Table 1. Kinetic Parameters of Firefly Luciferase Variantsa.
| enzyme | Km (μM) | kcat (cps/nM) | kcat/Km |
|---|---|---|---|
| WT | 1.21 ± 0.04 | 9.70 × 104 | 8.00 × 104 |
| LGR | 0.76 ± 0.06 | 3.87 × 105 | 5.09 × 105 |
| mutant E | 8.81 ± 0.27 | 1.05 × 106 | 1.20 × 105 |
| YY5 | 4.20 ± 0.18 | 1.37 × 106 | 3.26 × 105 |
Apparent kcat values were obtained by dividing the calculated apparent Vmax(cps) by the luciferase concentration (7 nM).