2,7,4'-Trihydroxyisoflavanone 4'-O-methyltransferase (, SAM:2,7,4'-trihydroxyisoflavanone 4'-O-methyltransferase, HI4'OMT, HMM1, MtIOMT5) is an enzyme with systematic name S-adenosyl-L-methionine:2,7,4'-trihydroxyisoflavanone 4'-O-methyltransferase. This enzyme catalyses the following chemical reaction
This is a methylation reaction in which the isoflavanone, 2,4',7-trihydroxyisoflavanone, is converted a specific methyl ether, 2,7-dihydroxy-4'-methoxyisoflavanone. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which becomes S-adenosyl-L-homocysteine (SAH). The enzyme was characterised from the legume, Medicago truncatula.
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