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Isolated membranes of the extreme haloalkaliphilic archaeon Natronococcus occultus were able to hydrolyze ATP via an ATPase, which required the presence of Mg 2+ , high concentrations of NaCl, and a pH value of 9. The native molecular mass of the purified ATPase was 130 kDa and was composed of 74- and 61-kDa subunits. Enzyme activity was specific for the hydrolysis of ATP with slight activity...