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Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae

Yeast S. cerevisiae has been shown to suppress a sterol biosynthesis as a response to hyperosmotic stress. In the case of sodium stress, the failure to suppress biosynthesis leads to an increase in cytosolic sodium. The major yeast sterol, ergosterol, is known to regulate functioning of plasma membr...

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Autores principales: Sokolov, Svyatoslav S., Popova, Marina M., Pohl, Peter, Horner, Andreas, Akimov, Sergey A., Kireeva, Natalia A., Knorre, Dmitry A., Batishchev, Oleg V., Severin, Fedor F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9781751/
https://www.ncbi.nlm.nih.gov/pubmed/36557185
http://dx.doi.org/10.3390/membranes12121278
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author Sokolov, Svyatoslav S.
Popova, Marina M.
Pohl, Peter
Horner, Andreas
Akimov, Sergey A.
Kireeva, Natalia A.
Knorre, Dmitry A.
Batishchev, Oleg V.
Severin, Fedor F.
author_facet Sokolov, Svyatoslav S.
Popova, Marina M.
Pohl, Peter
Horner, Andreas
Akimov, Sergey A.
Kireeva, Natalia A.
Knorre, Dmitry A.
Batishchev, Oleg V.
Severin, Fedor F.
author_sort Sokolov, Svyatoslav S.
collection PubMed
description Yeast S. cerevisiae has been shown to suppress a sterol biosynthesis as a response to hyperosmotic stress. In the case of sodium stress, the failure to suppress biosynthesis leads to an increase in cytosolic sodium. The major yeast sterol, ergosterol, is known to regulate functioning of plasma membrane proteins. Therefore, it has been suggested that the suppression of its biosynthesis is needed to adjust the activity of the plasma membrane sodium pumps and channels. However, as the sterol concentration is in the range of thirty to forty percent of total plasma membrane lipids, it is believed that its primary biological role is not regulatory but structural. Here we studied how lowering the sterol content affects the response of a lipid bilayer to an osmotic stress. In accordance with previous observations, we found that a decrease of the sterol fraction increases a water permeability of the liposomal membranes. Yet, we also found that sterol-free giant unilamellar vesicles reduced their volume during transient application of the hyperosmotic stress to a greater extent than the sterol-rich ones. Furthermore, our data suggest that lowering the sterol content in yeast cells allows the shrinkage to prevent the osmotic pressure-induced plasma membrane rupture. We also found that mutant yeast cells with the elevated level of sterol accumulated propidium iodide when exposed to mild hyperosmotic conditions followed by hypoosmotic stress. It is likely that the decrease in a plasma membrane sterol content stimulates a drop in cell volume under hyperosmotic stress, which is beneficial in the case of a subsequent hypo-osmotic one.
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spelling pubmed-97817512022-12-24 Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae Sokolov, Svyatoslav S. Popova, Marina M. Pohl, Peter Horner, Andreas Akimov, Sergey A. Kireeva, Natalia A. Knorre, Dmitry A. Batishchev, Oleg V. Severin, Fedor F. Membranes (Basel) Article Yeast S. cerevisiae has been shown to suppress a sterol biosynthesis as a response to hyperosmotic stress. In the case of sodium stress, the failure to suppress biosynthesis leads to an increase in cytosolic sodium. The major yeast sterol, ergosterol, is known to regulate functioning of plasma membrane proteins. Therefore, it has been suggested that the suppression of its biosynthesis is needed to adjust the activity of the plasma membrane sodium pumps and channels. However, as the sterol concentration is in the range of thirty to forty percent of total plasma membrane lipids, it is believed that its primary biological role is not regulatory but structural. Here we studied how lowering the sterol content affects the response of a lipid bilayer to an osmotic stress. In accordance with previous observations, we found that a decrease of the sterol fraction increases a water permeability of the liposomal membranes. Yet, we also found that sterol-free giant unilamellar vesicles reduced their volume during transient application of the hyperosmotic stress to a greater extent than the sterol-rich ones. Furthermore, our data suggest that lowering the sterol content in yeast cells allows the shrinkage to prevent the osmotic pressure-induced plasma membrane rupture. We also found that mutant yeast cells with the elevated level of sterol accumulated propidium iodide when exposed to mild hyperosmotic conditions followed by hypoosmotic stress. It is likely that the decrease in a plasma membrane sterol content stimulates a drop in cell volume under hyperosmotic stress, which is beneficial in the case of a subsequent hypo-osmotic one. MDPI 2022-12-17 /pmc/articles/PMC9781751/ /pubmed/36557185 http://dx.doi.org/10.3390/membranes12121278 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sokolov, Svyatoslav S.
Popova, Marina M.
Pohl, Peter
Horner, Andreas
Akimov, Sergey A.
Kireeva, Natalia A.
Knorre, Dmitry A.
Batishchev, Oleg V.
Severin, Fedor F.
Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title_full Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title_fullStr Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title_full_unstemmed Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title_short Structural Role of Plasma Membrane Sterols in Osmotic Stress Tolerance of Yeast Saccharomyces cerevisiae
title_sort structural role of plasma membrane sterols in osmotic stress tolerance of yeast saccharomyces cerevisiae
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9781751/
https://www.ncbi.nlm.nih.gov/pubmed/36557185
http://dx.doi.org/10.3390/membranes12121278
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