FIGURE 7.

A, active site of apo-BaP4H structure with no cofactors bound. B, hydrogen bonding interactions of active site residues of apo-BaP4H between protein and water are indicated by black dashes with corresponding distances. The metal binding residues (His¹²⁷, Asp¹²⁹, and His¹⁹³) and residues involved in hydrogen bonds are shown as sticks: carbon (protein backbone color), oxygen (red), nitrogen (blue). The 2F_o − F_c composite omit maps (blue mesh) are contoured at 1.0 σ around the active site residues.