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Kinetic properties of the purified peroxidase isoenzymes from tomato roots using syringaldazine as a substrate
| Isoenzyme | Vmax | Km | [Et] | kcat | kcat/Km |
|---|---|---|---|---|---|
| pI | μm s−1 | μm | s−1 | μm−1 s−1 | |
| 9.6 | 6.83 | 11.4 | 0.41 | 17.0 | 1.50 |
| 8.2 | 2.52 | 14.7 | 0.21 | 12.0 | 0.82 |
| 7.5 | 0.41 | 8.0 | 0.25 | 1.6 | 0.20 |
| 6.5 | 1.40 | 46.3 | 0.11 | 12.7 | 0.27 |
| 3.6 | 12.30 | 26.0 | 0.32 | 38.4 | 1.47 |
Vmax, ΔA530·s−1/ɛ (for syrindaldazine); ɛ, molar extinction coefficient; [Et], enzyme concentration; A430/ɛ (for peroxidase); kcat, Vmax/[Et]; kcat/Km, catalytic efficiency.
