Sphingomyelin (SM) is a major component of plasma membranes. It is preferentially concentrated in the outer leaflet and has a role in the formation of lipid rafts. SM synthases (EC 2.7.8.27), such as SGMS2, produce SM in the lumen of the Golgi and on the cell surface through the transfer of phosphocholine from phosphatidylcholine onto ceramide, yielding diacylglycerol as a side product (Huitema et al., 2004 [PubMed 14685263]).[supplied by OMIM]
