Yeast ribonucleic acid (RNA) polymerase II, isolated after fractionation on diethylaminoethyl (DEAE)-cellulose (DE-52) or on DEAE-Sephadex (A-25), is 50% inhibited by 1.5 mug of alpha-amanitin. This inhibition is independent of the sequence of interaction of enzyme, template, nucleotides, and antibiotic and is expressed immediately on addition of alpha-amanitin to a preparation actively synthesizing RNA. Thus, alpha-amanitin's primary effect is inhibition of elongation of preinitiated RNA sequences in this system, as in others. A single peak of alpha-amanitin-resistant RNA polymerase activity (I) was eluted before enzyme II on either column. On A-25 but not on DE-52, a third peak of activity (III) was eluted after enzyme II. This activity was also resistant to alpha-amanitin. Enzymes I, II, and III were 50% inhibited by 3, 4, and 3 mug of thiolutin per ml, respectively. The extent of inhibition was independent of the nature of the template (native or denatured salmon sperm deoxyribonucleic acid or poly(dA-dT) or of the presence of 0.4 mM dithiothreitol, but this marked inhibition was only seen when enzymes were preincubated with thiolutin in the absence of template. Template protected the enzymes against thiolutin in the absence of nucleotides. Either the sensitive site on the polymerase is only accessible to thiolutin before interaction with template or thiolutin inhibits functional polymerase-template interaction but not elongation of preinitiated RNA chains.
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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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