Rox1 is a repressor of the hypoxic genes of Saccharomyces cerevisiae. It binds to a specific hypoxic consensus sequence in the upstream region of these genes and represses transcription in conjunction with the general repression complex Tup1-Ssn6. In this study, we demonstrated that the first 100 amino acids comprising the HMG domain of Rox1 were responsible for DNA binding and that when bound, Rox1 bent DNA at an angle of 90 degrees. A mutational analysis resulted in the isolation of seven missense mutations, all located within the HMG domain, that caused loss of DNA binding. The effect of these mutations on the structure of Rox1 was evaluated on the basis of the homology between Rox1 and the human male sex-determining protein SRY, for which a structural model is available. The failure to isolate missense mutations in the carboxy-terminal three-quarters of the protein prompted a deletion analysis of this region. The results suggested that this region was responsible for the repression function of Rox1 and that the repression information was redundant. This hypothesis was confirmed by using a set of fusions between sequences encoding the GAL4 DNA-binding domain and portions of ROX1. Those fusions containing either the entire carboxy-terminal region or either half of it were capable of repression. Repression by selected fusions was demonstrated to be dependent on Ssn6.
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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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