S-Adenosylmethionine + Phosphatidyl-N-methylethanolamine → S-Adenosylhomocysteine + Phosphatidyl-N-dimethylethanolamine
Thumb+Phosphatidyl-N-methylethanolamine→Thumb+Phosphatidyl-N-dimethylethanolamine

Enzymes

  1. Phosphatidylethanolamine N-methyltransferase