RNA polymerases A, B, and C from yeast were modified by reaction with 4-formylphenyl-gamma-ester of ATP as priming nucleotide followed by reduction with NaBH4. Upon phosphodiester bond formation with [alpha-32P]UTP, only the second largest subunit, A135, B150, or C128, was labeled in a template-dependent reaction. This indicates that these polypeptide chains are functionally homologous. The product covalently bound to B150 subunit was found to consist of a mixture of ApU and a trinucleotide. Enzyme labeling exhibited the characteristic alpha-amanitin sensitivity reported for A and B RNA polymerases. Labeling of both large subunits of enzyme A and B but not of any of the smaller subunits was observed when the reduction step stabilizing the binding of the priming nucleotide was carried out after limited chain elongation. These results illustrate the conservative evolution of the active site of eukaryotic RNA polymerases.
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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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