Figure 2.
The dependence of the observed second-order rate constant (kcat/Km)obs for the proton transfer reactions of the free carbonyl form of [1-13C]-GA (20 mM total substrate) catalyzed by wildtype and L232A mutant Tbb TIM on the concentration of phosphite dianion in D2O at pD 7.0 (10 - 20 mM imidazole), 25 °C and I = 0.1 (NaCl). Key: (■) Data for wildtype Tbb TIM (Ref. 17); (●) Data for L232A mutant Tbb TIM.