In this study, we mutated autophosphorylation sites in Rad53 based on their conservation with previously identified autophosphorylation sites in the mammalian Rad53 ortholog, Chk2. As with wild-type Rad53, the autophosphorylation mutant, rad53-TA, undergoes Mec1/Tel1-dependent interactions with Rad9 and Dun1 in response to genotoxic stress. Whereas rad53-TA in vitro kinase activity is severely impaired, the rad53-TA strains are not completely deficient for cell-cycle checkpoint functions, indicating that the mutant kinase retains a basal level of function. We describe a genetic interaction among Rad53, Dun1, and the 14-3-3 proteins Bmh1 and Bmh2 and present evidence that 14-3-3 proteins directly facilitate Rad53 function in vivo. The data presented account for the previously observed checkpoint defects associated with 14-3-3 mutants in Saccharomyces pombe and Saccharomyces cerevisiae. The 14-3-3 functional interaction appears to modulate Rad53 activity, reminiscent of 14-3-3's effect on human Raf1 kinase and distinct from the indirect mode of regulation by 14-3-3 observed for Chk1 or Cdc25.
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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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Evidence ID | Analyze ID | File | Description |
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