Table 4.

Kinetic and thermodynamic parameters for reaction of cytochrome bd with gaseous ligands at room temperature.

	E. coli (cytochrome bd-I)						A. vinelandii
	O2		CO		NO		O2	CO
	R1-O2	R3-O2	R1-CO	R3-CO	R1-NO	R3-NO	R3-O2	R1-CO	R3-CO
kon (M−1 s−1)		2 × 109 b,e		8 × 107 b,f			2 × 109 h 2.8 × 108 i	1 × 108 g	1.5 × 108 g
koff (s−1)	78a		4.2a	6a	0.036a	0.133a
Kd (nM)	280c			80d

^a[107];

^b[222];

^c[240];

^d[255];

^e[47];

^f[43];

^g[249];

^h[241];

ⁱ[278].