The Saccharomyces cerevisiae Orc2 protein is a subunit of the origin recognition complex, ORC, which binds in a sequence-specific manner to yeast origins of DNA replication. With screens for orc2-1 synthetic lethal mutations and Orc2p two-hybrid interactors, a novel Orc2p-associated factor (Oaf1p) was identified. OAF1 is essential, its gene product is localized to the nucleus, and an oaf1 temperature-sensitive mutant arrests as large budded cells with a single nucleus. The mutant oaf1-2, isolated in the synthetic lethal screen, loses plasmids containing a single origin of DNA replication at a high rate, but it maintains plasmids carrying multiple potential origins of DNA replication. In addition, the OAF1 gene product tagged with the hemagglutinin antigen epitope binds to a DNA affinity column containing covalently linked tandem repeats of an essential origin element. These results suggest a role for OAFI in the initiation of DNA replication. Mutant alleles of cdc7 and cdc14 were also isolated in the orc2-1 synthetic lethal screen. Cdc7p, like Oaf1p, also interacts with Orc2p in two-hybrid assays.
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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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