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The redox switch: dynamic regulation of protein function by cysteine modifications
Davide Spadaro1, Byung-Wook Yun, Steven H Spoel
1School of Biological Sciences, Institute of Molecular Plant Sciences, University of Edinburgh, Edinburgh EH9 3JR, UK.
Reactive oxygen and nitrogen intermediates act as crucial signaling molecules, regulating protein function through cysteine modifications. These redox switches are vital for physiological processes across all life forms.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Reactive oxygen intermediates (ROIs) and reactive nitrogen intermediates (RNIs) are established signaling molecules in microorganisms, mammals, and plants.
- These molecules are synthesized by NADPH-dependent enzymes, regulating redox signaling pathways.
- Mild oxidants like hydrogen peroxide and nitric oxide mediate signaling via protein modifications.
Purpose of the Study:
- To elucidate the role of cysteine residues in redox signaling.
- To detail the various post-translational modifications mediated by ROIs and RNIs.
- To highlight the regulatory function of Cys-based redox switches in physiological processes.
Main Methods:
- Analysis of protein oxidation and modification.
- Identification of cysteine residue targets.
- Characterization of redox-based post-translational modifications.
Main Results:
- Cysteine residues, particularly those with low pKa, are primary targets for ROIs and RNIs.
- Specific modifications include S-nitrosylation, S-glutathionylation, and formation of sulphenic, sulphinic acids, and disulfides.
- These modifications precisely regulate protein structure and function.
Conclusions:
- Cysteine-based redox switches are fundamental to diverse signaling systems.
- These switches regulate critical physiological outputs across all kingdoms of life.
- Understanding these mechanisms is key to comprehending cellular regulation.
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