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- W2171878310 abstract "Yeast members of the ORMDL family of endoplasmic reticulum (ER) membrane proteins play a central role in lipid homeostasis and protein quality control. In the absence of yeast Orm1 and Orm2, accumulation of long chain base, a sphingolipid precursor, suggests dysregulation of sphingolipid synthesis. Physical interaction between Orm1 and Orm2 and serine palmitoyltransferase, responsible for the first committed step in sphingolipid synthesis, further supports a role for the Orm proteins in regulating sphingolipid synthesis. Phospholipid homeostasis is also affected in orm1Delta orm2Delta cells: the cells are inositol auxotrophs with impaired transcriptional regulation of genes encoding phospholipid biosynthesis enzymes. Strikingly, impaired growth of orm1Delta orm2Delta cells is associated with constitutive unfolded protein response, sensitivity to stress, and slow ER-to-Golgi transport. Inhibition of sphingolipid synthesis suppresses orm1Delta orm2Delta phenotypes, including ER stress, suggesting that disrupted sphingolipid homeostasis accounts for pleiotropic phenotypes. Thus, the yeast Orm proteins control membrane biogenesis by coordinating lipid homeostasis with protein quality control." @default.
- W2171878310 created "2016-06-24" @default.
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- W2171878310 date "2010-03-08" @default.
- W2171878310 modified "2023-10-16" @default.
- W2171878310 title "Orm1 and Orm2 are conserved endoplasmic reticulum membrane proteins regulating lipid homeostasis and protein quality control" @default.
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- W2171878310 doi "https://doi.org/10.1073/pnas.0911617107" @default.
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