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Osmostress-induced changes in yeast gene expression.

J C Varela1, C van Beekvelt, R J Planta

  • 1Department of Biochemistry and Molecular Biology, Vrije Universiteit, Amsterdam, The Netherlands.

Molecular Microbiology
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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Saccharomyces cerevisiae cells develop salt tolerance after NaCl exposure, not heat shock. This involves synthesizing specific proteins, including heat-shock proteins, and inducing glycerol-3-phosphate dehydrogenase gene expression.

Area of Science:

  • Cellular biology
  • Biochemistry
  • Yeast genetics

Background:

  • High salt concentrations (NaCl) negatively impact Saccharomyces cerevisiae viability, methionine uptake, and protein biosynthesis.
  • Acquired tolerance to severe salt shock can be achieved through prior exposure to moderate salt levels.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying salt tolerance acquisition in Saccharomyces cerevisiae.
  • To identify specific proteins and gene expression changes associated with salt stress adaptation.

Main Methods:

  • Exposure of yeast cells to varying NaCl concentrations (0.7 M and 1.4 M) and heat shock.
  • Two-dimensional gel electrophoresis of [3H]-leucine labeled proteins to analyze protein synthesis rates.
  • Northern blot analysis using gene-specific probes to assess gene expression.

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Main Results:

  • Previous treatment with 0.7 M NaCl confers tolerance to severe salt shock (1.4 M NaCl), unlike heat shock.
  • Salt shock induces the synthesis of nine specific proteins, including heat-shock proteins hsp12 and hsp26.
  • Gene expression of glycerol-3-phosphate dehydrogenase is induced, and similar protein synthesis patterns are observed with sucrose exposure.

Conclusions:

  • Saccharomyces cerevisiae can adapt to osmotic stress through a specific molecular response involving protein synthesis and gene regulation.
  • The identified heat-shock proteins and glycerol-3-phosphate dehydrogenase play a role in yeast salt tolerance mechanisms.
  • Osmotic stress response in yeast is partially conserved between NaCl and sucrose treatments.