methyltransferase i catalyzed the methylation of phosphatidylethanolamine to phosphatidyl-n-monomethylethanolamine , had a very low km ( approximately 1.5 microm ) for s-adenosylmethionine , and a ph optimum of 6.5 , and it was stimulated by mg2+ and ca2+ .
C0025831
methyltransferase
C0025723
methylation