A physical DNA binding assay was employed to analyze the binding of yeast RNA polymerase III transcription factor C (TFIIIC) to tRNA genes. The assay allowed us to measure the equilibrium constants for specific and nonspecific TFIIIC-DNA binding and to assess the effects of tRNATyr-DNA gene promoter mutations on binding. Sequence alterations in the B block element of the promoter greatly affect the equilibrium constant for specific TFIIIC binding (K8). Mutations which decrease tRNATyr homology to the recognized B block consensus sequence drastically reduce K8 (43- to 370-fold), while mutations which increase homology increase K8 (4- to 5-fold). By contrast, point mutations in the A block element of the tRNATyr promoter have less than 2-fold effects on K8; however, total deletion of A block sequences reduces K8 2- to 5-fold. These results indicate that TFIIIC-rTNA gene binding involves interactions with both A block and B block sequences, but B block interactions dominate, and the relative contribution of A block interactions is small. Since A block sequences are absolutely required for active tRNA gene transcription, the binding results suggest that the role of A block sequences in transcription is not confined solely to TFIIIC binding.
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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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