Saccharomyces cerevisiae transcription factor IIIC/tau is a multisubunit DNA-binding protein that plays key roles in tRNA and 5 S rRNA gene activation. Subunit composition, stoichiometry, and in vivo phosphorylation of TFIIIC/tau factor were investigated using factor prepared from strains carrying modified forms of TFC1, the gene encoding the 95-kDa TFIIIC/tau subunit (tau 95). Using an epitope-tagged TFC1 as well as a TFC1-lacZ fusion, TFIIIC was shown to contain a single 95-kDa subunit, which was localized by electron microscopy into tau A, the A block-binding domain of TFIIIC/tau. Three 35S-labeled polypeptides (at 138, 131, and 91 kDa) coimmunoprecipitated with a tau 95-beta-galactosidase fusion protein. The coprecipitation of the 91-kDa polypeptide makes it a likely subunit of the factor. Immunoprecipitation from 32P-labeled extracts revealed that three of the subunits (138, 131, and 95 kDa), but not the 91-kDa component, are phosphorylated in vivo.
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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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