The assembly of cytoskeletal structures is coupled to other cellular processes. We have studied the molecular mechanism by which assembly of the yeast septin cytoskeleton is monitored and coordinated with cell cycle progression by analyzing a key regulatory protein kinase, Hsl1, that becomes activated only when the septin cytoskeleton is properly assembled. We first identified a regulatory region of Hsl1 that physically associates with the kinase domain and found that it performs an autoinhibitory function both in vivo and in vitro. Several septin binding domains lie near and overlap the inhibitory domain; these are important for Hsl1 function, and binding of two septins, Cdc11 and Cdc12, relieves the autoinhibition imposed by the kinase inhibitory domain in vitro. Our results suggest that binding to multiple septins activates Hsl1 kinase activity, thereby promoting cell cycle progression. The high conservation of Hsl1 indicates that similar mechanisms may monitor cytoskeletal organization in other eukaryotes.
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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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