Budding yeast Rap1 is a specific double-stranded DNA-binding protein involved in repression and activation of gene transcription and in the establishment of the nucleoprotein complex formed at telomeres. The DNA-binding domain (DBD) of Rap1 forms a high affinity complex with DNA where both Myb-like domains bind to the recognition site. However, we recently showed that the DBD can also access an alternative, lower affinity DNA-binding mode where a single Myb-like domain binds. This results in Rap1-DNA complexes with stoichiometry higher than previously anticipated. In this work, we show that the ability of the DBD to form higher stoichiometry complexes on DNA is maintained also in larger Rap1 constructs. This indicates that transition between at least two DNA-binding modes is a general property of the protein and not a specific feature of the DBD in isolation. The transition between binding modes is modulated by the C-terminal wrapping loop within the DBD, consistent with the proposed model in which the transient opening of this region allows a switch between binding modes. Finally, we provide evidence that the Rap1 C terminus interacts with the DNA-binding domain, suggesting a complex network of interactions that couples changes in conformation of the protein to the binding of its DNA recognition sequence.
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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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