Table 1. Collection of the low-spin g-values of the nitrite complexes of NPs and related heme distortion.

Protein complex	HALS or LS1			LS2			Relative spin contribution of HALS b	Heme distortion in NP[NH3] complexes
	g 1	g 2	g 3	g 1	g 2	g 3		RMSD d (0.01 Å)	PDB code
NP4[NO2–] c	3.38	— a	— a	2.74	2.42	1.51	≈30%	14.9	1X8P
NP1[NO2–]	3.33	— a	— a	2.72	2.41	1.50	≈30%	13.9	2NP1
NP2[NO2–]	2.95	2.23	1.41	2.70	2.48	1.44	≈0%	24.9	1EUO
NP7[NO2–] c	2.86	2.34	1.46	2.78	2.40	1.46	≈0%	18.5	4XMD

^a“Large g_max” type of spectrum, g₂ and g₃ are not observable.

^bData obtained from spectra simulations.

^cFrom ref. 27.

^dCalculated based on the heme core using the program Olex2.42