FIG 5 .

The aspartate binding pocket of GlnH. Two views are presented of the ligand-binding pocket, focused on polar contacts between GlnH and the amino and carboxyl groups of the Asp ligand (A) and the R group of the Asp ligand (B). Side chains that make polar contacts with the Asp ligand are shown in stick mode, with hydrogen bonds and salt bridges shown as broken lines. Asp ligand is shown in white, and GlnH is in green. (C) An equivalent view of the aspartate binding pocket with the electron density map displayed on the Asp ligand, water, and selected protein residues (2F_o − F_c map contoured at 1.6 σ).