The CDC45 gene of Saccharomyces cerevisiae was isolated by complementation of the cold-sensitive cdc45-1 mutant and shown to be essential for cell viability. Although CDC45 genetically interacts with a group of MCM genes (CDC46, CDC47, and CDC54), the predicted sequence of its protein product reveals no significant sequence similarity to any known Mcm family member. Further genetic characterization of the cdc45-1 mutant demonstrated that it is synthetically lethal with orc2-1, mcm2-1, and mcm3-1. These results not only reveal a functional connection between the origin recognition complex (ORC) and Cdc45p but also extend the CDC45-MCM genetic interaction to all known MCM family members that were shown to be involved in replication initiation. Initiation of DNA replication in cdc45-1 cells was defective, causing a delayed entry into S phase at the nonpermissive temperature, as well as a high plasmid loss rate which could be suppressed by tandem copies of replication origins. Furthermore, two-dimensional gels directly showed that chromosomal origins fired less frequently in cdc45-1 cells at the nonpermissive temperature. These findings suggest that Cdc45p, ORC, and Mcm proteins act in concert for replication initiation throughout the genome.
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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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