The vacuolar H(+)-ATPase (V-ATPase) is a multisubunit complex composed of two sectors: V(1), a peripheral membrane sector responsible for ATP hydrolysis, and V(0), an integral membrane sector that forms a proton pore. Vma5p and Vma13p are V(1) sector subunits that have been implicated in the structural and functional coupling of the V-ATPase. Cells overexpressing Vma5p and Vma13p demonstrate a classic Vma(-) growth phenotype. Closer biochemical examination of Vma13p-overproducing strains revealed a functionally uncoupled V-ATPase in vacuolar vesicles. The ATP hydrolysis rate was 72% of the wild-type rate; but there was no proton translocation, and two V(1) subunits (Vma4p and Vma8p) were present at lower levels. Vma5p overproduction moderately affected both V-ATPase activity and proton translocation without affecting enzyme assembly. High level overexpression of Vma5p and Vma13p was lethal even in wild-type cells. In the absence of an intact V(0) sector, overproduction of Vma5p and Vma13p had a more detrimental effect on growth than their deletion. Overproduced Vma5p associated with cytosolic V(1) complexes; this association may cause the lethality.
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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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