Tricin synthase (, ''ROMT-17'', ''ROMT-15'', ''HvOMT1'', ''ZmOMT1'') is an

enzyme An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different mol ...

with

systematic name A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature. A semisystematic name or semitrivi ...

''S-adenosyl-L-methionine:tricetin 3',5'-O-dimethyltransferase''. This enzyme catalyses the following

chemical reaction A chemical reaction is a process that leads to the chemistry, chemical transformation of one set of chemical substances to another. When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an Gibbs free energy, ...

: 2

S-adenosyl-L-methionine ''S''-Adenosyl methionine (SAM), also known under the commercial names of SAMe, SAM-e, or AdoMet, is a common cosubstrate involved in methyl group transfers, transsulfuration, and aminopropylation. Although these anabolic reactions occur throug ...

tricetin Tricetin is a flavone, a type of flavonoid. It is a rare aglycone found in the pollen of members of the Myrtaceae, subfamily Leptospermoideae, such as ''Eucalyptus globulus''. This compound shows anticancer effects on human breast adenocarcinoma MC ...

\rightleftharpoons

2 S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin (overall reaction) :(1a) S-adenosyl-L-methionine + tricetin

\rightleftharpoons

S-adenosyl-L-homocysteine + 3'-O-methyltricetin :(1b) S-adenosyl-L-methionine + 3'-O-methyltricetin

\rightleftharpoons

S-adenosyl-L-homocysteine + 3',5'-O-dimethyltricetin The enzymes from ''

Oryza sativa ''Oryza sativa'', having the common name Asian cultivated rice, is the much more common of the two rice species cultivated as a cereal, the other species being ''Oryza glaberrima, O. glaberrima'', African rice. It was History of rice cultivation ...

'' (ROMT-15 and ROMT-17) catalyses the stepwise

methylation Methylation, in the chemistry, chemical sciences, is the addition of a methyl group on a substrate (chemistry), substrate, or the substitution of an atom (or group) by a methyl group. Methylation is a form of alkylation, with a methyl group replac ...

of tricetin to its 3'-mono- and 3',5'-dimethyl ethers.

References

External links

* {{Portal bar, Biology, border=no EC 2.1.1 Flavones metabolism