8-Azidoadenine was used as a photoaffinity reagent to characterize the purine-cytosine permease of Saccharomyces cerevisiae. It is a potent competitive inhibitor of cytosine uptake and irradiation of the cells incubated with the label induced the irreversible inactivation of cytosine uptake. Addition of excess cytosine prevented this labelling which was restricted to the outer face of the plasma membrane since it was not accumulated by the cells. In the strain with the amplified purine-cytosine permease gene the maximum cytosine uptake rate was increased 4-5-fold relative to wild type without a modification of the Michaelis constant of uptake (Kt); no uptake could be measured in the deleted strain. The relative amounts of specific labelling determined for the cells and for membrane preparations were 0, 1 and 4 for the null, the wild-type and the amplified strains, respectively. One major band specifically labelled by [3H]azidoadenine, corresponding to a polypeptide with an apparent molecular mass of 45 kDa, was observed in the wild type, amplified in the strain carrying the multicopy plasmid and not detected in the deleted strain. Therefore this polypeptide corresponds to the purine-cytosine permease.
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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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