Cyclin-dependent kinases (CDKs) limit the activation of DNA replication origins to once per cell cycle by preventing the assembly of pre-replicative complexes (pre-RCs) during S, G2 and M phases of the cell cycle in the budding yeast Saccharomyces cerevisiae. CDKs inhibit each pre-RC component (ORC, Cdc6, Cdt1/Mcm2-7) by different mechanisms. We show here that the mitotic CDK, Clb2/Cdc28, binds tightly to an amino-terminal domain (NTD) of Cdc6, and that Cdc6 in this complex is unable to assemble pre-RCs. We present evidence indicating that this Clb2-dependent mechanism contributes to preventing re-replication in vivo. CDK interaction with the NTD of Cdc6 is mediated by the cyclin subunit Clb2, and could be reconstituted with recombinant Clb2 protein and synthetic NTD peptides. Tight Clb2 binding occurred only when the NTD was phosphorylated on CDK consensus sites. Human CDKs containing cyclins A, B and E also bound specifically to phospho-NTD peptides. We propose that direct binding of cyclins to phosphopeptide motifs may be a widespread phenomenon contributing to the targeting of CDKs to substrates.
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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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