Two azole resistant isolates of Saccharomyces cerevisiae carried mutations allelic to erg 3 and were blocked to differing degrees at the C5-6 desaturation step of ergosterol biosynthesis. When treated with the sterol 14 alpha-demethylation inhibitor fluconazole the wild-type sensitive strain accumulated lanosterol and 14 alpha-methyl-erogosta-8,24(28)-dien-3 beta, 6 alpha-diol (14-methyl-3,6 diol). The stringent desaturase mutant, A2, accumulated 14 alpha-methyl-8,24(28)-dien-3 beta-ol (14-methyl fecosterol) and lanosterol as the major sterol components when treated with fluconazole. Resistant isolate A3 accumulated 14-methyl-3,6-diol, 14-methyl fecosterol, and lanosterol and was only partially blocked at sterol C5-6 desaturation. We conclude that functional sterol C5-6 desaturase is required for the synthesis of 14-methyl-3,6-diol under conditions of azole inhibition. We present a new hypothesis for the mode of action of azole antifungals based on the inability of 14-methyl-3,6-diol to support growth, and suggest that growth can occur through utilisation of 14-methyl fecosterol, produced by a combination of azole inhibition and defective sterol C5-6 desaturation.
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| Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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| Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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