Table 2.
Binding affinities of 3PG for the hPGK wild type and various mutants in the absence and presence of MgADP and their kinetic parameters*
KD/mM | α | KM/mM | kcat/s−1 | ||
−MgADP | +MgADP | ||||
WT | 0.112 (0.106 to 0.119) |
0.251 (0.239 to 0.263) |
0.448 (0.426 to 0.470) |
0.20 ± 0.06 | 795 ± 50 |
K215A | 0.108 (0.102 to 0.113) |
0.150 (0.146 to 0.155) |
0.716 (0.695 to 0.739) |
nd† | nd† |
D374K | 0.110 (0.104 to 0.115) |
0.140 (0.132 to 0.147) |
0.785 (0.745 to 0.829) |
nd† | nd† |
D374N | 0.111 (0.106 to 0.115) |
0.0656 (0.0656 to 0.0675) |
1.69 (1.64 to 1.69) |
0.16 ± 0.03 | 315 ± 15 |
*The KD values in the presence of MgADP are calculated from the α-values (see Fig. 1C). Values in brackets represent the 95% bootstrap CIs. KM and kcat values, with their SDs, are calculated from three independent experiments.
†Not detectable.