Figure 2:
The histidine brace in N. crassa Q7SA19 (PDB ID: 4EIS). Six amino-acids surrounding the metal-binding site are shown in stick representation. Copper is shown as a sphere. Octahedral copper coordination is indicated by dashed lines. The solvent exposed axial ligand is modeled as a hydrogen peroxide (stick) and the fourth equatorial ligand is water (sphere).