EC |
2.1.1.82 |
Accepted name: |
3-methylquercetin 7-O-methyltransferase |
Reaction: |
S-adenosyl-L-methionine + 5,7,3′,4′-tetrahydroxy-3-methoxyflavone = S-adenosyl-L-homocysteine + 5,3′,4′-trihydroxy-3,7-dimethoxyflavone |
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For diagram of the biosynthesis of methylated quercetin derivatives, click here |
Other name(s): |
flavonol 7-O-methyltransferase; flavonol 7-methyltransferase; 7-OMT; S-adenosyl-L-methionine:3′,4′,5,7-tetrahydroxy-3-methoxyflavone 7-O-methyltransferase; 3-methylquercitin 7-O-methyltransferase [mis-spelt] |
Systematic name: |
S-adenosyl-L-methionine:5,7,3′,4′-tetrahydroxy-3-methoxyflavone 7-O-methyltransferase |
Comments: |
Involved with EC 2.1.1.76 quercetin 3-O-methyltransferase and EC 2.1.1.83 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: |
BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 97089-67-3 |
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 (1985) 596–605. [DOI] [PMID: 3994393] |
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[EC 2.1.1.82 created 1989] |
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