3 hydroxyindolin 2 one monooxygenase

3-hydroxyindolin-2-one monooxygenase (EC 1.14.13.139, BX4 (gene), CYP71C1 (gene)) is an enzyme with systematic name 3-hydroxyindolin-2-one,NAD(P)H:oxygen oxidoreductase (2-hydroxy-2H-1,4-benzoxazin-3(4H)-one-forming). This enzyme catalyses the following chemical reaction

3-hydroxyindolin-2-one + NAD(P)H + H⁺ + O₂ ⇌ 2-hydroxy-2H-1,4-benzoxazin-3(4H)-one + NAD(P)⁺ + H₂O

3-hydroxyindolin-2-one monooxygenase is involved in the biosynthesis of protective and allelophatic benzoxazinoids in some plants.