Fig. 3. Distortion of the DNA duplex on binding to PcrA. Space filling representations of a view along the minor groove of (A) the junction of the DNA substrate and (B) regular B-form DNA for comparison. The bases that protrude into the minor groove in the substrate are coloured magenta, the phosphate groups are coloured orange and other atoms are in cyan. This figure was created using RIBBONS (Carson, 1991).