MetK genes encode methionine adenosyltransferase , which synthesizes S - adenosyl methionine ( SAM ) .
AhcY genes encode S - adenosylhomocysteine hydrolase , which degrade the related metabolite S - Adenosyl - L - homocysteine ( SAH ) .
metK genes encode methionine adenosyltransferase , which synthesizes S - adenosyl methionine ( SAM ) , and ahcY genes encode S - adenosylhomocysteine hydrolase , which degrade the related metabolite S - Adenosyl - L - homocysteine ( SAH ) .