quercetin 3-O-methyltransferase activity

Catalysis of the reaction: S-adenosyl-L-methionine + 3,5,7,3',4'-pentahydroxyflavone = S-adenosyl-L-homocysteine + 3-methoxy-5,7,3',4'-tetrahydroxy-flavone.

Source:http://purl.uniprot.org/go/0030755

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Catalysis of the reaction: S-adenosyl-L-methionine + 3,5,7,3',4'-pentahydroxyflavone = S-adenosyl-L-homocysteine + 3-methoxy-5,7,3',4'-tetrahydroxy-flavone.
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S-adenosyl-L-methionine:3,5,7,3',4'-pentahydroxyflavone 3-O-methyltransferase activity, flavonoid 3-methyltransferase activity, flavonol 3-O-methyltransferase activity, quercetin 3-O-methyltransferase activity
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