ID 2.1.1.142 DE cycloartenol 24-C-methyltransferase. AN sterol C-methyltransferase. CA cycloartenol + S-adenosyl-L-methionine = cyclolaudenol + H(+) + CA S-adenosyl-L-homocysteine. CC -!- S-Adenosyl-L-methionine methylates the Si face of the 24(25)-double CC bond with elimination of a hydrogen atom from the pro-Z methyl group CC at C-25. //