Spindle morphogenesis is regulated by cyclin-dependent kinases and monitored by checkpoint pathways to accurately coordinate chromosomal segregation with other events in the cell cycle. We have previously dissected the contribution of individual B-type cyclins to spindle morphogenesis in Saccharomyces cerevisiae. We showed that the S-phase cyclin Clb5p is required for coupling spindle assembly and orientation. Loss of Clb5p-dependent kinase abolishes intrinsic asymmetry between the spindle poles resulting in lethal translocation of the spindle into the bud with high penetrance in diploid cells. This phenotype was exploited in a screen for high dosage suppressors that yielded spc110(Delta)(13), encoding a truncation of the spindle pole body component Spc110p (the intranuclear receptor for the gamma-tubulin complex). We found that Clb5p-GFP was localised to the spindle poles and intranuclear microtubules and that Clb5p-dependent kinase promoted cell cycle dependent phosphorylation of Spc110p contributing to spindle integrity. Two cyclin-dependent kinase consensus sites were required for this phosphorylation and were critical for the activity of spc110(Delta)(13) as a suppressor. Together, our results point to the function of cyclin-dependent kinase phosphorylation of Spc110p and provide, in addition, support to a model for Clb5p control of spindle polarity at the level of astral microtubule organisation.
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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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