Figure 4

Ramachandran plot for (a) EndoIII; (b) EndoIII/ds-DNA. For (a,b), the vertical and horizontal axes refer to the backbone dihedral angle (φ) and the amino acid bond angle (ϕ), respectively. The inset images show ribbon representations of PDB structures, 2ABK10 and 1P5928, and the colors indicate: ds-DNA (orange); α-Helix (purple and blue); undefined secondary structure (white and cyan); [4Fe4S]2+ (brown and yellow balls); Surface representation of (c) EndoIII (2ABK) and (d) EndoIII/ds-DNA (1P59); the color code indicates the Β−factors obtained for the PDB structures.