SPK1/RAD53/SAD1/MEC2 encodes an essential protein kinase of Saccharomyces cerevisiae and is required for the execution of checkpoint arrest at multiple stages of the cell cycle. We have isolated two mutant alleles of SPK1 (spk1K227A and spk1-1A208P) that are defective for checkpoint-arrest functions but retain wild-type levels of SPK1-associated growth activity. Both mutations occur within conserved regions of the kinase domain of SPK1 resulting in a substantial reduction in the catalytic activity of Spk1. Thus, while minimal levels of Spk1 kinase activity are capable of supporting normal rates of growth, higher levels are required for checkpoint functions. In addition, using deletional analysis we have identified a region within the N-terminus of Spk1 outside of the conserved kinase domain that is required for checkpoint functions. Interestingly, this region may be important in the regulation of Spk1 kinase activity.
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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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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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