Tricetin_3',4',5'-O-trimethyltransferase
Tricetin 3',4',5'-O-trimethyltransferase (EC 2.1.1.169, FOMT, TaOMT1, TaCOMT1, TaOMT2) is an enzyme with systematic name S-adenosyl-L-methionine:tricetin 3',4',5'-O-trimethyltransferase.[1][2][3] This enzyme catalyses the following chemical reaction
- 3 S-adenosyl-L-methionine + tricetin 3 S-adenosyl-L-homocysteine + 3',4',5'-O-trimethyltricetin (overall reaction)
- (1a) S-adenosyl-L-methionine + tricetin S-adenosyl-L-homocysteine + 3'-O-methyltricetin
- (1b) S-adenosyl-L-methionine + 3'-O-methyltricetin S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin
- (1c) S-adenosyl-L-methionine + 3',5'-O-dimethyltricetin S-adenosyl-L-homocysteine + 3',4',5'-O-trimethyltricetin
The enzyme from Triticum aestivum catalyses the sequential O-methylation of tricetin via 3'-O-methyltricetin, 3',5'-O-methyltricetin to 3',4',5'-O-trimethyltricetin.