Zymocin, a toxic protein complex produced by Kluyveromyces lactis, inhibits cell cycle progression in Saccharomyces cerevisiae. In studying its action, a resistant mutant ( kti14-1) was found to express the tot-phenotype typical of totDelta cells, toxin target (TOT) mutants that are impaired in RNA polymerase II Elongator function. Phenotypic analysis of a kti14-1 tot3Delta double mutant revealed a functional link between KTI14 and TOT/Elongator. Unlike totDelta cells, the kti14-1 mutant is sensitive to the drug methylmethane sulfonate (MMS), indicating that, besides being affected in TOT function, kti14-1 cells are also compromised in DNA repair. Single-copy complementation identified HRR25, which codes for casein kinase I (CKI), as KTI14. Kinase-minus hrr25 mutations (K38A and T176I) conferred zymocin resistance, while deletion of the other yeast CKI genes ( YCK1-3) had no effect. A mutation in KTI14 that truncates the P/Q-rich C-terminus of Hrr25p also dissociates MMS sensitivity from zymocin resistance; this mutant is resistant to the toxin, but shows normal sensitivity to MMS. Thus, although kinase-minus mutations are sufficient to protect yeast cells from zymocin, toxicity is also dependent on the integrity of the C-terminal region of Hrr25p, which has been implicated in determining the substrate specificity or localization of Hrr25p.
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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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