Rad17-Mec3-Ddc1 forms a proliferating cell nuclear antigen-like complex that is required for the DNA damage response in Saccharomyces cerevisiae and acts at an early step of the signal transduction cascade activated by DNA lesions. We used the mec3-dn allele, which causes a dominant negative checkpoint defect in G1 but not in G2, to test the stability of the complex in vivo and to correlate its assembly and disassembly with the mechanisms controlling checkpoint activation. Under physiological conditions, the mutant complex is formed both in G1 and G2, although the mutant phenotype is detectable only in G1, suggesting that is not the presence of the mutant complex per se to cause a checkpoint defect. Our data indicate that the Rad17-Mec3-Ddc1 complex is very stable, and it takes several hours to replace Mec3 with Mec3-dn within a wild type complex. On the other hand, the mutant complex is rapidly assembled when starting from a condition where the complex is not pre-assembled, indicating that the critical factor for the substitution is the disassembly step rather than complex formation. Moreover, the kinetics of mutant complex assembly, starting from conditions in which the wild type form is present, parallels the kinetics of checkpoint inactivation, suggesting that the complex acts in a stoichiometric way, rather than catalytically.
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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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