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- W2111322423 abstract "Abstract We have previously identified mutant alleles of genes encoding two Rab proteins, Ypt3 and Ryh1, through a genetic screen using the immunosuppressant drug FK506 in fission yeast. In the same screen, we isolated gdi1-i11, a mutant allele of the essential gdi1+ gene encoding Rab GDP-dissociation inhibitor. In gdi1-i11, a conserved Gly267 was substituted by Asp. The Gdi1G267D protein failed to extract Rabs from membrane and Rabs were depleted from the cytosolic fraction in the gdi1-i11 mutant cells. Consistently, the Gdi1G267D protein was found mostly in the membrane fraction, whereas wild-type Gdi1 was found in both the cytosolic and the membrane fraction. Notably, overexpression of spo20+, encoding a phosphatidylcholine/phosphatidylinositol transfer protein, rescued gdi1-i11 mutation, but not ypt3-i5 or ryh1-i6. The gdi1-i11 and spo20-KC104 mutations are synthetically lethal, and the wild-type Gdi1 failed to extract Rabs from the membrane in the spo20-KC104 mutant. The phosphatidylinositol-transfer activity of Spo20 is dispensable for the suppression of the gdi1-i11 mutation, suggesting that the phosphatidylcholine-transfer activity is important for the suppression. Furthermore, knockout of the pct1+ gene encoding a choline phosphate cytidyltransferase rescued the gdi1-i11 mutation. Together, our findings suggest that Spo20 modulates Gdi1 function via regulation of phospholipid metabolism of the membranes." @default.
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- W2111322423 date "2006-11-01" @default.
- W2111322423 modified "2023-10-18" @default.
- W2111322423 title "Genetic Evidence for Phospholipid-Mediated Regulation of the Rab GDP-Dissociation Inhibitor in Fission Yeast" @default.
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- W2111322423 doi "https://doi.org/10.1534/genetics.106.064709" @default.
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