In a screening for small-molecule compounds that alleviate the deleterious effects of external CaCl(2) on zds1 Delta strain yeast, we found 2-((1-(hydroxymethyl) cyclohexyl) methyl) naphthalen-1-ol (NKH-7) to be an active compound. NKH-7 also inhibited cell growth at higher concentrations. To identify its target in growth inhibition, we isolated NKH-7-resistant mutants and selected those mutants that exhibited dominant or semi-dominant resistance specifically to NKH-7. By gene cloning, a TUB1 mutant gene encoding alpha-tubulin with a Ser248Pro mutation was identified. Deletion of the TUB3 gene, a minor gene encoding alpha-tubulin, led to supersensitivity to NKH-7. Cellular tubulin-containing arrays as visualized by green fluorescent protein (GFP)-labeled alpha-tubulin diminished rapidly on exposure to the inhibitor. The mutation was situated proximal to the alpha-beta interface of alpha-tubulin in microtubule protofilaments, suggesting the possibility that NKH-7 affects the hydrolysis of GTP bound to beta-tubulin. A functional connection perhaps exists between the tubulin inhibition and Ca(2+)-dependent cell-cycle regulation.
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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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