Stu1p is a microtubule-associated protein required for spindle assembly. In this article we show that the temperature-sensitive stu1-5 allele is synthetically lethal in combination with ubp3, gim1-gim5, and kem1 mutations. The primary focus of this article is on the stu1-5 ubp3 interaction. Ubp3 is a deubiquitination enzyme and a member of a large family of cysteine proteases that cleave ubiquitin moieties from protein substrates. UBP3 is the only one of 16 UBP genes in yeast whose loss is synthetically lethal with stu1-5. Stu1p levels in stu1-5 cells are several-fold lower than the levels in wild-type cells and the stu1-5 temperature sensitivity can be rescued by additional copies of stu1-5. These results indicate that the primary effect of the stu1-5 mutation is to make the protein less stable. The levels of Stu1p are even lower in ubp3Delta stu1-5 cells, suggesting that Ubp3p plays a role in promoting protein stability. We also found that ubp3Delta produces growth defects in combination with mutations in other genes that decrease protein stability. Overall, these data support the idea that Ubp3p has a general role in the reversal of protein ubiquitination.
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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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