| SMSr-ceramide | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 The cryo-EM structure of human sphingomyelin synthase-related protein in complex with ceramide. PDB 8IJQ | |||||||||
| Identifiers | |||||||||
| EC no. | 2.7.8.27 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
| |||||||||
In enzymology, a sphingomyelin synthase (EC 2.7.8.27) is an enzyme that catalyzes the chemical reaction
- a ceramide + a phosphatidylcholine a sphingomyelin + a 1,2-diacyl-sn-glycerol
or the reaction using phosphatidylethanolamine instead of phosphatidylcholine to generate ceramide phosphoethanolamine (CPE), a sphingomyelin analog rich in invertebrates, such as insects.
Thus, the two substrates of this enzyme are ceramide and phosphatidylcholine, whereas its two products are sphingomyelin and 1,2-diacyl-sn-glycerol.
This enzyme belongs to the family of transferases, specifically those transferring non-standard substituted phosphate groups. The systematic name of this enzyme class is ceramide:phosphatidylcholine cholinephosphotransferase. Other names in common use include SM synthase, SMS1, and SMS2. SM synthase family also includes the enzyme catalyzing CPE synthesis, named SMSr (SMS-related).