AdoMet
S-adenosyl-L-methionine zwitterion is a zwitterionic tautomer of S-adenosyl-L-methionine arising from shift of the proton from the carboxy group to the amino group. It has a role as a cofactor. It is a sulfonium compound and an organic cation. It is a tautomer of a S-adenosyl-L-methionine.