3-Epi-6-deoxocathasterone 23-monooxygenase (, cytochrome P450 90C1, CYP90D1, CYP90C1) is an enzyme with systematic name 3-epi-6-deoxocathasterone,NADPH:oxygen oxidoreductase (C-23-hydroxylating). This enzyme catalyses the following chemical reaction
The enzyme can insert a hydroxy group into other similar compounds, for example to give 3-dehydro-6-deoxoteasterone. It is a cytochrome P450 protein containing heme, isolated from Arabidopsis thaliana, and requires a partner cytochrome P450 reductase for functional expression. This uses nicotinamide adenine dinucleotide phosphate. 3-Epi-6-deoxocathasterone 23-monooxygenase takes part in brassinosteroid biosynthesis.
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