3-hydroxyindolin-2-one monooxygenase (, 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
The enzyme is a cytochrome P450 protein containing heme, isolated from maize and other grasses. It requires a partner cytochrome P450 reductase for functional expression. This uses nicotinamide adenine dinucleotide phosphate. It is involved in the biosynthesis of protective and allelopathic compounds such as DIMBOA in some plants.
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