A mutation has been identified that prevents Saccharomyces cerevisiae cells from growing on proline as the sole source of nitrogen, causes noninducible expression of the PUT1 and PUT2 genes, and is completely recessive. In the put3-75 mutant, the basal level of expression (ammonia as nitrogen source) of PUT1-lacZ and PUT2-lacZ gene fusions as measured by beta-galactosidase activity is reduced 4- and 7-fold, respectively, compared with the wild-type strain. Normal regulation is not restored when the cells are grown on arginine as the sole nitrogen source and put3-75 cells remain sensitive to the proline analog, L-azetidine-2-carboxylic acid, indicating that the block is not at the level of transport of the inducer, proline. In a cross between the put3-75 strain and the semidominant, constitutive mutation PUT3c-68, only parental ditype tetrads were found, indicating allelism of the two mutations. Further support for allelism derives from the comparison of enzyme levels in heteroallelic and heterozygous diploid strains. The constitutive allele appears to be fully dominant to the noninducible allele but only partially dominant to the wild type, suggesting an interaction between the wild-type and PUT3c-68 gene products. The PUT3 gene maps on chromosome XI, about 5.7 cM from the centromere. The phenotypes of alleles of the PUT3 gene, either recessive and noninducible (the put3-75 phenotype) or semidominant and constitutive (the PUT3c-68 phenotype), and their pleiotropy suggest that the PUT3 gene product is a positive activator of the proline utilization pathway.
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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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