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 (UB14) 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.
Grant
C M
CM
Biological Laboratory, University of Kent, Canterbury, UK.
Firoozan
M
M
Tuite
M F
MF
D003513:Cycloheximide / Q000494:pharmacology; D005656:Fungal Proteins / Q000096:biosynthesis; D005786:Gene Expression Regulation; D006360:Heat-Shock Proteins / Q000096:biosynthesis* / Q000235:genetics; D006358:Hot Temperature; D009154:Mutation; D010303:Paromomycin / Q000494:pharmacology*; D014176:Protein Biosynthesis / Q000187:drug effects; D012331:RNA, Fungal / Q000187:drug effects* / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D014452:Ubiquitins / Q000096:biosynthesis / Q000235:genetics
D005656:Fungal Proteins; D006360:Heat-Shock Proteins; D012331:RNA, Fungal; D014452:Ubiquitins; D010303:Paromomycin; D003513:Cycloheximide