The function of the conserved zinc-binding domains in the related Pol II- and Pol III-specific factors TFIIB and Brf was investigated. Three-dimensional structure modeling and mutagenesis studies indicated that for both factors, the functional surface of the zinc ribbon fold consists of a small conserved patch of residues located on one face of the domain comprised mainly of the second and third antiparallel beta strands. Previous studies have shown that the TFIIB zinc ribbon is essential for recruitment of Pol II into the preinitiation complex. In contrast, Pol III recruitment assays and in vitro transcription demonstrate that the disruption of the Brf zinc ribbon does not lead to a defect in Pol III recruitment but, rather, a defect in open complex formation. Therefore, the same conserved surface of the zinc ribbon domain has been adapted to serve distinct roles in the Pol II and Pol III transcription machinery.
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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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