The efficient separation of two equal DNA masses to the daughter cells is an essential step in mitosis. This process is dependent upon the removal of any remaining recombination or replication intermediates that link sister chromatids, and a failure to resolve these intermediates leads to genome instability. Similarly, a failure to resolve meiotic recombination intermediates that link homologous chromosomes can cause chromosome nondisjunction and aneuploidy. Cleavage of these potentially toxic replication/recombination intermediates requires the Mus81 endonuclease, which is active upon flaps, forks, and more complex secondary structures in DNA such as Holliday junctions. Recent studies of Mus81 revealed that it is regulated throughout the cell cycle: Mus81 activity is controlled in S-phase to limit the cleavage of replication fork structures, whereas it is activated at G2/M to ensure the cleavage of recombination and late replication intermediates. In this chapter, we describe a simple method that can monitor the activity of Mus81, which involves the immunoprecipitation of epitope-tagged Mus81 and use of an on-bead assay for nuclease activity.
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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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