The ADR1 protein recognizes a six base-pair consensus DNA sequence using two zinc fingers and an adjacent accessory motif. Kinetic measurements were performed on the DNA-binding domain of ADR1 using surface plasmon resonance. Binding by ADR1 was characterized to two known native binding sequences from the ADH2 and CTA1 promoter regions, which differ in two of the six consensus positions. In addition, non-specific binding by ADR1 to a random DNA sequence was measured. ADR1 binds the native sites with nanomolar affinities. Remarkably, ADR1 binds non-specific DNA with affinities only approximately tenfold lower than the native sequences. The specific and non-specific binding affinities are conferred mainly by differences in the association phase of DNA binding. The association rate for the complex is strongly influenced by the proximal accessory region, while the dissociation reaction and specificity of binding are controlled by the two zinc fingers. Binding kinetics of two ADR1 mutants was also examined. ADR1 containing an R91K mutation in the accessory region bound with similar affinity to wild-type, but with slightly less sequence specificity. The R91K mutation was observed to increase binding affinity to a suboptimal sequence by decreasing the complex dissociation rate. L146H, a change-of-specificity mutation at the +3 position of the second zinc finger, bound its preferred sequence with a slightly higher affinity than wild-type. The L146H mutant indicates that beneficial protein-DNA contacts provide similar levels of stabilization to the complex, whether they are hydrogen-bonding or van der Waals interactions.
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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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