The initiation of DNA replication in the budding yeast Saccharomyces cerevisiae occurs in two sequential and mutually exclusive steps. Prereplicative complexes (pre-RCs) containing origin recognition complex (ORC), Cdc6p, and the MCM2-7 proteins assemble only under conditions of low cyclin-dependent kinase (Cdk) activity during G(1), whereas origin activation is driven by the increase in Cdk activity at the end of G(1). As a first step toward the reconstitution of this two-step process in vitro, we describe a system in which extracts prepared from G(1)-arrested cells promote sequential assembly of ORC, Cdc6p, and MCM2-7 proteins onto exogenously added origin-containing DNA. This reaction requires an intact ARS consensus sequence and requires ATP for two distinct steps. Extracts from cells arrested in mitosis also can support the binding of ORC but are unable to load either Cdc6p or MCM2-7 proteins. This system should be useful for studying the mechanism and regulation of pre-RC assembly.
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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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