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Cysteine-based redox switches in enzymes.
Chananat Klomsiri1, P Andrew Karplus, Leslie B Poole
1Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.
Enzymes are regulated by posttranslational modifications, including redox modifications of cysteine residues. These redox events are integral to cell signaling and often work with phosphorylation, with peroxiredoxins playing key roles.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Enzymes are regulated by posttranslational modifications (PTMs).
- Phosphorylation/dephosphorylation is a well-known PTM.
- Redox modifications of cysteine residues are emerging as critical regulatory mechanisms.
Purpose of the Study:
- To review the chemical, structural, and regulatory aspects of enzyme redox modification.
- To discuss the interplay between redox modifications and phosphorylation in cell signaling.
- To highlight the role of peroxiredoxins in antioxidant defense and cell signaling.
Main Methods:
- Literature review of chemical and structural properties of redox-modified cysteines.
- Analysis of regulatory mechanisms involving cysteine redox states.
- Examination of signaling pathways where redox modifications are integrated with phosphorylation.
Main Results:
- Redox modifications of cysteine residues offer versatile enzymatic regulation.
- Redox regulation often works in concert with phosphorylation, influencing enzyme activity, turnover, and localization.
- Peroxiredoxins are identified as key players in both antioxidant defense and cell signaling.
Conclusions:
- Redox dependence is an integral component of many cell signaling processes.
- Understanding cysteine redox modifications is crucial for comprehending enzyme regulation and cell function.
- Peroxiredoxins represent a significant focus for future research in redox biology and signaling.
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