HydrolysisCatalysisKineticsSubstrate SpecificityBinding SitesModels, MolecularBiocatalysisAdenosine TriphosphateCatalytic DomainMolecular Sequence DataAmino Acid SequenceHydrogen-Ion ConcentrationEscherichia coliCrystallography, X-RayMutagenesis, Site-DirectedProtein ConformationModels, ChemicalProtein BindingAdenosine TriphosphatasesRecombinant ProteinsMolecular StructureProtein Structure, TertiaryGuanosine TriphosphateStructure-Activity RelationshipStereoisomerismPhosphatidylinositolsMagnesiumEstersProton-Translocating ATPasesMutationAdenosine DiphosphateBase Sequence