Calculation of Average Diameter:
The average diameter of a capsid was estimated as follows:
Minimum and maximum radii of the capsid were estimated
The number of atoms that fall within 1 Angstrom radial shells between the
minimum and maximum radii were counted.
The average diameter was calculated to be twice the largest possible radius
at which the
number of atoms in the corresponding shell is at least 25% of the maximum number of
atoms found in any shell (
Shepherd and Reddy, 2005).
Chimera Surface Renderings:
These renderings were created by overlaying a 3D grid of varying sizes on the atomic
model. The low resolution surface utilized a grid spaced at 8 Angstroms, medium
resolution used 5 Angstroms, and high resolution used 3 Angstroms. Atoms were
counted in each bin of the grid, and a contour surface calculated based on these