Figure 7
Two potassium ions which cluster the three AH molecules. One of the two potassium ions is surrounded by three Asn carbonyl O atoms and three O2 atoms of Man1 to form an octahedron. Another potassium ion is bound to three O4 atoms of Man1, on the opposite side to which several water molecules are disordered. These ligands are related by the crystallographic threefold symmetry. Full black lines show coordination bonds around the two potassium cations (with their distances in Å) and dashed green lines indicate possible hydrogen bonds between the three Man1s: O3...HO2 and O3H...O6 in each.  [article HTML]