Deciphering dynamic dose responses of natural promoters and single cis elements upon osmotic and oxidative stress in yeast

[EN] Fine-tuned activation of gene expression in response to stress is the result of dynamic interactions of transcription factors with specific promoter binding sites. In the study described here we used a time-resolved luciferase reporter assay in living Saccharomyces cerevisiae yeast cells to gain insights into how osmotic and oxidative stress signals modulate gene expression in a dose-sensitive manner. Specifically, the dose-response behavior of four different natural promoters (GRE2, CTT1, SOD2, and CCP1) reveals differences in their sensitivity and dynamics in response to different salt and oxidative stimuli. Characteristic dose-response profiles were also obtained for artificial promoters driven by only one type of stress-regulated consensus element, such as the cyclic AMP-responsive element, stress response element, or AP-1 site. Oxidative and osmotic stress signals activate these elements separately and with different sensitivities through different signaling molecules. Combination of stress-activated cis elements does not, in general, enhance the absolute expression levels; however, specific combinations can increase the inducibility of the promoter in response to different stress doses. Finally, we show that the stress tolerance of the cell critically modulates the dynamics of its transcriptional response in the case of oxidative stress.This work was supported by the Ministerio de Economa y Competitividad (grant BFU2011-23326 to M.P.) and the Ministerio de Ciencia e Innovacion (predoctoral FPI grant to A.R.).Dolz Edo, L.; Rienzo, A.; Poveda Huertes, D.; Pascual-Ahuir Giner, MD.; Proft, MH. (2013). Deciphering dynamic dose responses of natural promoters and single cis elements upon osmotic and oxidative stress in yeast. Molecular and Cellular Biology. 33(11):2228-2240. https://doi.org/10.1128/MCB.00240-13222822403311Gasch, A. P., Spellman, P. T., Kao, C. M., Carmel-Harel, O., Eisen, M. B., Storz, G., … Brown, P. O. (2000). 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