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Mistranslation induces the heat‐shock response in the yeast Saccharomyces cerevisiae

The synthesis of heat‐shock proteins can be triggered by a variety of stress‐inducing conditions. Here we show that translational misreading caused by growth in the presence of the aminoglycoside antibiotic paromomycin will induce the heat‐shock response in the yeast Saccharomyces cerevisiae. This was demonstrated (i) by the acquisition of thermotolerance, and (ii) by elevated levels of expression of the heat‐shock protein, hsp70. In addition, transcription of the ubiquitin gene (UBI4) was increased in paromomycin‐grown cells. Control experiments with the protein synthesis inhibitor cycloheximide (which does not induce translational misreading) demonstrated that the response was not due to inhibition of protein synthesis per se. These observations strongly suggest that the synthesis of abnormally high levels of aberrant proteins is the trigger of the heat‐shock response in this simple eukaryote.