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Quantifying changes in the bacterial thiol redox proteome during host-pathogen interaction.

Kaibo Xie1, Christina Bunse2, Katrin Marcus2

  • 1Ruhr University Bochum, Institute of Biochemistry and Pathobiochemistry, Microbial Biochemistry, 44780 Bochum, Germany.

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|January 26, 2019
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Summary
This summary is machine-generated.

Host immune cells generate oxidants to kill microbes. This study reveals that during phagocytosis, most proteins in Escherichia coli experience significant thiol oxidation, impacting bacterial defense and metabolism.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Immunology

Background:

  • Phagocytes produce oxidants as a key host defense mechanism against microbial pathogens.
  • Oxidation of protein thiol groups (cysteine residues) is a critical regulatory post-translational modification.
  • Bacteria utilize thiol oxidation to manage and adapt to oxidative stress.

Purpose of the Study:

  • To investigate the in vivo thiol oxidation status of Escherichia coli (E. coli) within phagocytes.
  • To understand the impact of the phagolysosomal oxidative environment on bacterial proteins.

Main Methods:

  • Utilized a quantitative redox proteomic approach, specifically the Oxidation-Inclusion/Cysteine-Array Technology (OxICAT) method.
  • Assessed the in vivo thiol oxidation state of E. coli after phagocytosis.

Main Results:

  • A significant majority (65.5%) of identified proteins in phagocytized E. coli exhibited substantial thiol oxidation (>30%).
  • Oxidized proteins were predominantly involved in core metabolic pathways, cell detoxification, and stress response, indicating widespread cysteine proteome damage.
  • 16 oxidized proteins conferred a growth advantage to E. coli in the presence of hydrogen peroxide (H₂O₂), and 11 were essential under these conditions.

Conclusions:

  • Phagocytosis induces extensive thiol oxidation in E. coli, disrupting essential cellular functions.
  • Specific oxidized proteins play crucial roles in bacterial survival and adaptation to oxidative stress within the host environment.
  • Understanding these redox modifications is vital for developing novel antimicrobial strategies targeting bacterial stress responses.