PTDSS2
Function
Catalyzes a base-exchange reaction in which the polar head group of phosphatidylethanolamine (PE) or phosphatidylcholine (PC) is replaced by L-serine (PubMed:19014349). Catalyzes the conversion of phosphatatidylethanolamine and does not act on phosphatidylcholine (PubMed:19014349). Can utilize both phosphatidylethanolamine (PE) plasmalogen and diacyl PE as substrate and the latter is six times better utilized, indicating the importance of an ester linkage at the sn-1 position (By similarity). Although it shows no sn-1 fatty acyl preference, exhibits significant preference towards docosahexaenoic acid (22:6n-3) compared with 18:1 or 20:4 at the sn-2 position (By similarity).
Pathway
Phospholipid metabolism; phosphatidylserine biosynthesis.
Sequence Similarities
Belongs to the phosphatidyl serine synthase family.
Cellular localization
- Endoplasmic reticulum membrane
- Multi-pass membrane protein
- Highly enriched in the mitochondria-associated membrane (MAM).
Alternative names
PSS2, PTDSS2, Phosphatidylserine synthase 2, PSS-2, PtdSer synthase 2, Serine-exchange enzyme II