The yeast cwh36Delta mutant was identified in a screen for yeast mutants exhibiting a Vma(-) phenotype suggestive of loss of vacuolar proton-translocating ATPase (V-ATPase) activity. The mutation disrupts two genes, CWH36 and a recently identified open reading frame on the opposite strand, YCL005W-A. We demonstrate that disruption of YCL005W-A is entirely responsible for the Vma(-) growth phenotype of the cwh36Delta mutant. YCL005W-A encodes a homolog of proteins associated with the Manduca sexta and bovine chromaffin granule V-ATPase. The functional significance of these proteins for V-ATPase activity had not been tested, but we show that the protein encoded by YCL005W-A, which we call Vma9p, is essential for V-ATPase activity in yeast. Vma9p is localized to the vacuole but fails to reach the vacuole in a mutant lacking one of the integral membrane subunits of the V-ATPase. Vma9p is associated with the yeast V-ATPase complex in vacuolar membranes, as demonstrated by co-immunoprecipitation with known V-ATPase subunits and glycerol gradient fractionation of solubilized vacuolar membranes. Based on this evidence, we propose that Vma9p is a genuine subunit of the yeast V-ATPase and that e subunits may be a functionally essential part of all eukaryotic V-ATPases.
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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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