Figure 2
Electron-density distribution around the ligand-binding sites of apo SeEN (PDB entry 4rop) (a) and PEP-bound SeEN (PDB entry 5j04) chains A and B (b, c). For simplicity, only those residues that directly interact (dotted lines) with the Ca2+ ions and PEP are displayed. Wireframe surfaces indicate 2Fo − Fc electron-density maps contoured at 1.5σ. Grey spheres indicate the Ca1 and Ca2 metal-binding sites. Red spheres indicate water molecules. |