ID 2.1.1.262 DE squalene methyltransferase. CA 2 S-adenosyl-L-methionine + squalene = 3,22-dimethyl-1,2,23,24- CA tetradehydro-2,3,22,23-tetrahydrosqualene + 2 H(+) + 2 S-adenosyl-L- CA homocysteine. CC -!- Two isoforms differing in their specificity were isolated from the CC green alga Botryococcus braunii BOT22. CC -!- TMT-1 gave more of the dimethylated form whereas TMT2 gave more of CC the monomethylated form. DR H2E7T5, SQMT1_BOTBR; H2E7T6, SQMT2_BOTBR; //