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Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation
Published on: June 21, 2021
Thiol-based redox switches in the major pathogen Staphylococcus aureus.
Nico Linzner1, Vu Van Loi1, Verena Nadin Fritsch1
1Freie Universität Berlin, Institute of Biology-Microbiology, Königin-Luise-Straße 12-16, D-14195Berlin, Germany.
Staphylococcus aureus uses thiol switches and bacillithiol (BSH) to combat host defenses and antibiotics. These systems offer potential as novel drug targets against multi-drug resistant strains.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Staphylococcus aureus is a significant human pathogen.
- It encounters various reactive species (ROS, RNS, RCS, RES, RSS) from the host immune system, metabolism, and antibiotics.
- S. aureus possesses redox-sensing regulators with thiol switches for defense.
Purpose of the Study:
- To review thiol-based redox sensors and detoxification systems in S. aureus.
- To highlight the role of bacillithiol (BSH) and its pathway in maintaining redox balance.
- To explore the potential of these thiol switches as drug targets.
Main Methods:
- Overview of thiol-based redox sensors and detoxification pathways.
- Investigation of BSH-related regulatory mechanisms.
- Application of the Brx-roGFP2 biosensor to assess BSH redox potential.
Main Results:
- Thiol switches and the BSH pathway are crucial for S. aureus survival under redox stress.
- The Brx-roGFP2 biosensor provided new insights into BSH redox potential.
- These systems confer protection against disinfectants and antimicrobials like HOCl, AGXX®, allicin, and lapachol.
Conclusions:
- Thiol switches in S. aureus are vital for defense against redox-active species and antimicrobials.
- These mechanisms are essential for bacterial survival during infection.
- Targeting thiol switches presents a promising strategy for developing new therapies against multi-drug resistant S. aureus.
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