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• W2080525181 abstract "Phosphatidylserine (PtdSer) in mammalian cells is synthesized through the action of PtdSer synthase (PSS) 1 and 2, which catalyze the conversion of phosphatidylcholine and phosphatidylethanolamine, respectively, to PtdSer. The PtdSer synthesis in intact cells and an isolated membrane fraction is inhibited by exogenous PtdSer, indicating that inhibition of PtdSer synthases by PtdSer is important for the regulation of PtdSer biosynthesis. In this study, to examine whether the inhibition occurs through the direct interaction of PtdSer with the synthases or is mediated by unidentified factor(s), we purified a FLAG and HA peptide-tagged form of Chinese hamster PSS 2 to near homogeneity. The purified enzyme, as well as the crude enzyme in a membrane fraction, was inhibited on the addition of PtdSer to the enzyme assay mixture. In contrast to PtdSer, phosphatidylcholine and phosphatidylethanolamine did not significantly inhibit the purified enzyme. Furthermore, PtdSer-resistant PtdSer synthesis was observed on cell-free assaying of the membrane fraction prepared from a Chinese hamster ovary cell strain whose PtdSer synthesis in vivo is not inhibited by exogenous PtdSer. These results suggested that the interaction of PtdSer with PSS 2 or a very minor protein co-purified with PSS 2 was critical for the regulation of PSS 2 activity in intact cells." @default.
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• W2080525181 date "2003-10-01" @default.
• W2080525181 modified "2023-10-17" @default.
• W2080525181 title "Purification and Characterization of Chinese Hamster Phosphatidylserine Synthase 2" @default.
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• W2080525181 doi "https://doi.org/10.1074/jbc.m307270200" @default.
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