A major mediator of glucose repression in yeast is Mig1, a zinc finger protein that binds to a GC-rich recognition sequence found upstream of many glucose-repressible genes. Because these Mig1 sites are found upstream of genes under different modes of regulation, we studied regulation of transcription mediated by an isolated Mig1 site placed upstream of a reporter gene under control of UAS(CYC1). The Mig1 site responded appropriately to glucose control and regulatory mutations, including snf1, reg1, cyc8, and tup1, mimicking the behavior of the SUC2 gene. Deletion of the MIG1-coding gene reduced but did not eliminate glucose repression mediated by the Mig1 site. Complete loss of repression was seen in a mig1 mig2 double mutant. When the UAS(CYC1) was replaced by UAS(ADH1) in the reporter plasmid, the Mig1 site activated transcription under most conditions. Mutations of the two Mig1 binding sites in the SUC2 promoter resulted in loss of activation of SUC2 expression. These results suggest the presence of an unknown activator or activators that binds to the Mig1 site. The activator is not any of the proteins previously proposed to bind to this site, including Mig1, Mig2, Msn2, or Msn4. Band shift assays showed that Mig1 is the major protein in yeast cell extracts that binds to the Mig1 site in vitro. This binding is not regulated by glucose or mutations in CYC8 or TUP1.
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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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