Amino acid sequence comparison of the largest subunit of the three forms of yeast nuclear RNA polymerase disclosed six major conserved regions that are partly retained in the cognate subunits from bacteria, viral, and insect enzymes (Mémet, S., Gouy, M., Marck, C., Sentenac, A., and Buhler, J.-M. (1988) J. Biol. Chem. 263, 2830-2839). Within these conserved domains, the high sequence similarity of B220 and C160 subunits (52% identity) sets them apart from yeast enzyme A subunit A190. Parsimony analysis at the gene and protein levels suggests the existence of a transient ancestor to eukaryotic RNA polymerases B and C. These results are discussed in the light of the recent finding of class C genes containing RNA polymerase B promoter elements.
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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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