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Media type:
E-Article
Title:
Stress Tolerance of the Saccharomyces cerevisiae Adenylate Cyclase fil1 (CYR1lys1682) Mutant Depends on Hsp26
Contributor:
Vianna, Cristina R.;
Ferreira, Mariana C.;
Silva, Carol L.C.;
Tanghe, An;
Neves, Maria J.;
Thevelein, Johan M.;
Rosa, Carlos A.;
Van Dijck, Patrick
Description:
<jats:p>Fermentation-induced loss of stress resistance in yeast is an important phenotype from an industrial point of view. It hampers optimal use of frozen dough applications as well as high gravity brewing fermentations because these applications require stress-tolerant yeast strains during active fermentation. Different mutants (e.g. <i>fil1</i>, an adenylate cyclase mutant <i>CYR1</i><sup>lys1682</sup>) that are affected in this loss of stress resistance have been isolated, but so far the identification of the target genes important for the increased tolerance has failed. Previously we have shown that neither trehalose nor Hsp104 nor STRE-controlled genes are involved in the higher stress tolerance of the <i>fil1</i> mutant. The contribution of other putative downstream factors of the PKA pathway was investigated and here we show that the small heat-shock protein Hsp26 is required for the high heat stress tolerance of the <i>fil1</i> mutant, both in stationary phase cells as well as during active fermentation.</jats:p>