The Flp recombinase of the 2 micron plasmid of Saccharomyces cerevisiae binds to a recognition target site, induces DNA bending and catalyses DNA cleavage and strand exchange to bring about recombination. The minimal Flp recognition target site contains two Flp binding sequences flanking an 8 bp core region; binding of Flp results in the formation of two Flp:DNA complexes (complexes I and II). Binding of a Flp monomer to a single symmetry element generates a DNA bend of about 60 degrees (a type I bend), whereas binding of two Flp monomers to the FRT site generates a DNA bend of > 144 degrees (a type II bend). We have used circular permutation analysis to locate the centre of the type I and type II DNA bends induced by Flp, and the Flp peptides P27 (27 kDa; amino acid residues 124 to 346) and P32 (32 kDa; amino acid residues 124 to 423). The location of the centre of the type I bend depends upon whether the substrate contains one or two Flp binding elements. When the substrate contains one symmetry element, the centre of the type I bend induced by Flp is located at the core-distal end of the b element. However, it is located at the core-proximal end of the b element when the substrate contains two Flp-binding elements. The P27 and P32 peptides, which lack the NH2-terminal 13 kDa region of Flp, do not show this behaviour. We deduce that the 13 kDa region of Flp is critical for the positioning of the type I bend centre on a minimal Flp recognition site. We propose a model in which a single molecule of Flp interacts with two symmetry elements to account for these results. The centre of the type II bend induced by Flp is in the middle of the core region. We used ligation-defective Flp proteins to determine the location of the type II bend centres in complexes where either the top or bottom strand was cleaved. The bend centres of such complexes depend upon which strand is cleaved. We propose a model which associates the position of Flp-induced type II bends with a defined order of strand exchanges in the recombination reaction.
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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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