Saccharomyces cerevisiae Rad17p is necessary for cell cycle checkpoint arrests in response to DNA damage. Its known interactions with the checkpoint proteins Mec3p and Ddc1p in a PCNA-like complex indicate a sensor role in damage recognition. In a novel application of the yeast two-hybrid system and by immunoprecipitation, we show here that Rad17p is capable of increased self-interaction following DNA damage introduced by 4-nitroquinoline-N-oxide, camptothecin or partial inactivation of DNA ligase I. Despite overlap of regions required for Rad17p interactions with Rad17p or Mec3p, single amino acid substitutions revealed that Rad17p x Rad17p complex formation is independent of Mec3p. E128K (rad17-1) was found to inhibit Rad17p interaction with Mec3p but not with Rad17p. On the other hand, Phe-121 is essential for Rad17p self-interaction, and its function in checkpoint arrest but not for Mec3p interaction. These differential effects indicate that Rad17p-Rad17p interaction plays a role that is independent of the Rad17p x Mec3p x Ddc1p complex, although our results are also compatible with Rad17p-mediated supercomplex formation of the Rad17p x Mec3p x Ddc1p heterotrimer in response to DNA damage.
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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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