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Figure 1.
Fig. 1. Stereo views of the type 2 Cu sites with (A) bound
nitrite and (B) nitric oxide. In each panel, the electron
density represented in gray is a 2F[o] - F[c] map contoured at
0.55 e^-/Å3 (1.2  for each
structure). Omit difference maps of the nitrite and nitric oxide
ligands are colored in green and contoured at 0.6 e^-/Å3
(5.1 for NO[2]^- and
4.6 for NO). Carbons
(orange), oxygens (red), nitrogens (blue), type 2 Cu (brown),
and waters (cyan) are colored as indicated. (C) Overview of the
essential features of the active sites of NiR bound with nitrite
(left) and with nitric oxide (right). Metal-ligand bonds
(solid), as well as H bonds and other electrostatic interactions
(dashed), are shown as gray lines of the type indicated.
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