label: quercetin 3-O-methyltransferase activity
label_lc: quercetin 3-o-methyltransferase activity
description: "Catalysis of the reaction: S-adenosyl-L-methionine + 3,5,7,3',4'-pentahydroxyflavone = S-adenosyl-L-homocysteine + 3-methoxy-5,7,3',4'-tetrahydroxy-flavone."