Tricin synthase (, ROMT-17, ROMT-15, HvOMT1, ZmOMT1) is an enzyme with systematic name S-adenosyl-L-methionine:tricetin 3',5'-O-dimethyltransferase. This enzyme catalyses the following overall chemical reaction
The enzyme adds two methyl groups, in sequence, to the flavone tricetin. The first goes on one of the ortho positions in the ring which has three phenolic oxygens, followed by the other, to give tricin. The methyl groups come from the cofactor, S-adenosyl methionine (SAM), which becomes S-adenosyl-L-homocysteine (SAH). The enzyme was characterised from Oryza sativa (ROMT-15 and ROMT-17).
See also Tricetin 3',4',5'-O-trimethyltransferase, an enzyme from common wheat which converts tricetin sequentially to its tri-ether.
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