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Msn2/4 mutant 3 hour exposure to zymolyase

ABSTRACT: We did transcription profiling on the effect of msn2 msn4 deletion, genes involved in several stress process Keywords: cell wall stress response

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE9934 | GEO | 2008/09/06

SECONDARY ACCESSION(S): PRJNA114675

REPOSITORIES: GEO

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msn2/4 mutant 3 hour exposure to zymolyase

Project description:We did transcription profiling on the effect of msn2 msn4 deletion, genes involved in several stress process Keywords: cell wall stress response S. cerevisiae (msn2/4 mutant) was grown on YEPD. For Zymolyase experiments, yeast cells were grown overnight at 24 Â°C to an optical density 0.8 - 1 (A600). The culture was refreshed to 0.2 O.D and grown at 24 Â°C for 2h 30min. Next, culture was divided into two parts. One continues growing under same conditions (non-treated culture) while the other was supplemented with 5units/ml Zymolyase 100T. Cells were collected at 3 hours of growth, frozen at -80 Â°C and processed for RNA extraction. The total RNA from one culture was analyzed, and, in addition, for this sample two different hybridizations were performed, including fluorochrome swapping in order to minimize transcriptional changes due to technical variability. This therefore corresponded to two DNA microarrays analyzed.

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Deletion of the transcription factors Hsf1, Msn2 and Msn4 in yeast uncovers transcriptional reprogramming in response to proteotoxic stress

Project description:The heat shock response is an ancient and ubiquitous program allowing organisms to survive adverse environmental conditions. In S. cerevisiae, three transcription factors, Hsf1, Msn2 and Msn4, are thought to regulate the stress response. While Msn2/4 can be deleted, Hsf1 is essential. By combining the depletion of Hsf1 with the deletion of Msn2 and Msn4, we were able to switch off the central stress response. We show that the transcription factors Hsf1 and Msn2/4 follow different strategies and regimes: Whereas Msn2/4 are responsible for a broad metabolic response, Hsf1 triggers a direct chaperone response to stabilize and repair unfolded proteins. Exposure of cells lacking Msn2/4 and Hsf1 to thermal stress resulted in massive protein aggregation. Comparison with wildtype yeast revealed that among the proteins rescued by the stress response are many essential proteins.

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The yeast PP2A-CDC55 phosphatase regulates the transcriptional response to hyperosmolarity stress by regulating Msn2 and Msn4 [Time course 1]

Project description:The yeast PP2A-Cdc55 Serine/Threonine phosphatase regulates transcription under certain conditions. It is required for full activation of the environmental stress response mediated by the transcription factors Msn2 and Msn4. PP2A-Cdc55 contributes to sustained nuclear accumulation of Msn2 and Msn4 and extended chromatin recruitment under stress conditions such as hyperosmolarity stress. Transcript profiles of Msn2 and Msn4 double mutants are similar to cdc55 and the corresponding triple mutants. This argues for a Msn2/4 specific function of PP2A-Cdc55.

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