has role independent continuant Mycoplasma genitalium metabolite S-adenosyl-L-methionine A sulfonium compound that is the S-adenosyl derivative of L-methionine. It is an intermediate in the metabolic pathway of methionine. S-adenosyl-D-methionine coenzyme sulfonium compound micronutrient nutraceutical S-adenosyl-L-methionine zwitterion S-adenosyl-L-methioninate Saccharomyces cerevisiae metabolite human metabolite