General resistance to sterol biosynthesis inhibitors inSaccharomyces cerevisiae
| Autor: | Christophe Marcireau, Francis Karst, Didier Delourme, Véronique Ladeveze |
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| Rok vydání: | 1993 |
| Předmět: |
Antifungal Agents
Isomerase activity Genes Fungal Restriction Mapping Mutant Saccharomyces cerevisiae Gene Expression Polymerase Chain Reaction Biochemistry chemistry.chemical_compound Hemiterpenes Methionine Biosynthesis Ergosterol polycyclic compounds Isomerases DNA Primers chemistry.chemical_classification biology Organic Chemistry Chromosome Mapping Drug Resistance Microbial Cell Biology Carbon-Carbon Double Bond Isomerases biology.organism_classification Sterol Yeast Sterols Enzyme chemistry lipids (amino acids peptides and proteins) Chromosomes Fungal |
| Zdroj: | Lipids. 28:907-912 |
| ISSN: | 1558-9307 0024-4201 |
| DOI: | 10.1007/bf02537499 |
| Popis: | Screening for resistance to fenpropimorph was undertaken in order to isolate yeast mutants affected in the regulation of the ergosterol pathway. Among the mutants isolated, one bearing the recessive fen1-1 mutation was characterized by a 1.5-fold increase in the ergosterol level and a general resistance to sterol biosynthesis inhibitors. The fen1-1 mutation was linked to MAT locus on chromosome III. The measurement of enzyme activities involved in the ergosterol pathway revealed that isopentenyl diphosphate (IPP) isomerase activity was specifically increased 1.5-fold as compared to the wild type strain. However, overexpression of IPP isomerase in the wild type strain was not by itself sufficient to lead to sterol increase or resistance to sterol biosynthesis inhibitors, showing that IPP isomerase is not a limiting step in the pathway. The fen1-1 mutation permits viability in aerobiosis of yeast disrupted for sterol-14 reductase in absence of exogenous ergosterol supplementation, whereas the corresponding strain bearing the wild type FEN1 allele grows only in anaerobiosis. This result shows that ignosterol is able to efficiently replace ergosterol as bulk membrane component and that the fen1-1 mutation eliminates the specific ergosterol requirement in yeast. |
| Databáze: | OpenAIRE |
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