ENTRY       EC 2.1.1.83
NAME        3,7-Dimethylquercetin 4'-O-methyltransferase
            Flavonol 4'-O-methyltransferase
CLASS       Transferases
            Transferring one-carbon groups
            Methyltransferases
SYSNAME     S-Adenosyl-L-methionine:3',4',5-trihydroxy-3,7-dimethoxyflavone
            $ 4'-O-methyltransferase
REACTION    S-Adenosyl-L-methionine + 3',4',5-Trihydroxy-3,7-dimethoxyflavone = 
            S-Adenosyl-L-homocysteine + 3',5-Dihydroxy-3,4',7-trimethoxyflavone
SUBSTRATE   S-Adenosyl-L-methionine
            3',4',5-Trihydroxy-3,7-dimethoxyflavone
PRODUCT     S-Adenosyl-L-homocysteine
            3',5-Dihydroxy-3,4',7-trimethoxyflavone
COMMENT     3,7-Dimethylquercetagetin can also act as acceptor.  Involved with
            EC 2.1.1.76 and 2.1.1.82 in the methylation of quercitin to
            3,7,4'-trimethylquercitin in Chrysosplenium americanum.  Does not
            act on flavones, dihydroflavonols, or their glucosides.
DBLINKS     University of Geneva ENZYME DATA BANK: 2.1.1.83
            WIT (What Is There) Metabolic Reconstruction: 2.1.1.83
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