Suppressor gene analysis reveals an essential role for sphingolipids in transport of glycosylphosphatidylinositol-anchored proteins in Saccharomyces cerevisiae
10.1128/jb.179.5.1513-1520.1997
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

Sphingolipids are normally necessary for growth of Saccharomyces cerevisiae cells, but mutant strains that bypass the need for sphingolipids have been identified. Such bypass mutants fail to grow under stressful conditions, including low pH (pH 4.1), when they lack sphingolipids. To begin to understand why sphingolipids seem to be necessary for coping with low-pH stress, we screened a genomic library and selected a suppressor gene, CWP2 (cell wall protein 2), that when present in multiple copies partially compensates for the lack of sphingolipids and enhances survival at low pH. To explain these results, we present evidence that sphingolipids are required for a normal rate of transport of glycosylphosphatidylinositol (GPI)-anchored proteins, including Cwp2 and Gas1/Gpg1, from the endoplasmic reticulum (ER) to the Golgi apparatus. The effect of sphingolipids is specific for transport of GPI-anchored proteins because no effect on the rate of transport of carboxypeptidase Y, a non-GPI-anchored protein, was observed. Since the Gasl protein accumulated in the ER with a GPI anchor in cells lacking sphingolipids, we conclude that sphingolipids are not necessary for anchor attachment. Therefore, sphingolipids must be necessary for a step in formation of COPII vesicles or for their transport to the Golgi apparatus. Our data identify the Cwp2 protein as a vital component in protecting cells from the stress of low pH.

Bibliography

Skrzypek, M., Lester, R. L., & Dickson, R. C. (1997). Suppressor gene analysis reveals an essential role for sphingolipids in transport of glycosylphosphatidylinositol-anchored proteins in Saccharomyces cerevisiae. Journal of Bacteriology, 179(5), 1513–1520.

Authors 3
  1. M Skrzypek (first)
  2. R L Lester (additional)
  3. R C Dickson (additional)
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Dates
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Created 8 years, 9 months ago (Nov. 10, 2016, 11:17 a.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 2:08 p.m.)
Indexed 1 year, 8 months ago (Dec. 22, 2023, 12:23 a.m.)
Issued 28 years, 6 months ago (March 1, 1997)
Published 28 years, 6 months ago (March 1, 1997)
Published Print 28 years, 6 months ago (March 1, 1997)
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@article{Skrzypek_1997, title={Suppressor gene analysis reveals an essential role for sphingolipids in transport of glycosylphosphatidylinositol-anchored proteins in Saccharomyces cerevisiae}, volume={179}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.179.5.1513-1520.1997}, DOI={10.1128/jb.179.5.1513-1520.1997}, number={5}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Skrzypek, M and Lester, R L and Dickson, R C}, year={1997}, month=mar, pages={1513–1520} }