1.3.99.32 | more |
the decarboxylating, EC 1.3.99.7, and nondecarboxylating capabilities are provided by complex structural changes around the glutaconyl carboxylate group, the key factor being a Tyr to Val exchange strictly conserved between the two GDH types, the interaction between the glutaconyl carboxylate and the guanidinium group of a conserved Arg is stronger in GDHDes than in the decarboxylating enzyme, molecular dynamics. The identified structural changes prevent decarboxylation 1. by strengthening the C4-C5 bond of glutaconyl-CoA, 2. by reducing the leaving group potential of CO2, and 3. by increasing the distance between the C4 atom, negatively charged in the dienolate transition state, and the adjacent glutamic acid |
Desulfococcus multivorans |
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