ID   2.1.1.398
DE   isoflavone 3'-O-methyltransferase.
CA   a 3'-hydroxyisoflavone + S-adenosyl-L-methionine = a 3'-methoxyisoflavone
CA   + S-adenosyl-L-homocysteine + H(+).
CC   -!- The enzyme catalyzes a step in the biosynthesis of
CC       3'-methoxypuerarin, an isoflavone with bioactive properties isolated
CC       from the roots of the leguminous plant Pueraria lobata var.
CC       leguminosa.
CC   -!- The highest activity has been found for 3'-hydroxydaidzein. The
CC       enzyme has low activity on the 3'-hydroxyflavones luteolin and
CC       quercetin.
CC   -!- 3'-hydroxypuerarin is not a substrate.
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