FIG. 6.

Correlations between log(k_cat/K_m) and ΔE₀ for laccase catalysis. Symbols: ○, oxidation of 24 phenols by 10 fungal on plant laccases (36); □, oxidation of 3 phenoxazines and 22 phenothiazines by TvL, as well as oxidation of PP by 5 fungal laccases (data from Fig. 5); ▵, oxidation of three N-OH compounds by 7 fungal laccases (data from Table 1 and Fig. 4C); +, oxidation of ABTS, K₄Fe(CN)₆ and morpholinoaniline by up to 10 fungal or plant laccases (20, 36). Other conditions: pH, 5.3 to 5.5; temperature, 20 to 25°C. Correlation: log(k_cat/K_m) = 6.4(ΔE₀) + 6.4 (r², 0.65). Units: k_cat/K_m, M⁻¹ min⁻¹; ΔE₀, V.