The activities of the first three enzymes for galactose catabolism normally become detectable within 15 min after the addition of galactose into a culture of the yeast Saccharomyces cerevisiae. In S. cerevisiae with a recessive mutation termed gal3, a longer-than-normal lag is observed before the appearance of the enzyme activities (O. Winge and C. Roberts, C. R. Trav. Lab. Carlsberg Ser. Physiol. 24:263-315, 1948). I isolated two S. cerevisiae mutants with temperature-sensitive defects in the GAL3 gene. Temperature shift experiments with one of those mutants led to the conclusion that the GAL3 function is required not only for the initiation of enzyme induction but also for the maintenance of the induced state in galactose-nonfermenting S. cerevisiae because of a defect in any of the genes for the galactose-catabolizing enzymes, such as gal1 or gal10. In contrast, the GAL3 function is phenotypically dispensable in galactose-metabolizing S. cerevisiae. Thus, the normal catabolism of galactose can substitute for the GAL3 function.
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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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