. Author manuscript; available in PMC: 2015 Jan 21.

Published in final edited form as: Chem Soc Rev. 2014 Jan 21;43(2):676–706. doi: 10.1039/c3cs60249d

Table 6.

EPR parameters of nitrate reductases

Enzyme	Signal	Spin (%)	g₁	g₂	g₃	g_av	A/MHz	Anisotropy, g₁ –g₃	Rhombieity, (g₁ – g₂)/(g₁ – g₃)	Ref.
Dd-NapA	Resting	<5								120, 246
	Low-potential	5–15	2.016	1.987	1.964	1.989		0.052	0.56
	High potential	NR	2.019	1.988	1.960	1.989		0.059	0.53
	High-g nitrate	≤40	2.000	1.990	1.981	1.990	12.9, 14.0, 12.9	0.019	0.56
	Turnover	50	1.999	1.990	1.982	1.990	14.0, 16.8, 14.0, 7.8 (H)	0.017	0.53
			1.999	1.992	1.982	1.991	16.3, 18.2, 15.4	0.017	0.41
	Cyanide	3	2.024	2.001	1.995	2.007	22.4, 21.0, 16.8	0.029	0.79
Pp-NapAB	High g-split/high g-resting	2.5–10	1.999	1.991	1.981	1.990	17.9, 14.6, 14.0, 7.8 (H)	0.018	0.46	212, 214
	High-g (NO₃⁻)	NR	1.999	1.982	1.990	1.990	17.94, 12.05, 12.89, 14.29	0.017	0.59
	Low-g split	10–20	1.996	1.969	1.961	1.975	36.4, 38.1, 42.8	0.035	0.77
	Low g-unsplit	NR	1.997	1.962	1.959	1.973		0.037	0.93
	Very high-g	40	2.022	1.999	1.994	2.005	20.74, 20.74, 18.5, 19.90 (H)	0.029	0.80
	High-g (N₃⁻)	NR	2.007	1.994	1.988	1.996	19.06, 17.94, 15.97, 17.66 (H)	0.023	0.74
	High-g (SCN⁻)	10	2.008	1.991	1.985	1.994	18.78, 18.50, 15.41, 17.66 (H)	0.023	0.74	206
Ec NapAB	High-g split	70–90	1.997	1.988	1.981	1.989	16.8, 13.4, 13.4	0.016	0.55	96
Rs NapAB	Very High-g		2.023	2.000	1.994	2.006	21.8, 19.9, 16.8	0.029	0.79	186, 205, 248
	High-g split	10–20	1.999	1.991	1.981	1.990	17.1, 15.7, 14.0, 8.1,	0.018	0.45	186, 213, 247
Rs NapA	High-g split	60	1.998	1.991	1.981	1.990	17.6, 15.1, 14.0	0.018	0.44
Sg NapAB	High-g		1.999	1.990	1.981	1.990	17.9, 14.6, 15.4	0.018	0.50	254