KEGG   ENZYME: 2.1.1.175Help
Entry
EC 2.1.1.175                Enzyme                                 

Name
tricin synthase;
ROMT-17;
ROMT-15;
HvOMT1;
ZmOMT1
Class
Transferases;
Transferring one-carbon groups;
Methyltransferases
BRITE hierarchy
Sysname
S-adenosyl-L-methionine:tricetin 3',5'-O-dimethyltransferase
Reaction(IUBMB)
2 S-adenosyl-L-methionine + tricetin = 2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin (overall reaction) [RN:R09611];
(1a) S-adenosyl-L-methionine + tricetin = S-adenosyl-L-homocysteine + 3'-O-methyltricetin [RN:R09612];
(1b) S-adenosyl-L-methionine + 3'-O-methyltricetin = S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin [RN:R09613]
Reaction(KEGG)
Substrate
S-adenosyl-L-methionine [CPD:C00019];
tricetin [CPD:C10192];
3'-O-methyltricetin [CPD:C19739]
Product
S-adenosyl-L-homocysteine [CPD:C00021];
3',5'-O-dimethyltricetin [CPD:C10193];
3'-O-methyltricetin [CPD:C19739]
Comment
The 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 [1]. The enzymes from Hordeum vulgare (HvOMT1) and from Zea mays (ZmOMT1) form the 3',5'-dimethyl derivative as the major product [2].
History
EC 2.1.1.175 created 2010
Reference
1  [PMID:17943312]
  Authors
Lee YJ, Kim BG, Chong Y, Lim Y, Ahn JH
  Title
Cation dependent O-methyltransferases from rice.
  Journal
Planta. 227 (2008) 641-7.
  Sequence
[osa:4345934]
Reference
2
  Authors
Zhou, J.-M., Fukushi, Y., Wollenweber, E., Ibrahim, R.K.
  Title
Characterization of two O-methyltransferase-like genes in barley and maize.
  Journal
Pharm. Biol. 46 (2008) 26-34.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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