Figure 4From: Conservation of structure and activity in Plasmodium purine nucleoside phosphorylasesStructure of Pf PNP-HRA complex. (a) active site of typical subunit (b) active site of subunit F (c) corresponding electron density (2Fobs-Fcalc, contoured at 1 sigma) for the 'in' and 'out' modes of Arg 27 respectively. Hydrogen bonds are shown as blue dashed lines with distances in Ã…ngstroms, and bound water molecules are shown as red spheres.Back to article page