We have found that brefeldin A (BFA) inhibited the growth of an ise1 mutant of Saccharomyces cerevisiae. Genetic complementation and mapping studies demonstrated that ise1 was allelic to erg6, a gene required for the biosynthesis of the principal membrane sterol of yeast, ergosterol. Treatment of ise1 cells with BFA resulted in an immediate block in protein transport through the secretory pathway. Vacuolar carboxypeptidase Y (CPY) and the secreted pheromone alpha-factor accumulated as both the core glycosylated (ER) and alpha 1,6 mannosylated (early Golgi) forms in drug-treated cells. The modification of alpha-factor with alpha 1,6 mannose in BFA-treated cells did not appear to result from retrograde transport of the alpha 1,6 mannosyl-transferase into the ER. We found that transport of CPY from medial and late Golgi compartments to the vacuole was unaffected by BFA, nor was secretion of alpha 1,3 mannosylated alpha-factor or invertase blocked by BFA. The effects of BFA on the secretory pathway were also reversible after brief exposure (< 40 min) to the drug. We suggest that the primary effect of BFA in S. cerevisiae is restricted to the ER and the alpha 1,6 mannosyltransferase compartment of the Golgi complex.
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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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