The yeast regulatory gene CAT3 has an essential function for the depression of several glucose-repressible enzymes. Therefore, cat3 mutants are unable to grow on maltose or on non-fermentable carbon sources. Unlike the point mutants isolated previously, cat3 null allele strains also failed to utilize raffinose or galactose as sole carbon sources. Sequencing of an 1.6-kb HindIII-BglII fragment complementing cat3 mutations revealed an open reading frame of 322 codons, size of which is in good agreement with the 1.3-kb size of mRNA. No significant similarities with previously sequenced genes could be detected. CAT3-lacZ fusions confirmed the proposed reading frame. A CAT3-lacZ fusion encoding 307 amino acids of CAT3 was able to complement the growth defects of cat3 point mutants and null allele strains. Assay of beta-galactosidase activity under different growth conditions indicated a constitutive expression of the CAT3 gene product. Cellular fractionation studies showed the nuclear localization of the CAT3 protein.
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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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