Violaxanthin de-epoxidase

Template:Infobox enzyme Violaxanthin de-epoxidase (Template:EC number, VDE) is an enzyme with systematic name violaxanthin:ascorbate oxidoreductase. This enzyme catalyses the following chemical reaction

violaxanthin + 2 L-ascorbate $\rightleftharpoons$ zeaxanthin + 2 L-dehydroascorbate + 2 H₂O (overall reaction)

(1a) violaxanthin + L-ascorbate $\rightleftharpoons$ antheraxanthin + L-dehydroascorbate + H₂O

(1b) antheraxanthin + L-ascorbate $\rightleftharpoons$ 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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