Disassembly of the yeast V-ATPase into cytosolic V1 and membrane V0 sectors inactivates MgATPase activity of the V1-ATPase. This inactivation requires the V1 H subunit (Parra et al (2000) J. Biol. Chem. 275:21761-7), but its mechanism is not fully understood. The H subunit has two domains. Interactions of each domain with V1 and Vo subunits were identified by two-hybrid assay. The B subunit of the V1 catalytic headgroup interacted with the H subunit N-terminal domain (H-NT), but the C-terminal domain (H-CT) interacted with V1 subunits B, E (peripheral stalk), and D (central stalk), and the cytosolic N-terminal domain of V0 subunit Vph1p. V1-ATPase complexes from yeast expressing H-NT are partially inhibited, exhibiting 26% the MgATPase activity of complexes with no H subunit. The H-CT domain does not copurify with V1 when expressed in yeast, but the bacterially expressed and purified H-CT domain inhibits MgATPase activity in V1 lacking H almost as well as the full-length H subunit. Binding of full-length H subunit to V1 was more stable than binding of either H-NT or H-CT, suggesting that both domains contribute to binding and inhibition. Intact H and H-CT can bind to the expressed N-terminal domain of Vph1p, but this fragment of Vph1p does not bind to V1 complexes containing subunit H. We propose that upon disassembly, the H subunit undergoes a conformational change that inhibits V1 and precludes V0 interactions.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Reference||Annotation Extension|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Conditions||Strain||Source||Reference|