Figure 2. Comparison of VIM Active Sites.
A. Active site of VIM-1, showing positions of His224 and Ser228 and location of Cys221-bound water Wat3. Hydrogen bonding interactions are shown as dashed lines. B. Active site superpositions of VIM-2 (pdb 4BZ3, blue) and VIM-4 (pdb 2WHG, red) showing variations at positions 224 and 228.