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Volume 151, Issue 3

Hypoxia abolishes transience of the heat-shock response in the methylotrophic yeast Free

Abstract

The heat-shock response is conserved amongst practically all organisms. Almost invariably, the massive heat-shock protein (Hsp) synthesis that it induces is subsequently down-regulated, making this a transient, not a sustained, stress response. This study investigated whether the heat-shock response displays any unusual features in the methylotrophic yeast , since this organism exhibits the highest growth temperature (49–50 °C) identified to date for any yeast and grows at 47 °C without either thermal death or detriment to final biomass yield. Maximal levels of Hsp induction were observed with a temperature upshift of from 30 °C to 47–49 °C. This heat shock induces a prolonged growth arrest, heat-shock protein synthesis being down-regulated long before growth resumes at such high temperatures. A 30 °C to 49 °C heat shock also induced thermotolerance, although cells in balanced growth at 49 °C were intrinsically thermotolerant. Unexpectedly, the normal transience of the heat-shock response was suppressed completely by imposing the additional stress of hypoxia at the time of the 30 °C to 49 °C temperature upshift. Hypoxia abolishing the transience of the heat-shock response appears to operate at the level of Hsp gene transcription, since the heat-induced Hsp70 mRNA was transiently induced in a heat-shocked normoxic culture but displayed sustained induction in a culture deprived of oxygen at the time of temperature upshift.

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Keyword(s): HSF, heat-shock transcription factor and Hsp, heat-shock protein
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2005-03-01
2024-04-20
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Hypoxia abolishes transience of the heat-shock response in the methylotrophic yeast Hansenula polymorpha
Microbiology 151, 805 (2005); https://doi.org/10.1099/mic.0.27272-0
/content/journal/micro/10.1099/mic.0.27272-0
/content/journal/micro/10.1099/mic.0.27272-0
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