EC - 3-methylquercetin 7-O-methyltransferase

  IntEnz view ENZYME view

IntEnz Enzyme Nomenclature


Accepted name:
3-methylquercetin 7-O-methyltransferase
Other names:
flavonol 7-O-methyltransferase
flavonol 7-methyltransferase
S-adenosyl-L-methionine:3',4',5,7-tetrahydroxy-3-methoxyflavone 7-O-methyltransferase
3-methylquercitin 7-O-methyltransferase [misprint]
Systematic name:
S-adenosyl-L-methionine:5,7,3',4'-tetrahydroxy-3-methoxyflavone 7-O-methyltransferase



Involved with EC quercetin 3-O-methyltransferase and EC 3,7-dimethylquercetin 4'-O-methyltransferase in the methylation of quercetin to 3,7,4'-trimethylquercetin in Chrysosplenium americanum. Does not act on flavones, dihydroflavonols, or their glucosides.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , DIAGRAM , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB
Gene Ontology: GO:0030757
CAS Registry Number: 96477-62-2


  1. De Luca, V. and Ibrahim, R.K.
    Enzymatic synthesis of polymethylated flavonols in Chrysosplenium americanum. I. Partial purification and some properties of S-adenosyl-L-methionine:flavonol 3-, 6-, 7-, and 4'-O-methyltransferases.
    Arch. Biochem. Biophys. 238 : 596-605 (1985). [PMID: 3994393]

[EC created 1989]