EC 2.1.1.83 - 3,7-dimethylquercetin 4'-O-methyltransferase

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IntEnz Enzyme Nomenclature
EC 2.1.1.83

Names

Accepted name:
3,7-dimethylquercetin 4'-O-methyltransferase
Other names:
4'-OMT
flavonol 4'-O-methyltransferase
flavonol 4'-methyltransferase
S-adenosyl-L-methionine:3',4',5-trihydroxy-3,7-dimethoxyflavone 4'-O-methyltransferase
3,7-dimethylquercitin 4'-O-methyltransferase [misprint]
Systematic name:
S-adenosyl-L-methionine:5,3',4'-trihydroxy-3,7-dimethoxyflavone 4'-O-methyltransferase

Reaction

Comments:

3,7-Dimethylquercetagetin can also act as acceptor. Involved with EC 2.1.1.76 quercetin 3-O-methyltransferase and EC 2.1.1.82 3-methylquercetin 7-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:0030758
CAS Registry Number: 96477-60-0

References

  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]
  2. De Luca, V. and Ibrahim, R.K.
    Enzymatic synthesis of polymethylated flavonols in Chrysosplenium americanum. II. Substrate interaction and product inhibition studies of flavonol 3-, 6-, and 4'-O-methyltransferases.
    Arch. Biochem. Biophys. 238: 606-618 (1985). [PMID: 3994394]

[EC 2.1.1.83 created 1989]