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IUBMB CommentsThe enzymes from Oryza sativa (ROMT-15 and ROMT-17) catalyses the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers. In contrast with the wheat enzyme (EC 2.1.1.169, tricetin 3',4',5'-O-trimethyltransferase), tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ether derivative . The enzymes from Hordeum vulgare (HvOMT1) and from Zea mays (ZmOMT1) form the 3',5'-dimethyl derivative as the major product .
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2 S-adenosyl-L-methionine + tricetin
2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
S-adenosyl-L-methionine + 3'-O-methyltricetin
S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
S-adenosyl-L-methionine + selgin
S-adenosyl-L-homocysteine + tricin
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S-adenosyl-L-methionine + tricetin
S-adenosyl-L-homocysteine + 3'-O-methyltricetin
S-adenosyl-L-methionine + tricetin
S-adenosyl-L-homocysteine + selgin
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2 S-adenosyl-L-methionine + tricetin
2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
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stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers (major product). The enzyme also catalyzes the 3'-O-methylation of luteolin (EC 2.1.1.42) and the methylation of 5-hydroxyferulic acid and quercetin, prefers tricetin over luteolin
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2 S-adenosyl-L-methionine + tricetin
2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers. In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives. The enzyme also catalyzes the methylation of luteolin, myricetin (formation of the 3',5'-dimethyl ether of myricetin, EC 2.1.1.149) and caffeoyl-CoA. ROMT-15 exhibits similar Kcat/Km values for the four substrates. ROMT-15 can not utilize naringenin, apigenin, or kaempferol. The 2,3-double bond and the O-dihydroxyl group are both required for catalytic activity
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2 S-adenosyl-L-methionine + tricetin
2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers. In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives. The enzyme also catalyzes the methylation of luteolin, myricetin (formation of the 3',5'-dimethyl ether of myricetin, EC 2.1.1.149) and caffeoyl-CoA. ROMT-17 prefers tricetin. ROMT-15 can not utilize naringenin, apigenin, or kaempferol. The 2,3-double bond and the O-dihydroxyl group are both required for catalytic activity
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2 S-adenosyl-L-methionine + tricetin
2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
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the enzyme also catalyzes the 3'-O-methylation of luteolin (EC 2.1.1.42) and the methylation of 5-hydroxyferulic acid and quercetin, prefers tricetin over luteolin
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?
S-adenosyl-L-methionine + 3'-O-methyltricetin
S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
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the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers (major product). In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
S-adenosyl-L-methionine + 3'-O-methyltricetin
S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers. In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
S-adenosyl-L-methionine + 3'-O-methyltricetin
S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
-
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers (major product). In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
S-adenosyl-L-methionine + tricetin
S-adenosyl-L-homocysteine + 3'-O-methyltricetin
-
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers (major product). In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
S-adenosyl-L-methionine + tricetin
S-adenosyl-L-homocysteine + 3'-O-methyltricetin
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers. In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
S-adenosyl-L-methionine + tricetin
S-adenosyl-L-homocysteine + 3'-O-methyltricetin
-
the enzyme catalyzes the stepwise methylation of tricetin to its 3'-mono- and 3',5'-dimethyl ethers (major product). In contrast with the wheat enzyme, tricetin dimethyl ether is not converted to its 3',4',5'-trimethylated ester derivatives
-
-
?
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Lee, Y.; Kim, B.; Chong, Y.; Lim, Y.; Ahn, J.
Cation dependent O-methyltransferases from rice
Planta
227
641-647
2008
Oryza sativa, Oryza sativa (Q9XGP7)
brenda
Zhou, J.-M.; Fukushi, Y.; Wollenweber, E.; Ibrahim, R.K.
Characterization of two O-methyltransferase-like genes in barley and maize
Pharm. Biol.
46
26-34
2008
Hordeum vulgare, Zea mays
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brenda
Shalini, V.; Bhaskar, S.; Kumar, K.S.; Mohanlal, S.; Jayalekshmy, A.; Helen, A.
Molecular mechanisms of anti-inflammatory action of the flavonoid, tricin from Njavara rice (Oryza sativa L.) in human peripheral blood mononuclear cells: possible role in the inflammatory signaling
Int. Immunopharmacol.
14
32-38
2012
Oryza sativa, Oryza sativa njavara
brenda
Lam, P.Y.; Liu, H.; Lo, C.
Completion of tricin biosynthesis pathway in rice: cytochrome P450 75B4 is a unique chrysoeriol 5'-hydroxylase
Plant Physiol.
168
1527-1536
2015
Oryza sativa Japonica Group
brenda