Table 2. Kinetic parameters for the nitrite reductase activity of the Cr-TrHb1s.

	Cr-TrHb1-1	Cr-TrHb1-2	Cr-TrHb1-4
Parameters of the nitrite reductase activity pH 6.6 and 20°C
Fast Process
k -L (s-1)	7.2±1.1	9.3±1.9	2.6(±0.4)×101
ρ	1.0(±0.3)×102	1.4(±0.4)×102	5.7±0.9
Slow Process
h on (M-1 s-1)	9.8(±3.4)×101	5.4(±1.7)×101	6.9±2.4
Parameters fitting the pH-dependence of nitrite reductase activity at 20°C a
f h 0 (s-1)	1.8±0.3	7.0(±1.2)×101	6.6±1.0
f h 1 (s-1)	1.0(±0.2)×101	7.8(±1.3)	3.1(±0.7)×101
s h 0 (s-1)	5.1(±0.8)×10−3	8.6(±2.1)×10−1	1.4(±0.3)×10−2
s h 1 (s-1)	2.2±0.4	-	1.2±0.3
pK af	6.8±0.2	8.0±0.2	7.2±0.2
pK as	5.8±0.2	-	5.4±0.2

^a Values obtained at [NO₂ ^-] = 5.0×10^–2 M after mixing.