Mutations in the SNF2 gene of Saccharomyces cerevisiae prevent derepression of the SUC2 (invertase) gene, and other glucose-repressible genes, in response to glucose deprivation. We have isolated 25 partial phenotypic revertants of a snf2 mutant that are able to derepress secreted invertase. These revertants all carried suppressor mutations at a single locus, designated SSN20 (suppressor of snf2). Alleles with dominant, partially dominant and recessive suppressor phenotypes were recovered, but all were only partial suppressors of snf2, reversing the defect in invertase synthesis but not other defects. All alleles also caused recessive, temperature-sensitive lethality and a recessive defect in galactose utilization, regardless of the SNF2 genotype. No significant effect on SUC2 expression was detected in a wild-type (SNF2) genetic background. The ssn20 mutations also suppressed the defects in invertase derepression caused by snf5 and snf6 mutations, and selection for invertase-producing revertants of snf5 mutants yielded only additional ssn20 alleles. These findings suggest that the roles of the SNF2, SNF5 and SNF6 genes in regulation of SUC2 are functionally related and that SSN20 plays a role in expression of a variety of yeast genes.
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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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