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The clamp in the clamp-clamp loader complex is closed in the presence of 3 m KOAc at all ATP concentrations. The steady-state ATPase rates were measured in the presence of an ATP regeneration system (“Experimental Procedures”). Component concentrations were 1 μm gp44/62, 1.5 μm uncross-linked dm-gp45 (closed symbols), or BMH-dm-gp45 (open symbols), and the indicated amount of ATP. The KOAc concentration in the reaction buffer was 3 m.
