We investigated the impact of the deletions of genes from the final steps in the biosynthesis of ergosterol (ERG6, ERG2, ERG3, ERG5, ERG4) on the physiological function of the Saccharomyces cerevisiae plasma membrane by a combination of biological tests and the diS-C3(3) fluorescence assay. Most of the erg mutants were more sensitive than the wild type to salt stress or cationic drugs, their susceptibilities were proportional to the hyperpolarization of their plasma membranes. The different sterol composition of the plasma membrane played an important role in the short-term and long-term processes that accompanied the exposure of erg strains to a hyperosmotic stress (effect on cell size, pH homeostasis and survival of yeasts), as well as in the resistance of cells to antifungal drugs. The pleiotropic drug-sensitive phenotypes of erg strains were, to a large extent, a result of the reduced efficiency of the Pdr5 efflux pump, which was shown to be more sensitive to the sterol content of the plasma membrane than Snq2p. In summary, the erg4Δ and erg6Δ mutants exhibited the most compromised phenotypes. As Erg6p is not involved in the cholesterol biosynthetic pathway, it may become a target for a new generation of antifungal drugs.

• MeSH
• ABC transportéry genetika   metabolismus   MeSH
• antifungální látky farmakologie   MeSH
• biosyntetické dráhy genetika   MeSH
• buněčná membrána chemie   fyziologie   MeSH
• ergosterol biosyntéza   chemie   MeSH
• flukonazol farmakologie   MeSH
• fluorescenční mikroskopie MeSH
• koncentrace vodíkových iontů MeSH
• membránové potenciály fyziologie   MeSH
• methyltransferasy genetika   metabolismus   MeSH
• mnohočetná fungální léková rezistence účinky léků   genetika   fyziologie   MeSH
• molekulární struktura MeSH
• mutace MeSH
• Saccharomyces cerevisiae - proteiny genetika   metabolismus   MeSH
• Saccharomyces cerevisiae chemie   genetika   fyziologie   MeSH
• tolerance k soli genetika   fyziologie   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• ABC transportéry MeSH
• antifungální látky MeSH
• delta 24-sterol methyltransferase MeSH Prohlížeč
• ergosterol MeSH
• flukonazol MeSH
• methyltransferasy MeSH
• PDR5 protein, S cerevisiae MeSH Prohlížeč
• Saccharomyces cerevisiae - proteiny MeSH
• SNQ2 protein, S cerevisiae MeSH Prohlížeč