Shima J, et al. (2008) Possible roles of vacuolar H(+)-ATPase and mitochondrial function in tolerance to air-drying stress revealed by genome-wide screening of Saccharomyces cerevisiae deletion strains. Yeast 25(3):179-90
Abstract: Yeasts used in bread making are exposed to air-drying stress during dried yeast production processes. To clarify the genes required for air-drying tolerance, we performed genome-wide screening using the complete deletion strain collection of diploid Saccharomyces cerevisiae. The screening identified 278 gene deletions responsible for air-drying sensitivity. These genes were classified based on their cellular function and on the localization of their gene products. The results showed that the genes required for air-drying tolerance were frequently involved in mitochondrial functions and in connection with vacuolar H(+)-ATPase, which plays a role in vacuolar acidification. To determine the role of vacuolar acidification in air-drying stress tolerance, we monitored intracellular pH. The results showed that intracellular acidification was induced during air-drying and that this acidification was amplified in a deletion mutant of the VMA2 gene encoding a component of vacuolar H(+)-ATPase, suggesting that vacuolar H(+)-ATPase helps maintain intracellular pH homeostasis, which is affected by air-drying stress. To determine the effects of air-drying stress on mitochondria, we analysed the mitochondrial membrane potential under air-drying stress conditions using MitoTracker. The results showed that mitochondria were extremely sensitive to air-drying stress, suggesting that a mitochondrial function is required for tolerance to air-drying stress. We also analysed the correlation between oxidative-stress sensitivity and air-drying-stress sensitivity. The results suggested that oxidative stress is a critical determinant of sensitivity to air-drying stress, although ROS-scavenging systems are not necessary for air-drying stress tolerance. Copyright (c) 2008 John Wiley & Sons, Ltd.
| Status: Published | Type: Journal Article | PubMed ID: 18224659 |
Topics addressed in this paper
Number of different genes curated to this paper: 274
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| ATG17 | ATP17 | BDF1 | BEM1 | BFR1 | BRR1 | BST1 | BUB1 | BUD14 | BUD19 | |
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| BUD22 | BUD26 | BUD27 | BUD28 | CBC2 | CBS2 | CEM1 | CHC1 | CIN8 | COG1 | |
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| VMA2 | VMA21 | VMA3 | VMA4 | VMA7 | VMA8 | VMA9 | VPH2 | VPS16 | VPS45 | |
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