To operate as a rotary motor, the ATP-hydrolyzing domain of the vacuolar H(+)-ATPase must be connected to a fixed structure in its membrane-bound proton pump domain by a mechanical stator. Although low-resolution structural data and spectroscopic analysis indicate that a filament-like subunit E/subunit G heterodimer performs this role, more detailed information about the relative arrangement of these subunits is limited. We have used a site-directed cross-linking approach to show that, in both bacterial and yeast V-type ATPases, the N-terminal alpha-helical segments of the G and E subunits are closely aligned over a distance of up to 40 A. Furthermore, cross-linking coupled to mass spectrometry shows that the C-terminal end of G is anchored at the C-terminal globular domain of subunit E. These data are consistent with a stator model comprising two approximately 150 A long parallel alpha-helices linked to each other at both ends, stabilized by a coiled-coil arrangement and capped by the globular C-terminal domain of E that connects the cytoplasmic end of the helical structure to the V-ATPase catalytic domain.
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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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Evidence ID | Analyze ID | File | Description |
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