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magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase activity

Known as: Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase activity, Mg-protoporphyrin IX monomethyl ester oxidative cyclase activity, magnesium-protoporphyrin-IX 13-monomethyl ester,NADPH:oxygen oxidoreductase (hydroxylating) 
Catalysis of the reaction: magnesium protoporphyrin IX 13-monomethyl ester + 3 NADPH + 3 H+ + 3 O2 = divinylprotochlorophyllide + 3 NADP+ + 5 H2O… 
National Institutes of Health