The peripheral (catalytic) sector of vacuolar H+-ATPases contains five different polypeptides denoted as subunits A-E in order of decreasing molecular masses from 72 to 33 kDa. The gene encoding subunit B (57 kDa) of yeast vacuolar H+-ATPase was cloned on a 5-kilobase pair genomic DNA fragment and sequenced. Four open reading frames were identified in the sequenced DNA. One of them encodes a protein of 504 amino acids with a calculated Mr of 56,557. Hydropathy plot revealed no apparent transmembrane segments. Southern analysis demonstrated that a single gene encodes this polypeptide in the yeast genome. The amino acid sequence exhibits extensive identity with the homologous protein from the plant Arabidopsis (77%). This polypeptide also contains regions of homology with the alpha subunits of H+-ATPases from mitochondria, chloroplasts, and bacteria. However, less similarity was detected when it was compared with the beta subunits of those enzymes. The implication of these phenomena on the evolution of proton pumps is discussed.
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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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