Catalysis of the reaction: L-kynurenine + H(+) + NADPH + O(2) = 3-hydroxy-L-kynurenine + H(2)O + NADP(+).
Taxonomy/Path:
GO : oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, NAD(P)H as one donor, and incorporation of one atom of oxygen / kynurenine 3-monooxygenase activity