Understanding the genetic basis of the yeast ability to proliferate and ferment in the presence of restrictive concentrations of ethanol is of importance to both science and technology. In this study, we searched for genes that improve ethanol tolerance in ethanol-sensitive strains. To screen for suppressors of ethanol sensitivity, we introduced a 2?-based genomic library, prepared from the ethanol-tolerant yeast S288C, into the ethanol-sensitive strain W303-1A. Two genomic fragments from this library rescued the ethanol sensitivity of W303-1A. One contained the PDE2 gene, which when over-expressed, conferred ethanol tolerance. Surprisingly, the effect of PDE2 was not mediated via MSN2/MSN4 transcription factors, as it was able to improve ethanol tolerance in msn2?msn4? strain. In the second genomic fragment, it was the N-terminal region of the SSD1 gene that carried the ethanol-tolerant phenotype. The SSD1-V allele of the polymorphic SSD1 gene expressed from a low-copy number plasmid also resulted in the tolerant phenotype. Both SSD1 and PDE2 seemed to improve ethanol tolerance by maintaining robustness of the yeast cell wall.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Annotation Extension||Reference|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Assay||Construct||Conditions||Strain Background||Reference|