( a ) transfer of its methyl group to a variety of methyl acceptors , ( b ) decarboxylation followed by aminopropylation leading to polyamine synthesis , and ( c ) cleavage of the bond between the sulfur atom and carbon 4 of the amino acid chain , resulting in formation of methylthioadenosine and homoserine thiolactone .
C0002520
amino acid
C0019892
homoserine