Saccharomyces cerevisiae strains bearing temperature-sensitive alleles of the cell division cycle gene CDC31 are specifically defective in duplication of the spindle pole body, the microtubule-organizing center of yeast. To define the function encoded by CDC31 more fully, we have isolated genomic clones of the gene by selection for complementation of a temperature-sensitive allele. The locus from which the clone was derived was marked by integration of a nutritional marker and found by meiotic mapping to cosegregate with CDC31. The polypeptide sequence of the open reading frame in the CDC31 gene was determined and compared with the sequences of other known proteins. This revealed significant homology with the calmodulins and other members of the Ca2+-binding protein family. On the basis of comparison with these related proteins, it is evident that the CDC31 gene product has at least two binding sites for Ca2+ and is also homologous with other regions of the calmodulin sequence. We propose that Ca2+ fluxes within the yeast cell play a key role in spindle pole body duplication and consequently in the organization of the microtubule arrays.
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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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