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• W2017754921 abstract "The essential role for phosphatidylinositol-4-phosphate (PtdIns(4)P) in vesicle-mediated protein transport from the trans-Golgi network (TGN) was first described in the budding yeast Saccharomyces cerevisiae. However, the identity of downstream effectors of PtdIns(4)P in this system has been elusive. Here, we show that Drs2p, a type IV P-type ATPase required for phospholipid translocase (flippase) activity and transport vesicle budding from the TGN, is an effector of PtdIns(4)P. Drs2p-dependent flip of a fluorescent phosphatidylserine analogue across purified TGN membranes requires synthesis of PtdIns(4)P by the phosphatidylinositol-4-kinase (PI(4)K) Pik1p. PtdIns(4)P binds to a regulatory domain in the C-terminal tail of Drs2p that has homology to a split PH domain and is required for Drs2p activity. In addition, basic residues required for phosphoinositide binding overlap a previously mapped binding site for the ArfGEF Gea2p. ArfGEF binding to this C-terminal domain also stimulates flippase activity in TGN membrane preparations. These interactions suggest the presence of a coincidence detection system used to activate phospholipid translocation at sites of vesicle formation." @default.
• W2017754921 created "2016-06-24" @default.
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• W2017754921 creator A5047717868 @default.
• W2017754921 creator A5060117613 @default.
• W2017754921 date "2009-11-08" @default.
• W2017754921 modified "2023-09-30" @default.
• W2017754921 title "Regulation of a Golgi flippase by phosphoinositides and an ArfGEF" @default.
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• W2017754921 doi "https://doi.org/10.1038/ncb1989" @default.
• W2017754921 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2787759" @default.
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