Proper regulation of inositolphosphorylceramide levels is required for acquirement of low pH resistance in budding yeast.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
01 07 2020
01 07 2020
Historique:
received:
19
11
2019
accepted:
12
06
2020
entrez:
3
7
2020
pubmed:
3
7
2020
medline:
15
12
2020
Statut:
epublish
Résumé
All organisms have stress response systems to protect themselves from various environmental stresses, and regulation of membrane lipids is thought to play an important role in acquirement of stress tolerance. Complex sphingolipids in the yeast Saccharomyces cerevisiae are classified into three types based on differences in the structure of the polar head group, and the compositions and quantities of complex sphingolipids in biomembranes are tightly regulated. In this study, we found that the accumulation of inositol phosphorylceramides (IPCs) due to a defect of mannosylinositol phosphorylceramide biosynthesis (sur1∆ csh1∆), i.e., disruption of the balance of the composition of complex sphingolipids, causes hypersensitivity to low pH conditions (pH 4.0-2.5). Furthermore, screening of suppressor mutations that confer low pH resistance to sur1∆ csh1∆ cells revealed that a change in ergosterol homeostasis at plasma membranes can rescue the hypersensitivity, suggesting the functional relationship between complex sphingolipids and ergosterol under low pH conditions. Under low pH conditions, wild-type yeast cells exhibited decreases in IPC levels, and forced enhancement of the biosynthesis of IPCs causes low pH hypersensitivity. Thus, it was suggested that the accumulation of IPCs is detrimental to yeast under low pH conditions, and downregulation of IPC levels is one of the adaptation mechanisms for low pH conditions.
Identifiants
pubmed: 32612142
doi: 10.1038/s41598-020-67734-8
pii: 10.1038/s41598-020-67734-8
pmc: PMC7329899
doi:
Substances chimiques
Glycosphingolipids
0
Membrane Proteins
0
Saccharomyces cerevisiae Proteins
0
inositolphosphoceramides
0
Glycosyltransferases
EC 2.4.-
SUR1 protein, S cerevisiae
EC 2.4.-.-
Csh1 protein, S cerevisiae
EC 2.4.1.-
Mannosyltransferases
EC 2.4.1.-
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
10792Références
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