Table 3.

Steady-state kinetic parameters for the peroxidase activity of wild-type and variant forms of horse heart myoglobin [sodium phosphate buffer (0.1 M), pH 6, 25°C]

Protein	k1		k3
	(M−1 s−1)	k1(variant)/k1(wild-type)	(M−1 s−1)	k3(variant)/k3(wild-type)
Wild-type Mb	5.4(2)  × 102	1	8.8(1)  × 103	1
F46L	1.32(3)  × 103	2.4	4.0(4)  × 103	0.5×
F46L/I107F	2.67(2)  × 103	4.9	4.1(3)  × 103	0.5×
T39I/F46L/I107F	1.02(2)  × 104	18.9	1.9(9)  × 104	2.2×
T39I/K45D/F46L/I107F	1.34(5)  × 104	24.7	1.4(3)  × 104	1.6×