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Growth condition-dependent cell surface proteome analysis of Enterococcus faecium.

Jan C Sinnige1, Mark de Been1, Miaomiao Zhou2,3

  • 1Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands.

Proteomics
|August 29, 2015
PubMed
Summary

This study explored the surface proteins of Enterococcus faecium, a significant hospital pathogen, under various growth conditions. Researchers identified key proteins that change based on the environment, offering potential therapeutic targets.

Keywords:
Enterococcus faeciumGrowthMSMicrobiologyShavingSurfacome

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Area of Science:

  • Microbiology
  • Proteomics
  • Infectious Diseases

Background:

  • Enterococcus faecium has emerged as a critical nosocomial pathogen globally over the past 30 years.
  • Understanding its adaptive mechanisms is crucial for combating multi-drug resistant strains.

Purpose of the Study:

  • To investigate the cell surface proteome of Enterococcus faecium under different laboratory and clinically relevant growth conditions.
  • To identify differentially expressed surface proteins that may indicate adaptive strategies.

Main Methods:

  • Enterococcus faecium E1162 was cultured in Brain Heart Infusion medium (with/without bile salts), Tryptic Soy Broth with glucose, and urine.
  • Cell surface proteins were analyzed using immobilized trypsin "shaving" followed by MS/MS peptide identification.
  • Proteins were mapped against the E1162 whole genome sequence.

Main Results:

  • 67 proteins showed differential detection across various growth conditions.
  • Urine culture resulted in 14 proteins with significantly higher abundance and 9 with lower abundance compared to other conditions.
  • Specific proteins were uniquely identified in BHI-bile and Tryptic Soy Broth with glucose conditions.

Conclusions:

  • Proteolytic shaving effectively identified condition-specific surface proteins in Enterococcus faecium.
  • These differentially expressed proteins are valuable for understanding pathogen adaptation.
  • Identified proteins represent potential targets for developing novel therapeutics against this multi-resistant pathogen.