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Dependence of the observed second-order rate constant (kcat/Km)obs (M−1 s−1) for the turnover of the free carbonyl form of [1-13C]-GA by Tbb TIM and of unlabeled GA by rabbit muscle TIM in D2O on the concentration of added phosphite dianion at pD 7 and 25 °C (I = 0.10). Key: (●) Reaction of 20 mM [1-13C]-GA catalyzed by Tbb TIM; (▲) Reaction of 20 mM unlabeled GA catalyzed by rabbit muscle TIM (5); (▼) Reaction of 10 mM unlabeled GA catalyzed by rabbit muscle TIM (5).
