MetallochaperonesMetalloidsArsenicIon PumpsX-Ray Absorption SpectroscopyAntimonyBicyclo CompoundsMolecular ChaperonesEscherichia coliEscherichia coli ProteinsTrans-ActivatorsTwo-Hybrid System TechniquesBacterial ProteinsBinding SitesCysteineCrystallography, X-RayModels, MolecularProtein ConformationMolecular Sequence Data