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Top row, mesophilic EcFtsZ. Bottom row, thermophilic MjFtsZ. The kinetic rates of GTP hydrolysis, kcat (A and C), and filament depolymerization, kdepol (B and D), are plotted as a function of temperature. The apparent enthalpies (ΔH0‡) and entropies (ΔS0‡) of the transition state were calculated by nonlinear regression using Eq 4 (solid lines), and the best-fit values are reported in Table 3.
