ENTRY       EC 2.1.1.76
NAME        Quercetin 3-O-methyltransferase
            Flavonol 3-O-methyltransferase
CLASS       Transferases
            Transferring one-carbon groups
            Methyltransferases
SYSNAME     S-Adenosyl-L-methionine:3,5,7,3',4'-pentahydroxyfavone
            $ 3-O-methyltransferase
REACTION    S-Adenosyl-L-methionine + 3,5,7,3',4'-Pentahydroxyflavone =
            S-Adenosyl-L-homocysteine +
            3-Methoxy-5,7,3',4'-tetrahydroxyflavone
SUBSTRATE   S-Adenosyl-L-methionine
            3,5,7,3',4'-Pentahydroxyflavone
PRODUCT     S-Adenosyl-L-homocysteine
            3-Methoxy-5,7,3',4'-tetrahydroxyflavone
COMMENT     Specific for quercetin.  Related enzymes bring about the
            3-O-methylation of other flavonols, such as galangin and
            kaempferol.
PATHWAY     PATH: MAP00940  Biosynthesis of flavonoids
DBLINKS     University of Geneva ENZYME DATA BANK: 2.1.1.76
            WIT (What Is There) Metabolic Reconstruction: 2.1.1.76
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