Figure 1 Computer graphics representation of: (left) the surface of the capsid of Murine polyomavirus (MPyV) (strain A2) (the icosahedral structure includes 360 VP1 subunits arranged in 12 pentavalent and 60 hexavalent capsomers); (right) capsomer bonding relations (there are six VP1 molecules in each icosahedral asymmetric unit, which include one subunit of a pentavalent pentamer. The six symmetrically different subunits are designated a, a
, a
, b, b and c, corresponding to three different bonding states). (From Eckhart, 1991 adapted from Salunke et al., 1986; with permission.)
Figure 2 Diagram of (left) Simian virus 40 (SV-40) and (right) Murine polyomavirus (MPyV) (strain A2) genomes and encoded proteins. Outer circles represent the viral dsDNAs (sizes in bp, origin of replication: ori), the arrows indicate the encoded viral proteins, or ORFs, as well as the direction of trancription. Introns are denoted by a single line.
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