Phosphatidyl serine synthase is also known as serine exchange enzyme. This family represents eukaryotic PSS I and II which are membrane bound proteins which catalyses the replacement of the head group of a phospholipid (phosphotidylcholine or phosphotidylethanolamine) by L-serine.

1: Phosphatidylserine synthase I and II of mammalian cells. Kuge O, Nishijima M; Biochim Biophys Acta 1997;1348:151-156. PMID:9370327