Zeaxanthin epoxidase

Zeaxanthin epoxidase (, Zea-epoxidase) is an enzyme with systematic name zeaxanthin,NAD(P)H:oxygen oxidoreductase. This enzyme catalyses the following chemical reaction


 * zeaxanthin + 2 NAD(P)H + 2 H+ + 2 O2 $$\rightleftharpoons$$ violaxanthin + 2 NAD(P)+ + 2 H2O (overall reaction)
 * (1a) zeaxanthin + NAD(P)H + H+ + O2 $$\rightleftharpoons$$ antheraxanthin + NAD(P)+ + H2O
 * (1b) antheraxanthin + NAD(P)H + H+ + O2 $$\rightleftharpoons$$ violaxanthin + NAD(P)+ + H2O

Zeaxanthin epoxidase is a flavoprotein (FAD) that is active under conditions of low light.