasize the benefits of middle-down proteomics for enhanced proteome coverage.

Main Methods:

  • Reviewing the properties of various proteases used in proteomics.
  • Analyzing the shortcomings of trypsin in protein digestion.
  • Discussing protease characteristics beneficial for middle-down proteomics.

Main Results:

  • The nearly exclusive use of trypsin restricts proteome analysis.
  • Alternative proteases and multi-protease digestion increase sequence coverage.
  • Middle-down proteomics yields complementary peptides, improving PTM identification.

Conclusions:

  • Adopting alternative proteases beyond trypsin is crucial for a more complete proteome analysis.
  • New protease discovery can further advance proteomics and middle-down approaches.
  • Comprehensive proteomic datasets generated with diverse proteases unlock novel biological insights.