Ribonucleotide reductase activity has been measured during the course of one cell-division cycle in a synchronous culture of Saccharomyces cerevisiae. Enzyme activity was distinctly periodic, rising from an initial low level to a maximum early in the S phase, then declining at the end of this phase. The increase in ribonucleotide reductase activity began just prior to the onset of DNA synthesis and coincided with the appearance of buds on the yeast cells. Cycloheximide added at various times during the cell cycle blocked the increase (but not the decline) of ribonucleotide reductase activity; it also inhibited DNA synthesis and bud development. 5-Fluorouracil inhibited DNA synthesis and prevented bud maturation (but not initiation or growth); however, it stimulated an increase in ribonucleotide reductase activity for prolonged periods. Uracil reversed the inhibitory effects of fluorouracil, but not its enhancement of rihonucleotide reductase 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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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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