Fig. 4.
Ribbon diagrams derived from the X-ray crystal structures of (A) BamL and (B) BpumL, with the bound SAH ligand shown in yellow ball-and-stick representation. (C) Electron density maps calculated using Fourier coefficients (Fobs – Fcalc) with phases derived from the refined 1.75 Å resolution structure of BamL calculated with the coordinates for SAH omitted before one round of crystallographic refinement. The map is contoured at 2.6σ (blue mesh) and 8σ (red mesh) and the final refined coordinates are superimposed. The coordinates for SAH and polar active site residues that are important in catalysis are shown as yellow (ball-and-stick).