The vacuolar H(+)-ATPase (V-ATPase) functions as a primary proton pump that generates an electrochemical gradient of protons across the membranes of several internal organelles. It is composed of distinct catalytic and membrane sectors, each containing several subunits. We identified a protein (M16) that copurifies with the V-ATPase complex from Saccharomyces cerevisiae and appears to be present at multiple copies/enzyme. Amino acid sequencing of its proteolytic products yielded three nonoverlapping peptide sequences matching an unidentified reading frame located on chromosome VIII. Sequence analysis of cDNA encoding M16 revealed that the gene encoding this protein (VMA10) is interrupted by a 162-nucleotide intron that begins after the ATG codon of the initiator methionine. The cDNA encodes an hydrophilic protein of 12,713 Da with a basic isoelectric point of pH 9. A delta vma10::URA3 null mutant exhibited growth characteristics typical of other vma disruptant mutants in genes encoding subunits of V-ATPase. The null mutant does not grow on medium buffered at pH 7.5. It fails to accumulate quinacrine into its vacuole, and subunits of the catalytic sector are not assembled onto the vacuolar membrane in the absence of M16. A cold inactivation experiment demonstrated that M16 is a subunit of the membrane sector of V-ATPase. M16 exhibits a significant sequence homology with subunit b of F-ATPase membrane sector.
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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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