Figure 4 - full size

 

Figure 4.
Fig. 4. Electrostatic surface potentials, calculated using the Adaptive Poisson–Boltzmann Solver^21 of (a) 4ANK (PDB code 1N0R) and (b) NI[3]C. Both representations show the concave binding site with the N- and C-termini on the right and left sides, respectively. Bound sulfate ions in the NI[3]C molecule are shown as spheres. Both surfaces were in blue and red for positive and negative electrostatic charge densities (same scale), respectively.

The above figure is reprinted by permission from Elsevier: J Mol Biol (2008, 376, 232-240) copyright 2008.