Violaxanthin de-epoxidase (, VDE) is an enzyme with systematic name violaxanthin:ascorbate oxidoreductase. This enzyme catalyses the following chemical reaction
violaxanthin + 2 L-ascorbate zeaxanthin + 2 L-dehydroascorbate + 2 H2O (overall reaction) (1a) violaxanthin + L-ascorbate antheraxanthin + L-dehydroascorbate + H2O (1b) antheraxanthin + L-ascorbate zeaxanthin + L-dehydroascorbate + H2O
Violaxanthin de-epoxidase is a part of the xanthophyll (or violaxanthin) cycle for controlling the concentration of zeaxanthin in chloroplasts.
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