Isono, "Connection between capsomeres
in human papilloma virus," Virology, vol.
Specifically, BPV presents a double-stranded circular DNA, not coiled, with approximately 8 kb, surrounded by an icosahedral capsid consisting of 360 copies of the L1 protein of 55kDa, 72 capsomeres
arranged in approximately 12 copies of the L2 protein, 39 kDa [1-8].
JCV capsids are predicted to contain 360 molecules of VP1 arranged in 72 pentameric subunit, with each VP1 pentamer associated to a single VP2 or VP3 molecule to form the individual capsomeres
 (Figure 2).
The outer protein is referred to as the capsid, which is made up of repeating protein subunits called capsomeres
. The architectural arrangement of the capsid determines the virus' general form, classified as being either polyhedral (equilateral triangles that fit together to form a dome), helical (capsomeres
spiral to form a rod-shaped structure), or complex (a combination of structures with a helical portion called a tail attached to a polyhedral portion called a head that is typically seen with bacteriophages) (Figure 7-1).