Fructose-1,6-bisphosphatase (FBPase) is targeted to the vacuole for degradation when Saccharomyces cerevisiae are shifted from low to high glucose. Before vacuolar import, however, FBPase is sequestered inside a novel type of vesicle, the vacuole import and degradation (Vid) vesicles. Here, we reconstitute import of FBPase into isolated Vid vesicles. FBPase sequestration into Vid vesicles required ATP and cytosol, but was inhibited if ATP binding proteins were depleted from the cytosol. The heat shock protein Ssa2p was identified as one of the ATP binding proteins involved in FBPase import. A Deltassa2 strain exhibited a significant decrease in the rate of FBPase degradation in vivo as compared with Deltassa1, Deltassa3, or Deltassa4 strains. Likewise, in vitro import was impaired for the Deltassa2 strain, but not for the other Deltassa strains. The cytosol was identified as the site of the Deltassa2 defect; Deltassa2 cytosol did not stimulate FBPase import into import competent Vid vesicles, but wild-type cytosol supported FBPase import into competent Deltassa2 vesicles. The addition of purified recombinant Ssa2p stimulated FBPase import into Deltassa2 Vid vesicles, providing Deltassa2 cytosol was present. Thus, Ssa2p, as well as other undefined cytosolic proteins are required for the import of FBPase into vesicles.
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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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Evidence ID | Analyze ID | File | Description |
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