Figure 6.

Average charge on the N-tails of viruses in our dataset compared to the characteristic lengths of their genomes. The charge is calculated at three different values of pH, and the tails are obtained using the STRIDE assignment of protein secondary structure. Smaller plots—note the different scales—enlarge the part of the plot where the viral families which utilize positively charged tails are located. Viruses in the Bromoviridae family have a tripartite genome and pack the larger two segments, the longer RNA1 and the shorter RNA2, into separate virions. These entries are shown twice, with the shorter genome having a symbol with an edge of a lighter color. Viruses in Nodaviridae family have a bipartite genome, where both RNAs are packaged into a single virion. Genome lengths of these entries show the combined length of both RNAs.