The heat shock response in meso- and thermoacidophilic chemolithotrophic bacteria |
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Authors: | Carlos A. Jerez |
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Affiliation: | Departamento de Bioquimica, Facultad de Medicina, Universidad de Chile, Santiago, Chile |
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Abstract: | Abstract The heat shock response was studied in a chemolithotrophic thermoacidophilic archaebacterium Sulfolobus acidocaldarius (shifted from 70° to 85°C) and a mesoacidop0ilic microorganism Thiobacillus ferrooxidans (from 30° to 41°C). When transferred from their normal growth temperature to the stress temperature, cells showed a decrease in the incorporation of Na214CO3 into proteins, and at the same time, the synthesis of a specific subset of heat shock proteins was observed. Ethanol (4%) at 30°C, also caused a response similar to the heat shock upon T. ferrooxidans cells, whereas Sulfolobus cells at 70°C did not incorporate radioactive CO2 in the presence of ethanol, apparently being damaged by the organic solvent. |
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Keywords: | Heat shock response Sulfolobus acidocaldarius Thiobacillus ferrooxidans Thermotolerance Protein synthesis Ethanol |
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