(+)-taxifolin 5'-hydroxylase activity
Catalysis of the reaction: (+)-taxifolin(1-) + O2 + NADPH(4-) + H+ = (+)-dihydromyricetin + NADP(3-) + H2O.
GO:0016709
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
is_a