SGS1 encodes a protein having DNA helicase activity, and a mutant allele of SGS1 was identified as a suppressor of the slow growth phenotype of top3 mutants. In this study, we examined whether Sgs1 prevents formation of DNA double strand breaks (DSBs) or is involved in DSB repair following exposure to methyl methanesulfonate (MMS). An analysis by pulsed-field gel electrophoresis and epistasis analyses indicated that Sgs1 is required for DSB repair that involves Rad52. In addition, analyses on the relationship between Sgs1 and proteins involved in DSB repair suggested that Sgs1 and Mre11 function via independent pathways both of which require Rad52. In sgs1 mutants, interchromosomal heteroallelic recombination and sister chromatid recombination (SCR) were not induced upon exposure to MMS, though both were induced in wild type cells, indicating the involvement of Sgs1 in heteroallelic recombination and SCR. Surprisingly, the ability of Sgs1 to bind to DNA topoisomerase III (Top3) was absolutely required for the induction of heteroallelic recombination and SCR and suppression of MMS sensitivity but its helicase activity was not, suggesting that Top3 plays a more important role in both recombinations than the DNA helicase activity of Sgs1.
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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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