Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen
1.14.13 With NADH or NADPH as one donor, and incorporation of one atom of oxygen into the other donor
1.14.13.81
R06265 Magnesium protoporphyrin monomethyl ester + NADPH + H+ + Oxygen <=> 13(1)-Hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester + NADP+ + H2O