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HSP104 required for induced thermotolerance.

Y Sanchez1, S L Lindquist

  • 1Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, Illinois 60637.

Science (New York, N.Y.)
|June 1, 1990
PubMed
Summary

Heat shock protein 104 (HSP104) is crucial for yeast cells to develop heat tolerance after mild pre-treatment. Without functional HSP104, yeast cells cannot survive extreme temperatures, highlighting its vital role in cellular thermotolerance.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Heat shock proteins (HSPs) are essential for cellular survival under stress.
  • The specific role of HSP104 in acquired thermotolerance in Saccharomyces cerevisiae was not fully understood.

Purpose of the Study:

  • To investigate the function of the heat shock protein gene, HSP104, in yeast.
  • To determine the role of HSP104 in acquired heat tolerance.

Main Methods:

  • Isolation of the HSP104 gene from Saccharomyces cerevisiae.
  • Introduction of a deletion mutation in the HSP104 gene.
  • Assessment of cell growth, survival rates under heat stress, and acquired thermotolerance after pre-treatment.
  • Complementation of the mutant phenotype by transformation with the wild-type HSP104 gene.

Main Results:

  • Mutant yeast cells lacking HSP104 showed normal growth and survival under direct high-temperature exposure.
  • Mutant cells failed to acquire thermotolerance following a mild pre-heat treatment.
  • Wild-type yeast cells successfully acquired thermotolerance after mild pre-heat treatment.
  • Transformation with the wild-type HSP104 gene restored the thermotolerance defect in mutant cells.

Conclusions:

  • The heat shock protein HSP104 plays a critical role in the acquisition of thermotolerance in Saccharomyces cerevisiae.
  • HSP104 is essential for yeast cell survival at extreme temperatures, particularly after acclimation.
  • This study elucidates a key mechanism of cellular adaptation to thermal stress.

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