Protein Disulfide Exchange Reaction

The protein disulfide exchange reaction is a fundamental biochemical process involving the formation, breakage, and rearrangement of disulfide bonds within or between proteins. This reaction is central to protein folding, stability, and function. The core mechanism involves a nucleophilic substitution where a deprotonated thiol group attacks one sulfur atom of an existing disulfide bond. This process is critical for ensuring correct protein structure and regulating protein activity, especially in oxidizing environments like the endoplasmic reticulum and extracellular space.

Other names

Thiol-disulfide exchangeDisulfide bond rearrangementRedox protein folding

Nucleophilic attack by a thiolate anion on a disulfide bond, resulting in bond cleavage and formation of a new disulfide bond. Catalyzed by enzymes like Protein Disulfide Isomerases (PDIs) which utilize active-site cysteines to facilitate the exchange.