In Saccharomyces cerevisiae, the RNA polymerase II (RNA Pol II) carboxyl-terminal domain (CTD) is required for viability, and truncation of the CTD results in promoter dependent transcriptional defects. A CTD-less RNA Pol II is unable to support transcription in yeast extracts, but basal transcription reactions reconstituted from highly purified general transcription factors are CTD-independent. To reconcile these two findings, we have taken a biochemical approach using yeast extracts and asked whether there is a factor in the cell that confers CTD-dependence upon transcription. By placing a cleavage site for the tobacco etch virus protease prior to the CTD, we have created a highly specific method for removing the CTD from RNA Pol II in yeast whole cell extracts. Using derivatives of this strain, we have analyzed the role of the Srb8-11 complex, Mediator, and TFIIH, in CTD-dependent basal transcription by either mutation or immunodepletion of their function. We have found that Mediator is a direct intermediary of CTD-dependent basal transcription in extracts and that the requirement for Mediator and the CTD in basal transcription originates from their ability to compensate for a limiting amount of TFIIH activity in extracts.
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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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Evidence ID | Analyze ID | File | Description |
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