Eyring plots of the GTPase activity and polymerization of FtsZ.

Top row, mesophilic EcFtsZ. Bottom row, thermophilic MjFtsZ. The kinetic rates of GTP hydrolysis, k_cat (A and C), and filament depolymerization, k_depol (B and D), are plotted as a function of temperature. The apparent enthalpies (ΔH^0‡) and entropies (ΔS^0‡) of the transition state were calculated by nonlinear regression using Eq 4 (solid lines), and the best-fit values are reported in Table 3.