A new method for detecting invertase activity in Saccharomyces cerevisiae colonies was used to screen for mutants resistant to catabolite repression of invertase. Mutations causing the highest level of derepression were located in two previously identified genes, cyc8 and tup1. Several of the cyc8 mutations, notably cyc8-10 and cyc8-11, were temperature dependent, repressed at 23 degrees C, and derepressed at 37 degrees C. The kinetics of derepression of invertase mRNA in cyc8-10 cells shifted from 23 to 37 degrees C was determined by Northern blots. Invertase mRNA was detectable at 5 min after the shift, with kinetics of accumulation very similar to that of wild-type cells shifted from high-glucose to low-glucose medium. Assays of representative enzymes showed that many but not all glucose-repressible enzymes are derepressed in both cyc8 and tup1 mutants. cyc8 and tup1 appear to be the major negative regulatory genes controlling catabolite repression in yeasts.
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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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