Mutants at the ade4 locus of yeast were isolated following mutagenesis of ade+ and ade2 with ultraviolet light (UV), ethylmethane sulphonate, and the acridine half mustard ICR-170. Tests for interallelic complementation, osmotic remediality, temperature sensitivity, and mutagen-specific reversion were carried out on 19 mutants. Six mutants showed interallelic complementation and fell into four groups, defining three complons. Three mutants were osmotic remedial and the same three were temperature sensitive. Three mutants induced by ICR-170 gave purine-excreting revertants, designated Pur6 or ade4.RCF, after exposure to UV. Activity of amidophosphoribosyltransferase (PRPPAT) was assayed in the ade4 mutants and other alleles at this locus. The ade4 mutants lacked activity of the enzyme; the alleles su-pur+, su-pur, PUR6, and Pur6, showed different levels of activity. The enzyme was subject to feedback inhibition by AMP and IMP in su-pur+ and PUR6; su-pur was hypersensitive to inhibition by AMP, whereas Pur6 was slightly resistant. Purine synthesis de novo was shown to be repressible in su-pur+ and constitutive in PUR6 and Pur6 by following the accumulation of aminoimidazole ribotide in the presence and absence of cycloheximide. These observations were confirmed by direct assay of enzyme activity.
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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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