FUI1 and function unknown now 26 (FUN26) are proteins of uncertain function with sequence similarities to members of the uracil/allantoin permease and equilibrative nucleoside transporter families of transporter proteins, respectively. [(3)H]Uridine influx was eliminated by disruption of the gene encoding FUI1 (fui1) and restored by expression of FUI1 cDNA, whereas influx in transport-competent and fui1-negative yeast were unaffected, respectively, by disruption of the FUN26 gene or overexpression of FUN26 cDNA. FUI1 transported uridine with high affinity (K(m), 22 +/- 3 micrometer) and was unaffected or inhibited only partially by high concentrations (1 mm) of a variety of ribo- and deoxyribonucleosides or nucleobases. When FUN26 cDNA was expressed in oocytes of Xenopus laevis, inward fluxes of [(3)H]uridine, [(3)H]adenosine, and [(3)H]cytidine were stimulated, and uridine influx was independent of pH and not inhibited by dilazep, dipyridamole, or nitrobenzylmercaptopurine ribonucleoside. Fractionation of yeast membranes containing immunotagged recombinant FUN26 (shown to be functional in oocytes) demonstrated that the protein was primarily in intracellular membranes. These results indicated that FUI1 has high selectivity for uracil-containing ribonucleosides and imports uridine across cell-surface membranes, whereas FUN26 has broad nucleoside selectivity and most likely functions to transport nucleosides across intracellular membranes.
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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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