In the yeast Saccharomyces cerevisiae, glucose repression of SUC2 transcription requires the SSN6-TUP1 repressor complex. It has been proposed that the DNA-binding protein MIG1 secures SSN6-TUP1 to the SUC2 promoter. Here we show that a mig1 deletion does not cause nearly as dramatic a loss of repression as ssn6: glucose-grown mig1 mutants display 20-fold lower SUC2 expression than ssn6 mutants. Thus, repression by SSN6-TUP1 is not mediated solely by MIG1, but also involves MIG1-independent mechanisms. We report that mig1 partially restores SUC2 expression in mutants lacking the SNF1 protein kinase and show that mig1 is allelic to ssn1, a mutation selected as a suppressor of snf1. Other SSN genes identified in this selection were therefore candidates for a role in repression of SUC2. We show that mig1 acts synergistically with ssn2 through ssn5, ssn7, and ssn8 to relieve glucose repression of SUC2 and to suppress the requirement for SNF1. These findings indicate that the SSN proteins contribute to repression of SUC2, and the pleiotropic phenotypes of the ssn mutants suggest global roles in repression. Finally, the regulated SUC2 expression observed in snf1 mig1 mutants indicates that signals regarding glucose availability can be transmitted independently of the SNF1 protein kinase.
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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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