Fig. 3.
Secondary structure of parvovirus B19. (a) Ribbon diagram of VP2. The strands of the β-barrel (gray) are labeled sequentially A through I. The surface loops connecting the strands of the β-barrel are labeled by color: dark blue, BC loop; dark green, DE loop; light blue, EF loop; red, GH loop; light green, HI loop; yellow, C-terminal amino acids. The position of the disordered loop (amino acids 301–313) (dashed line) was modeled based on the corresponding AAV-2 loop. There is a RMSD of 0.3 Å between the 13 Cα atoms of AAV-2 and the modeled B19 structure, although the loop as a whole has been translated and rotated. (b) Surface topography of B19. The surface loops are color-coded according to the ribbon diagram. The disordered loop has been omitted.