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Glucose dehydrogenase from Bacillus megaterium exists as a stable, active tetramer at pH 6.5. By shifting the pH to 9. the enzyme is. completely and reversibly, dissociated into four inactive protomers. Kinetics and mechanism of this pH-induced dissociation have been studied, at various enzyme concentrations, by ultraviolet absorption, circular dichroism, normal and stopped-flow fluorescence as well as by light scattering and activity measurements. Dissociation of the fully active tetramerdoi:10.1515/znc-1987-7-830 fatcat:exxdsyngfrapdarv2pqfndo52m