Acidification inside vacuoles has been shown to play a key role in a number of physiologically important cellular events. We studied the role of vacuolar membrane H(+)-ATPase in the autophagic process of Saccharomyces cerevisiae. Mutants lacking VMA genes which encode their subunits of the vacuolar H(+)-ATPase accumulated autophagic bodies in vacuoles on starvation. vma mutants also had a defect in protein degradation induced by starvation. In vma mutants, the activities of vacuolar proteases were remarkably lower than those of the wild-type. Overexpression of vacuolar proteases did not overcome the defect in the disintegration of autophagic bodies in vma mutant, even the overexpressed proteinase A and proteinase B being substantially localized to the vacuolar compartment and undergoing proper proteolytic maturation. Our results showed that the acidification of vacuoles is not required for the formation and delivery of autophagosomes to vacuoles, but is essential for the disintegration of autophagic bodies.
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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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