The LEU3 gene of the yeast Saccharomyces cerevisiae, which is involved in the regulation of at least two LEU structural genes (LEU1 and LEU2), has been cloned by complementation of leu3 mutations and shown to reside within a 5.6-kb fragment. Transformation of leu3 mutants with LEU3-carrying multicopy plasmids restored normal, leucine-independent growth behavior in the recipients. It also restored approximately wild-type levels of isopropylmalate isomerase (LEU1) and beta-isopropylmalate dehydrogenase (LEU2), which were strongly reduced when exogenous leucine was supplied. Strains containing a disrupted leu3 allele were constructed by deleting 0.7-kb of LEU3 DNA and inserting the yeast HIS3 gene in its place. Like other leu3 mutants, these strains were leaky leucine auxotrophs, owing to a basal level of expression of LEU1 and LEU2. Southern transfer and genetic analyses of strains carrying a disrupted leu3 allele demonstrated that the cloned gene was LEU3, as opposed to a suppressor. Disruption of LEU3 was performed also with a diploid and shown to be nonlethal by tetrad analysis. Northern transfer experiments showed that the LEU3 gene produces mRNA approximately 2.9 kilonucleotides in length. The leu3 marker was mapped to chromosome XII by the spo11 method. Linkage to ura4 by about 44 centiMorgans places leu3 on the right arm of this 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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