Table 3. P5CDH Kinetic and NAD+ Binding Parameters.
BjPutA | kcat (s–1)a | Km (mM)a | kcat/Km (M–1 s–1) | Kd (μM, NAD+)b |
---|---|---|---|---|
wild-type | 3.4 ± 0.1 | 0.42 ± 0.04 | 8095 ± 822 | 0.60 ± 0.04 |
T348Y | 4.2 ± 0.2 | 0.42 ± 0.04 | 10000 ± 1017 | 0.75 ± 0.06 |
S607Y | 4.5 ± 0.2 | 0.48 ± 0.03 | 9375 ± 664 | 1.00 ± 0.04 |
D778Y | 3.8 ± 0.1 | 0.38 ± 0.02 | 10000 ± 567 | 0.67 ± 0.04 |
D779A | 5.0 ± 0.1 | 0.38 ± 0.03 | 13157 ± 1102 | 0.64 ± 0.05 |
D779Y | 0.02 ± 0.01 | 0.20 ± 0.03 | 100 ± 16 | 0.65 ± 0.04 |
D779W | 0.003 ± 0.001 | 0.35 ± 0.15 | 8.6 ± 4 | 0.78 ± 0.05 |
Mixture of 0.01–6 mM L-P5C, 0.2 mM NAD+, 0.25 μM enzyme, and 50 mM potassium phosphate (pH 7.5, 600 mM NaCl).
From fluorescence quenching with 0.1–25 μM NAD+, 0.25 μM enzyme, and 50 mM potassium phosphate (pH 7.5).