Magnesium-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.