Ran, a Ras-like GTPase, has been implicated in controlling the movement of proteins and RNAs in and out of the nucleus. We have constructed strains of Saccharomyces cerevisiae which produce fusion proteins containing glutathione-S-transferase (GST) fused to Gsp1p, which encodes the essential yeast Ran homolog, and a mutant form of Gsp1p that mimics the GTP-bound state. A major protein with the apparent size of 34 kDa co-purifies with the GTP-bound form of Gsp1p. This protein was identified as Yrb1p (Yeast Ran Binding Protein) and stimulates GTP hydrolysis by Gsp1p in the presence of Rna1p, the Gsp1 GTPase activating protein. Yrb1p is located in the cytoplasm with some concentration at the nuclear periphery. Temperature-sensitive yrb1 mutants are defective in nuclear protein import and RNA export. A mutation in the highly conserved Ran binding region of Yrb1p reduces its ability to interact with Gsp1p. These data indicate that Yrb1p functions with Gsp1p and suggest that together they can control transport of macromolecules across the nuclear envelope.
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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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