When glucose is added to yeast cells that are starved for 3 days, fructose-1,6-bisphosphatase (FBPase) and malate dehydrogenase 2 are degraded in the vacuole via the vacuole import and degradation (Vid) pathway. In this study, we examined the distribution of FBPase at the ultrastructural level. FBPase was observed in areas close to the plasma membrane and in cytoplasmic structures that are heterogeneous in size and density. We have isolated these intracellular structures that contain FBPase, the Vid vesicle marker Vid24p, and the endosomal marker Pep12p. They appeared irregular in size and shape. In yeast, actin polymerization plays an important role in early steps of endocytosis. Mutants that affect actin polymerization inhibited FBPase degradation, suggesting that actin polymerization is important for FBPase degradation. Both FBPase and malate dehydrogenase 2 were associated with actin patches. Vid vesicle proteins such as Vid24p or Sec28p were also at actin patches, although they dissociated from these structures at later time points. We propose that Vid24p and Sec28p are present at actin patches during glucose starvation. Cargo proteins arrive at these sites following the addition of glucose, and the endocytic vesicles then pinch off from the plasma membrane. Following the fusion of endosomes with the vacuole, cargo proteins are then degraded in the vacuole.
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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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