We identified a physical complex consisting of Mtw1p, an established kinetochore protein, with Nnf1p, Nsl1p and Dsn1p and have demonstrated that Nnf1p, Nsl1p and Dsn1p localize to the Saccharomyces cerevisiae kinetochore. When challenged prior to metaphase, the temperature-sensitive mutants nsl1-16 and nsl1-42 as well as Nsl1p-depleted cells failed to establish a bipolar spindle-kinetochore interaction and executed monopolar segregation of sister chromatids. In contrast, an nsl1-16 defect could not be evoked after the establishment of bipolarity. The observed phenotype is characteristic of that of mutants with defects in the protein kinase Ipl1p or components of the Dam-Duo kinetochore complex. However nsl1 mutants did not exhibit a defect in microtubule-kinetochore untethering as the ipl1-321 mutant does. Instead, they exhibited a severe defect in the kinetochore localization of the Dam-Duo complex suggesting this to be the cause for the failure of nsl1 cells to establish bipolarity. Moreover the analysis of Nsl1p-depleted cells indicated that Nsl1p is required for the spindle checkpoint and kinetochore integrity.
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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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| Evidence ID | Analyze ID | File | Description |
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