24-methylenesterol C-methyltransferase () is an enzyme that catalyzes the chemical reaction
This is a methylation reaction in which the phytosterol, 24-methylenelophenol, is converted to citrostadienol. The methyl group comes from the cofactor, S-adenosyl methionine (SAM), which becomes S-adenosyl-L-homocysteine (SAH). The enzyme was characterised from Nicotiana tabacum.
This enzyme belongs to the family of transferases, specifically those transferring one-carbon group methyltransferases. The systematic name of this enzyme class is S-adenosyl-L-methionine:24-methylenelophenol C-methyltransferase. Other names in common use include SMT2, and 24-methylenelophenol C-241-methyltransferase.
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