The Cdc7p protein kinase in the budding yeast Saccharomyces cerevisiae is thought to help trigger DNA replication by modifying one or more of the factors that assemble at replication origins (ARSs). To investigate events catalyzed by Cdc7p, we compared the structure of replication origins in cells containing conditional mutations in Cdc7p and Cdc8p, a thymidylate kinase that is required for DNA synthesis. High resolution genomic footprinting indicated that the presumptive lagging strand template in ARS1 became highly sensitive to KMnO(4) modification after the CDC7 execution point. These results suggested that Cdc7p triggers DNA unwinding. The transition from late G(1) phase to the CDC7 execution point and from the CDC7 to the CDC8 execution points was accompanied by small but ARS-dependent changes in DNA topology. These results suggested that DNA unwinding before the CDC8 execution point either is highly localized or that the torsional stress associated with initial DNA unwinding is minimized by compensatory protein-DNA structural changes. The ARS DNA structural attributes evident in cells blocked at the CDC8 execution point were also evident in alpha-factor-blocked, G(1) phase cells containing the CDC7 bypass mutant mcm5/cdc46-bob1. This result strongly suggests that the structural changes during the transition from the CDC7 to CDC8 execution points depend on the Cdc7p protein kinase and involve alteration of the minichromosome maintenance protein complex.
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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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