A single-gene nuclear mutant has been isolated in Saccharomyces cerevisiae which cannot grow on minimal medium supplemented with ethanol, acetate, pyruvate, aspartate, or oxaloacetate as sole carbon sources. It will grow on complete medium with these carbon sources, and on minimal medium with dextrose as carbon source. The only supplement which will permit growth on minimal medium with ethanol or pyruvate is aspartate, so the mutant is an aspartate auxotroph when grown on these nonfermentable substrates. It exhibits enhanced levels of phosphoenolpyruvate carboxykinase (EC 4.1.1.49) when grown on dextrose. The mutant can survive as an alcohol dehydrogenase-negative, indicating that the defect is not in the Krebs Cycle or in electron transport. When grown on pyruvate, it produces two to three times as much free alanine and half as much aspartate plus asparagine as the wild type. Two different assays show that the mutant phenotype is due to a deficiency of pyruvate carboxylase (EC 6.4.1.1), an important anaplerotic enzyme. Inferences that can be drawn from the characteristics of this mutant include (a) the glyoxylate cycle is probably located entirely outside the mitochondria, (b) the inner mitochondrial membrane appears to be impermeable to oxaloacetate, and (c) a succinate-malate exchange across the inner mitochondrial membrane connects the glyoxylate and Krebs cycles when yeast is grown on minimal medium with ethanol as a sole carbon source.
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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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