The multisubunit yeast transcription factor IIIC (TFIIIC; also called tau) can undergo considerable conformational changes upon binding to the A and B blocks of tRNA genes. After binding to DNA encoding tRNA (tDNA), TFIIIC acts as an assembly factor to recruit an initiation factor, TFIIIB, via its tau 131 subunit. We have cloned the gene encoding the tau 131 subunit and named it TFC4. This gene is unique, essential for cell viability, and encodes a M(r) 120,153 protein. Epitope-tagging and mobility-shift assays indicated the presence of a single tau 131 subunit in TFIIIC-tDNA complexes. tau 131 contains two sequence motifs, accounting for nearly one-half of the protein mass, that may provide a molecular explanation for the properties of TFIIIC-tDNA complex. A series of 11 copies of the tetratricopeptide repeat motif may account for the flexibility and interaction properties of TFIIIC. A motif akin to the basic helix-loop-helix motif of MyoD suggests the direct involvement of tau 131 in promoting DNA binding of TFIIIB.
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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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