KEGG   ENZYME: 2.1.1.82Help
Entry
EC 2.1.1.82                 Enzyme                                 

Name
3-methylquercetin 7-O-methyltransferase;
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]
Class
Transferases;
Transferring one-carbon groups;
Methyltransferases
BRITE hierarchy
Sysname
S-adenosyl-L-methionine:5,7,3',4'-tetrahydroxy-3-methoxyflavone 7-O-methyltransferase
Reaction(IUBMB)
S-adenosyl-L-methionine + 5,7,3',4'-tetrahydroxy-3-methoxyflavone = S-adenosyl-L-homocysteine + 5,3',4'-trihydroxy-3,7-dimethoxyflavone [RN:R05323]
Reaction(KEGG)
Substrate
S-adenosyl-L-methionine [CPD:C00019];
5,7,3',4'-tetrahydroxy-3-methoxyflavone
Product
S-adenosyl-L-homocysteine [CPD:C00021];
5,3',4'-trihydroxy-3,7-dimethoxyflavone
Comment
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.
History
EC 2.1.1.82 created 1989
Pathway
Flavone and flavonol biosynthesis
Reference
1  [PMID:3994393]
  Authors
De Luca V, Ibrahim RK.
  Title
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.
  Journal
Arch. Biochem. Biophys. 238 (1985) 596-605.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 
CAS: 
97089-67-3

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