Air-drying kinetics affect yeast membrane organization and survival
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The plasma membrane (PM) is a key structure for the survival of cells during dehydration. In this study, we focused on the concomitant changes in survival and in the lateral organization of the PM in yeast strains during desiccation, a natural or technological environmental perturbation that involves transition from a liquid to a solid medium. To evaluate the role of the PM in survival during air-drying, a wild-type yeast strain and an osmotically fragile mutant (erg6Δ) were used. The lateral organization of the PM (microdomain distribution) was observed using a fluorescent marker related to a specific green fluorescent protein-labeled membrane protein (Sur7-GFP) after progressive or rapid desiccation. We also evaluated yeast behavior during a model dehydration experiment performed in liquid medium (osmotic stress). For both strains, we observed similar behavior after osmotic and desiccation stresses. In particular, the same lethal magnitude of dehydration and the same lethal kinetic effect were found for both dehydration methods. Thus, yeast survival after progressive air-drying was related to PM reorganization, suggesting the positive contribution of passive lateral rearrangements of the membrane components. This study also showed that the use of glycerol solutions is an efficient means to simulate air-drying desiccation.
KeywordsDesiccation Osmotic dehydration Cell survival Plasma membrane Yeast
We are grateful to W. Tanner and G. Grossmann (University of Regensburg, Cell Biology and Plant Physiology, Regensburg, Germany) for providing the plasmid YIp211SUR7GFP. We thank the personnel of the Plateau Technique “Imagerie Spectroscopique” IFR 92 (Université de Bourgogne, Dijon, France). This work was supported by French Ministry of Research, the Regional Council of Burgundy, Merck MF (Dijon, France), and the “FUI Probiotique” program supported by Vitagora (Dijon, France).
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