The yeast cell type regulator alpha 1 cooperates with a constitutive factor, MCM1 protein, to recognize the promoter and activate transcription of several alpha-specific genes. I show here that the alpha 1 and MCM1 proteins bind specifically to one of the two strands of their recognition sequence. This single-strand-binding activity shares several characteristics with the duplex-binding properties of these proteins: (i) the MCM1 protein binds alone to single-stranded and duplex sequences of both the alpha-specific (P'Q) and a-specific (P) binding sites; (ii) the alpha 1 protein requires both the MCM1 protein and the Q sequence to bind either single-stranded or duplex DNA; (iii) the alpha 1 protein stimulates binding of the MCM1 protein to both single-stranded and duplex DNAs; and (iv) the affinities of the proteins for single-stranded and duplex DNAs are comparable.
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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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