The kinetics of recombinational repair of plasmid DNA double-strand breaks (dsb) and gaps (dsg) of different sizes and ends were studied. For this purpose we used the mutant rad54-3 of the yeast Saccharomyces cerevisiae, which is temperature dependent with respect to genetic recombination and rejoining of dsb/dsg, allowing us to stop these processes by shifting cells to the restrictive temperature. We found that the kinetics of repair of cohesive-ended dsb and small gaps (up to 400 bp) are similar and characterized by two phases separated by a plateau. In contrast, large gap (1.4 kbp) repair proceeds with different kinetics exhibiting only the second phase. We also investigated the repair kinetics of 400 bp gaps introduced into plasmid DNA with and without homology to chromosomal DNA allowing recombinational repair and non-recombinational repair (ligation), respectively. We found that gaps introduced in plasmid sequences homologous to chromosomal DNA are rapidly repaired by recombination. In contrast, recircularization of the gapped plasmid by ligation is as slow and inefficient as ligation of a cohesive-ended dsb. The kinetics of repair of gapped plasmids may be explained by assuming a constitutive level of enzymes responsible for the first phase of recombinational repair, while inducible enzymes, which become available at the end of the plateau, carry out the second phase of repair.
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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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