Electrostatic surface potential maps of ArsR-DBD. Red
indicates a negatively charged region, blue indicates a positively
charged region, and white indicates a neutral or hydrophobic region.
A, the molecule is oriented to display the predicted DNA binding
surface. Residues contributing to the positive surface potential are Arg-173,
Lys-190, Arg-198, Arg-200, Lys-202, Lys-205, and Arg-217. B, the
molecule was rotated to reveal a negatively charged surface, attributable to
residues Asp-130, Glu-158, Glu-174, Glu-179, Glu-181, and Glu-186.