Using a combination of DNA and hybrid DNA-RNA substrates, we have analyzed the mechanism of phosphoryl transfer by the Flp site-specific recombinase in three different reactions: DNA strand breakage and joining, and two types of RNA cleavage activities. These reactions were then used to characterize Flp variants altered at His309 and His345, amino acid residues that are in close proximity to two key catalytic residues (Arg308 and Tyr343). These histidine residues are important for strand cutting by Tyr343, the active-site nucleophile of Flp, but neither residue contributes to the type II RNA cleavage activity or to the strand-joining reaction in a pre-cleaved substrate. Strand cleavage reactions using small, diffusible nucleophiles indicate that this histidine pair contributes to the correct positioning and activation of Tyr343 within the shared active site of Flp. The implications of these results are evaluated against the recently solved crystal structure of Flp in association with a Holliday junction.
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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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