In Saccharomyces cerevisiae strain 6-1G-P188 about 10 per cent of rRNA genes exist as extrachromosomal copies of rDNA repeating units. These extrachromosomal copies can be isolated as covalently closed molecules with lengths around 3mu. We have constructed a set of hybrid plasmids containing the bacterial vector pBR325, the LEU2 gene of yeast encoding beta-isopropylmalatedehydrogenase and various EcoRI restriction fragments of the 3mu DNA. We have tested the ability of our hybrid plasmids to transform LEU2 strain DC5 to leucine prototrophy. One of the plasmids Rcp21/11 transforms DC5 at the frequency comparable with that obtained with YEp13, containing the 2mu DNA replication origin. The 2400 bp EcoRI-B fragment of the 3mu DNA in Rcp21/11 carries a gene for 5S rRNA and two spacers. Our results on transformation experiments allow un to suggest that this EcoRI fragment also carries the 3mu DNA replication origin. Yeast transformants containing this plasmid are highly unstable but during the prolonged growth in selective conditions the stabilization of the LEU+ phenotype is observed being most likely a result of integration of Rcp21/11 into the yeast chromosome.
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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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