Figure 3
UDP-binding site and the omit difference electron-density map. The map has coefficients |Fo − Fc|, αc and is contoured at 3.5σ. Fo represents the observed structure factors, Fc the calculated structure factors and αc the calculated phases from which ligand contributions were omitted. Protein residues within 4 Å of UDP are labelled and putative hydrogen bonds (within 3.6 Å) are shown as black dashed lines. Atoms are coloured as described in Fig. 2, with the Cα atoms of the protein coloured salmon. |