We find budding yeast Rad9 in two distinct, large, and soluble complexes in cell extracts. The larger (> or =850 kDa) complex, found in nondamaged cells, contains hypophosphorylated Rad9, whereas the smaller (560 kDa) complex, which forms after DNA damage, contains hyperphosphorylated Rad9 and Rad53. This smaller Rad9 complex is capable of catalyzing phosphorylation and release of active Rad53 kinase, a process requiring the kinase activity of Rad53. However, Mec1 and Tel1 are no longer required once the 560 kDa complex has been formed. We propose a model whereby Mec1/Tel1-dependent hyperphosphorylation of Rad9 results in formation of the smaller Rad9 complex and recruitment of Rad53. This complex then catalyzes activation of Rad53 by acting as a scaffold that brings Rad53 molecules into close proximity, facilitating Rad53 in trans autophosphorylation and subsequent release of activated Rad53.
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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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