Figure 2 - full size

 

Figure 2.
Fig. 2. Close-up views of coordination geometries of the metal cofactors in the HO active-site region. Refined model coordinates for the active site region are superimposed on 2F[o] – F[c] maps contoured at 1.0 , except for heme·HO, with elements of the protein and cofactors in ball-and-stick models for top (Left) and side (Right) views. Green is carbon, and purple, red, and pink are nitrogen, oxygen, and iron, respectively. (A) Heme·HO. (B) 1·HO refined to 1.35 Å. (C) 2·HO refined to 1.85 Å. (D) 3·HO refined to 1.75 Å.