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Review
. 2004:44:325-47.
doi: 10.1146/annurev.pharmtox.44.101802.121735.

Protein sulfenic acids in redox signaling

Leslie B Poole  1 , P Andrew Karplus, Al Claiborne
Affiliations
Review

Protein sulfenic acids in redox signaling

Leslie B Poole et al. Annu Rev Pharmacol Toxicol. 2004.

Abstract

Reactive (low pKa) cysteine residues in proteins are critical components in redox signaling. A particularly reactive and versatile reversibly oxidized form of cysteine, the sulfenic acid (Cys-SOH), has important roles as a catalytic center in enzymes and as a sensor of oxidative and nitrosative stress in enzymes and transcriptional regulators. Depending on environment, sometimes the sulfenic acid provides a metastable oxidized form, and other times it is a fleeting intermediate giving rise to more stable disulfide, sulfinic acid, or sulfenyl-amide forms.

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