Phosphatidylserine synthase I and II of mammalian cells
- PMID: 9370327
- DOI: 10.1016/s0005-2760(97)00137-9
Phosphatidylserine synthase I and II of mammalian cells
Abstract
Phosphatidylserine (PtdSer) in mammalian cells is synthesized through an exchange of free L-serine for the base moiety of pre-existing phospholipids. Studies on PtdSer biosynthesis in Chinese hamster ovary (CHO) cells have suggested that the serine base-exchange is catalyzed by at least two different enzymes; one, named PtdSer synthase I (PSS I), uses phosphatidylcholine (PtdCho) and possibly phosphatidylethanolamine (PtdEtn) as phosphatidyl donors for the serine base-exchange, and the other, named PtdSer synthase II (PSS II), uses PtdEtn but not PtdCho as a phosphatidyl donor. Recently, cDNAs of the PSS I and II have been isolated from CHO-K1 cells. This review will briefly describe the current understanding of PtdSer synthases of mammalian cells, mainly CHO cells.
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