S-adenosylmethionine decarboxylase proenzyme
Hydrogen Ion + S-Adenosylmethionine → Carbon dioxide + S-Adenosylmethioninamine
Ornithine → Carbon dioxide + Putrescine
S-Adenosylmethioninamine + Spermidine → 5'-Methylthioadenosine + Spermine
Putrescine + S-Adenosylmethioninamine → 5'-Methylthioadenosine + Spermidine
Methionine adenosyltransferase 2 subunit beta
S-adenosylmethionine synthase isoform type-1
Adenosine triphosphate + L-Methionine + Water → Phosphate + Pyrophosphate + S-Adenosylmethionine