Table 1.

Heme coordination geometry in P450-isonitrile complexes.

Complex	Cys-S—Fe distance (Å)	Fe—C (ligand) distance (Å)	Fe—C—N (ligand) angle (°)
P450nor(Fe2+)a	2.36	1.85	175
P450nor(Fe3+)b	2.33	1.86	171
P450cam(Fe2+)c	2.30	1.86	159
P450cam(Fe3+)d	2.24	1.82	149
17A1 chain A	2.70	2.64	152.33
17A1 chain B	2.34	2.78	149.93
17A1 chain C	2.69	2.13	171.06
17A1 chain D	2.69	2.13	163.58

PDB codes

^a1GEI.

b1GEJ.

^c1GEK.

^d1GEM.