Saccharomyces cerevisiae Rad53 is a protein kinase central to the DNA damage and DNA replication checkpoint signaling pathways. In addition to its catalytic domain, Rad53 contains two forkhead homology-associated (FHA) domains (FHA1 and FHA2), which are phosphopeptide binding domains. The Rad53 FHA domains are proposed to mediate the interaction of Rad53 with both upstream and downstream branches of the DNA checkpoint signaling pathways. Here we show that concurrent mutation of Rad53 FHA1 and FHA2 causes DNA checkpoint defects approaching that of inactivation or loss of RAD53 itself. Both FHA1 and FHA2 are required for the robust activation of Rad53 by the RAD9-dependent DNA damage checkpoint pathway, while an intact FHA1 or FHA2 allows the activation of Rad53 in response to replication block. Mutation of Rad53 FHA1 causes the persistent activation of the RAD9-dependent DNA damage checkpoint pathway in response to replicational stress, suggesting that the RAD53-dependent stabilization of stalled replication forks functions through FHA1. Rad53 FHA1 is also required for the phosphorylation-dependent association of Rad53 with the chromatin assembly factor Asf1, although Asf1 itself is apparently not required for the prevention of DNA damage in response to replication block.
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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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