In the mammalian cell cycle, the transition from the G1 phase to S phase, in which DNA replication occurs, is dependent on tight cell size control and has been shown to be regulated by the cyclin-dependent kinases (Cdks) 2, 3, 4 and 6. Activities of Cdks are controlled by association with cyclins and reversible phosphorylation reactions. An additional level of regulation is provided by inhibitors of Cdks. G1-S and S phase substrates of these enzymes include proteins implicated in replication and transcription. Whereas the regulation and role of Cdk2, 4 and 6 has intensively been studied, less is known about Cdk3. Recent data provide first insights into the regulation of Cdk3-associate kinase activity and suggest a model how Cdk3 participates in the regulation of the G1-S transition. Although it has been shown that these G1-Cdks are absolutely essential for a proper transition into S phase, their physiological activation is not sufficient to directly initiate replication independently of cell size. Evidence obtained from yeast and Xenopus indicate the initiation of DNA replication to be a two-step process: the origin recognition complex, Cdc6 and Mcm proteins are required for establishing the prereplicative complex and the activities of Cdks and of Cdc7 kinase then trigger the G1-S transition. Recent findings provide evidence that the overall mechanism of initiation of replication is conserved in mammalian cells.
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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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