Figure 3
Structure of PhBCCPΔN79 crystals around residue 138. Protein molecules are depicted as stick models with atom-type colouring in (a) the wild type, (b) the A138I mutant and (c) the A138Y mutant. The 2Fo − Fc electron-density maps from refined models contoured at 1.0σ are overlaid. Red and white asterisks denote water molecules and a sodium ion (in the wild type), respectively. C atoms in the asymmetric unit molecule and those in the symmetry-related molecule are distinguished by yellow and grey colouring, respectively. This figure was prepared using Coot. |