Figure 2.
X-ray structure of BoDV-1 POD. (a) Structure of BoDV-1 monomeric POD as obtained in the asymmetric unit. (b) Structure of the tetrameric POD after applying the inherent symmetry operations of the tetragonal space group. The four parallel monomers are coloured in purple, yellow, blue, and green, respectively. (c) Electrostatic surface potential of POD. The potential scale ranges from −5 kT/e (red) to 5 kT/e (blue); the orientation is as in (b). (d) Detail of the β-strand twist motif that separates the two α-helical coiled-coils. (e) Orthogonal view of the β-strand twist motif as shown in (d), showing the 45° rotation of the helical axis around the super helical axis.