DNA recognition sequences for dimeric proteins typically contain two types of information. The first is the DNA sequence of each half-site, and the second is the arrangement of these half-sites. We show that dimers of the yeast homeodomain protein alpha 2, although able to read the first type of information, lack the ability to assess the second type. Rather, alpha 2 dimers bind with equal affinity to artificial operators in which the two half-sites are arrayed as inverted repeats, as direct repeats, or as everted (inside-out) repeats. We show that a second protein-MCM1-sets the exact spacing and orientation of the homeodomains in the alpha 2 dimer so that they accommodate only the geometry of the naturally occurring operators. These experiments show directly how the target specificity of a homeodomain protein is raised by an auxiliary protein, allowing it to distinguish the biologically correct operators from closely related sequences in the cell.
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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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