One challenge facing eukaryotic cells is the post-translational import of proteins into organelles. This problem is exacerbated when the proteins assemble into large complexes. Aminopeptidase I (API) is a resident hydrolase of the vacuole/lysosome in the yeast Saccharomyces cerevisiae. The precursor form of API assembles into a dodecamer in the cytosol and maintains this oligomeric form during the import process. Vacuolar delivery of the precursor form of API requires a vesicular mechanism termed the cytoplasm to vacuole targeting (Cvt) pathway. Many components of the Cvt pathway are also used in the degradative autophagy pathway. alpha-Mannosidase (Ams1) is another resident hydrolase that enters the vacuole independent of the secretory pathway; however, its mechanism of vacuolar delivery has not been established. We show vacuolar localization of Ams1 is blocked in mutants that are defective in the Cvt and autophagy pathways. We have found that Ams1 forms an oligomer in the cytoplasm. The oligomeric form of Ams1 is also detected in subvacuolar vesicles in strains that are blocked in vesicle breakdown, indicating that it retains its oligomeric form during the import process. These results identify Ams1 as a second biosynthetic cargo protein of the Cvt and autophagy pathways.
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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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