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. 1990 Aug;172(8):4352–4358. doi: 10.1128/jb.172.8.4352-4358.1990

Thermotolerance is independent of induction of the full spectrum of heat shock proteins and of cell cycle blockage in the yeast Saccharomyces cerevisiae.

C A Barnes 1, G C Johnston 1, R A Singer 1
PMCID: PMC213261  PMID: 2198254

Abstract

Cells of the yeast Saccharomyces cerevisiae are known to acquire thermotolerance in response to the stresses of starvation or heat shock. We show here through the use of cell cycle inhibitors that blockage of yeast cells in the G1, S, or G2 phases of the mitotic cell cycle is not a stress that induces thermotolerance; arrested cells remained as sensitive to thermal killing as proliferating cells. These G1- or S-phase-arrested cells were unimpaired in the acquisition of thermotolerance when subjected to a mild heat shock by incubation at 37 degrees C. One cell cycle inhibitor, o-phenanthroline, did in fact cause cells to become thermotolerant but without induction of the characteristic pattern of heat shock proteins. Thermal induction of heat shock protein synthesis was unaffected; the o-phenanthroline-treated cells could still synthesize heat shock proteins upon transfer to 37 degrees C. Use of a novel mutant conditionally defective only for the resumption of proliferation from stationary phase (M. A. Drebot, G. C. Johnston, and R. A. Singer, Proc. Natl. Acad. Sci. USA 84:7948-7952, 1987) indicated that o-phenanthroline inhibition produces a stationary-phase arrest, a finding which is consistent with the increased thermotolerance and regulated cessation of proliferation exhibited by the inhibited cells. These findings show that the acquired thermotolerance of cells is unrelated to blockage of the mitotic cell cycle or to the rapid synthesis of the characteristic spectrum of heat shock proteins.

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Selected References

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