We show that the yeast HAP1 activator locus encodes a protein that binds in vitro to the upstream activation site, UAS1, of the CYC1 gene (iso-1-cytochrome c). Binding of wild-type HAP1 and truncated HAP1 derivatives to UAS1 is evident in crudely fractionated yeast extracts using the gel electrophoresis DNA binding assay. The binding of HAP1 in vitro, like the activity of UAS1 in vivo, is stimulated by heme. HAP1 binds to region B, one of two portions of UAS1 shown to be important by genetic analysis of the site. Surprisingly, HAP1 binds to the same sequence as a second factor, RC2. Both HAP1 and RC2 bind to the same side of the helix, and make similar but not identical major and minor groove contacts that span two full turns. An additional factor that binds to the second important part of UAS1, the region A factor (RAF), is also identified. A model depicting the interplay of HAP1, RC2, and RAF in the control of UAS1 is presented.
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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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