Figure 2

left side: molecular electrostatic potential of the viral double histone fold, in the region of putative contact between the protein and DNA. Blue surfaces correspond to repulsive regions (i.e. positively charged), while red surfaces to attractive regions (i.e. negatively charged). Right side: molecular electrostatic potential of the nucleosomal histone dimer H3-H4, in the region of contact between the dimer and DNA.