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Distinct Signaling Roles of Ceramide Species in Yeast Revealed Through Integromics Analyses

ABSTRACT: Yeast cells were subjected to different combination of the following perturbations: heat stress, myriocin (ISP1) treatment and lipid (myristate) supplement. Then gene expression and lipidomic data were collected under each experimental condition with triplicates. heat stress, myriocin (ISP1) treatment and lipid (myristate) supplement in triplicates

ORGANISM(S): Saccharomyces cerevisiae

SUBMITTER: Xinghua Lu

PROVIDER: E-GEOD-40399 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Distinct Signaling Roles of Ceramide Species in Yeast Revealed Through Integromics Analyses

Project description:Yeast cells were subjected to different combination of the following perturbations: heat stress, myriocin (ISP1) treatment and lipid (myristate) supplement. Then gene expression and lipidomic data were collected under each experimental condition with triplicates.

2012-08-28 | GSE40399 | GEO

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Quantitative proteomics identifies Ola1p as a positive regulator of heat shock response in Saccharomyces cerevisiae

Project description:Ola1 is implicated in various stress response pathways, as well as in cancer and tumor progression. However, Ola1p functions are divergent between species and still remain poorly understood. Here, we studied the role of Ola1p in the heat shock response in Saccharomyces cerevisiae. We show that deletion of OLA1 results in higher levels of proteins with protective functions for proteome stability under heat stress. We found that Ola1p enriches in detergent-resistant protein aggregates during heat stress. In heat-stressed yeast cells, it rapidly forms assemblies that localize to stress granules. In vitro, Ola1p assembly is protein autonomous and coincides with structural rearrangements that occur at similar temperatures and pH values seen in cells. We further observed that deletion of OLA1 leads to increased ubiquitination of protein aggregates formed during heat stress. Upon stress relief, central factors for protein refolding and the clearance of protein aggregates are synthesized in higher amounts in dola1 cells, whereas global translation reinitiation is decreased in these cells. Our data suggest that Ola1p is a positive factor for stabilizing the misfolded proteome that is sequestered in cytoplasmic stress granules during heat stress and, thereby, enables cells to efficiently restore a functional proteome after stress relief.

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Natural variation in the yeast glucose-signaling network reveals a new role for the Mig3p transcription factor

Project description:The Crabtree effect, in which fermentative metabolism is preferred at the expense of respiration, is a hallmark of budding yeast’s glucose response and a model for the Warburg effect in human tumors. While the glucose-responsive transcriptional repressors Mig1p and Mig2p play well-characterized roles in the Crabtree effect, little function for the related Mig3p transcription factor has been uncovered despite numerous investigations of laboratory yeast strains. Here we studied a wild isolate of Saccharomyces cerevisiae to uncover a critical role for Mig3p that has been lost in S288c-derived laboratory strains. We found that Mig3p affects the expression of hundreds of glucose-responsive genes in the oak strain YPS163, both during growth under standard conditions and upon ethanol treatment. Our results suggest that Mig3p may act as a multifunctional activator/repressor that plays separate roles under standard versus stress conditions, but this function has been largely lost in the lab strains. Population analysis suggests that the lab strain, and several wild strains, harbor mutations that diminish Mig3p function. Thus, by expanding our attention to multiple genetic backgrounds, we have uncovered an important missing link in a key metabolic response. We performed a series of microarray experiments comparing the gene expression response of unstressed or EtOH stressed wild-type or mig3∆ strains in either the BY4741 or YPS163 background (biological triplicates). We also compared gene expression for in reciprocal hemizygous strains (YPS163/BY4741mig3∆ and YPS163mig3∆/BY4742; biological duplicates). Lastly, we measured the gene expression of BY4741 over-expressing BY_MIG3 via galactose induction (biological triplicates).

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