Figure 4 - full size


Figure 4.
Fig. 4. The active site of the native CA XII structure showing the five-coordinate zinc ion. The zinc ion is colored cyan. Oxygen, nitrogen, and carbon atoms are red, blue, and gray, respectively. Hydrogen bonds are shown as dashed lines with distances labeled (Å). Average zinc-ligand distances are as follows: Zn2+-His-94, 2.0 Å; Zn2+-His-96, 2.1 Å; Zn2+-His-119, 2.1 Å; Zn2+-OH[2], 2.1 Å; Zn2+-acetate, 2.3 Å.