Phosphoethanolamine N-methyltransferase 1
Hydrogen Ion + L-Serine → Carbon dioxide + Ethanolamine
Adenosine triphosphate + Ethanolamine → Adenosine diphosphate + Hydrogen Ion + O-Phosphoethanolamine
O-Phosphoethanolamine + S-Adenosylmethionine → Hydrogen Ion + N-Methylethanolamine phosphate + S-Adenosylhomocysteine
N-Methylethanolamine phosphate + S-Adenosylmethionine → Hydrogen Ion + N-Dimethylethanolamine phosphate + S-Adenosylhomocysteine
N-Dimethylethanolamine phosphate + S-Adenosylmethionine → Hydrogen Ion + Phosphorylcholine + S-Adenosylhomocysteine
Phosphorylcholine + Water → Choline + Pyrophosphate
Phosphoethanolamine/phosphocholine phosphatase