Cyclin-dependent protein kinases (Cdks) play key roles in regulating cell division and gene expression. Most Cdks require binding of a cyclin and phosphorylation by a Cdk-activating kinase (CAK) to be active. We report the identification of Civ1 (CAK in vivo), a novel CAK activity in S. cerevisiae. Civ1 is most similar in sequence to the Cdks, but unlike them is active as a monomer and may thus be the founding member of a novel family of kinases. Civ1 binds tightly to and phosphorylates Cdc28, thereby allowing its subsequent activation by the binding of a cyclin. The CIV1 gene is essential for yeast cell viability, and Cdc28 phosphorylation and activity are conditionally inhibited in a civ1-4 temperature-sensitive mutant. Civ1 is the only CAK for which there are genetic data indicating that its activity is physiologically relevant in vivo.
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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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