Cdc13 is a Saccharomyces cerevisiae protein that binds to telomeric single-stranded DNA and regulates telomerase activity. Stnl has been shown by two-hybrid analysis to form a physical complex with Cdc13. Temperature-sensitive mutations in CDC13 and STN1, which are both essential genes, activate a DNA damage-dependent checkpoint which is the cause of the arrest seen in the mutant strains. The stn1-13 mutation induces dramatic telomere elongation which is telomerase dependent, as shown here. Additional mutants for STN1, which show a tighter arrest phenotype than stn1-13, were generated in order to perform genetic screens aiming at uncovering new regulators of telomerase. HSC82, which encodes a conserved molecular chaperone of the Hsp90 family, was thus isolated as a high-dosage suppressor of a temperature-sensitive mutation in STN1. Overexpression of HSC82 also partially suppressed the growth defect of cdc13-1 cells. Overexpression of HSC82 was found to correct the telomeric defect associated with stn1 mutations. Shortening of telomeres was also observed in wild-type cells upon overexpression of HSC82, or of its temperature-inducible homologue, HSP82. These results identify Hsc82/Hsp82 as potential regulators of telomerase in yeast cells.
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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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