Phosphatidylserine synthase I and II of mammalian cells.
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.
Kuge
O
O
Department of Biochemistry and Cell Biology, National Institute of Infectious Diseases, Tokyo, Japan.
Nishijima
M
M
D000595:Amino Acid Sequence; D000818:Animals; D016466:CHO Cells; D003001:Cloning, Molecular; D006224:Cricetinae; D007527:Isoenzymes / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D019884:Nitrogenous Group Transferases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011487:Protein Conformation; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
D007527:Isoenzymes; D019884:Nitrogenous Group Transferases; C111493:Ptdss2 protein, mouse; C022370:phospholipid serine base exchange enzyme