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Effect of Mg2+ on TrwD ATPase turnover. A and B, ATPase activity of TrwD (1 μm as monomer) was measured at increasing concentrations of ATP in the presence of 2 mm Mg2+ (A) or 10 μm Mg2+ (B). Data were fitted to the Hill equation (Equation 1 in the supplemental material). Error bars in both panels indicate S.D.
