Fig. 5.

“Spooling raft” model of the SPV1 genome packing. (A) The dsDNA nucleoprotein genome of SPV1 is circular, but the packing involves a long double filament with connecting loops at each end. (B) Rafts of SPV1 filaments with dotted lines indicating the connecting loops. (C) Spooling raft model of SPV1 genome packing. (Left) A central slice is shown from a top view, where one can see both the concentric shells and the crossings between shells. (Right) A side view giving rise to the sharp striations seen in projection (Fig. 3A).