RNA polymerase II lacking the fourth and seventh largest subunits (pol II delta 4/7) was purified from Saccharomyces cerevisiae strain rpb-4, in which the gene for the fourth largest subunit is deleted. pol II delta 4/7 was indistinguishable from wild-type pol II (holoenzyme) in promoter-independent initiation/chain elongation activity (400-800 nmol of nucleotide incorporated/10 min/mg of protein at 22 degrees C), in rate of chain elongation (20-25 nucleotides/s), and in the recognition of pause sites in the DNA template. In contrast to pol II holoenzyme, pol II delta 4/7 was inactive in promoter-directed initiation of transcription in vitro. The addition of an equimolar complex of the fourth and seventh largest subunits, purified from pol II holoenzyme by ion-exchange chromatography in the presence of urea, restored promoter-directed initiation activity to pol II delta 4/7. The transcriptional activator protein Gal4-VP16 could also elicit promoter-directed initiation by pol II delta 4/7 from a promoter with a Gal4 binding site. Complementation was observed between extracts of strain rpb-4, lacking the fourth largest subunit, and strain Y260-1, with a defect in the largest subunit. These extracts were individually inactive, but a mixture would support promoter-directed initiation. The fourth and seventh largest subunits may, therefore, shuttle between polymerase molecules.
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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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