Transferases are a collection of a large and diverse group of enzymes that specifically catalyze the transfer of one or more functional groups from one molecule (the donor) to another (the acceptor). A few transferases involved in this category include farnesyltransferase (FTase), diacylglycerol acyltransferase (DGAT) and catechol-O-methyltransferase (COMT). Ftase catalyzes the transfer of a farnesyl moiety to the cysteine terminal residue (the sulfhydryl cysteine of the CAAS motif)) of substrate proteins. DGAT catalyzes the final step of the triacylglycerol (TG) biosynthetic pathway, where diacylglycerol is esterified to produce TG. COMT catalyzes the methylation of catechol substrates utilizing S-adenosyl-L-methionine (SAM) as a methyl donor and generating O-methylated catechol and S-adenosyl-L-homocysteine.