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Related Experiment Video

Updated: Apr 16, 2026

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

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Protein complexes in bacteria.

J Harry Caufield1, Marco Abreu1, Christopher Wimble1

  • 1Center for the Study of Biological Complexity, Virginia Commonwealth University, Richmond, Virginia, United States of America.

Plos Computational Biology
|February 28, 2015
PubMed
Summary
This summary is machine-generated.

Protein complex conservation across bacteria is surprisingly low, with less than 10% fully conserved. This study reveals patterns of conservation and identifies potential targets for future research.

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Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies

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Area of Science:

  • Microbiology
  • Systems Biology
  • Bioinformatics

Background:

  • Large-scale analyses of protein complexes in Escherichia coli and Mycoplasma pneumoniae have provided extensive datasets.
  • Integration of mass spectrometry data with curated databases like EcoCyc offers a comprehensive view of protein complex organization.

Purpose of the Study:

  • To investigate the conservation patterns of protein complexes across diverse bacterial species.
  • To identify factors influencing protein complex conservation, including gene orthology, conservation, and essentiality.
  • To pinpoint protein complexes with conserved components and uncharacterized proteins for future experimental validation.

Main Methods:

  • Coupling mass spectrometry data of protein complexes with curated databases (EcoCyc).
  • Comparative analysis using gene orthology, conservation, and essentiality databases across multiple bacterial species (7 model species and 894 genomes).
  • Classification of complex conservation into three models: fully conserved, conserved core, and partial conservation.

Main Results:

  • Less than 10% of Escherichia coli protein complexes are fully conserved across 7 distantly related bacterial species.
  • Protein complex conservation exhibits fractional patterns, with only 14 out of 285 model complexes perfectly conserved across 95% of 894 bacterial genomes.
  • No clear correlation exists between gene essentiality and protein complex conservation; poorly conserved complexes can contain essential proteins.
  • 183 complexes with conserved components and uncharacterized proteins were identified as potential targets for future studies.

Conclusions:

  • Protein complex conservation is limited across bacterial species, challenging assumptions of widespread evolutionary stability.
  • Complex conservation follows distinct models, highlighting the dynamic nature of protein complex evolution.
  • The identification of conserved complexes with uncharacterized proteins provides valuable avenues for future experimental research in bacterial systems biology.