ExplorEnz: EC 2.1.1.150

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2.1.1.150

Accepted name:

isoflavone 7-O-methyltransferase

Reaction:

S-adenosyl-L-methionine + a 7-hydroxyisoflavone = S-adenosyl-L-homocysteine + a 7-methoxyisoflavone

For diagram of the biosynthesis of formononetin and derivatives, click here and of biochanin A, click here

Systematic name:

S-adenosyl-L-methionine:hydroxyisoflavone 7-O-methyltransferase

Comments:

The enzyme from alfalfa can methylate daidzein, genistein and 6,7,4′-trihydroxyisoflavone but not flavones or flavanones.

Links to other databases:

BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 136111-54-1

References:

1.	Edwards, R. and Dixon, R.A. Isoflavone O-methyltransferase activities in elicitor-treated cell suspension cultures of Medicago sativa. Phytochemistry 30 (1991) 2597–2606.
2.	He, X.Z. and Dixon, R.A. Genetic manipulation of isoflavone 7-O-methyltransferase enhances biosynthesis of 4′-O-methylated isoflavonoid phytoalexins and disease resistance in alfalfa. Plant Cell 12 (2000) 1689–1702. [PMID: 11006341]
3.	He, X.-Z. and Dixon, R.A. Affinity chromatography, substrate/product specificity, and amino acid sequence analysis of an isoflavone O-methyltransferase from alfalfa (Medicago sativa L.). Arch. Biochem. Biophys. 336 (1996) 121–129. [DOI] [PMID: 8951042]
4.	He, X.Z., Reddy, J.T. and Dixon, R.A. Stress responses in alfalfa (Medicago sativa L). XXII. cDNA cloning and characterization of an elicitor-inducible isoflavone 7-O-methyltransferase. Plant Mol. Biol. 36 (1998) 43–54. [PMID: 9484461]
5.	Liu, C.-J. and Dixon, R.A. Elicitor-induced association of isoflavone O-methyltransferase with endomembranes prevents the formation and 7-O-methylation of daidzein during isoflavonoid phytoalexin biosynthesis. Plant Cell 13 (2001) 2643–2658. [DOI] [PMID: 11752378]
6.	Zubieta, C., He, X.-Z., Dixon, R.A. and Noel, J.P. Structures of two natural product methyltransferases reveal the basis for substrate specificity in plant O-methyltransferases. Nat. Struct. Biol. 8 (2001) 271–279. [DOI] [PMID: 11224575]

[EC 2.1.1.150 created 2003]