Fig. 7. Comparison of multicomponent cell-to-cell transport systems encoded by plant viruses. Genes are shown as boxes with names of encoded proteins. Genes of proteins involved in cell-to-cell movement are shown in colour. PRO, proteinase domain; PVX, Potato virus X (X05198); CarMV, Carnation mottle virus (X02986); PVY, Potato virus Y (M95491); BYV, Beet yellows virus (X73476). Potyviral proteins implicated in virus spread in addition to CI protein (see text) are the genome-linked proteins (VPg), HCpro and CP (Callaway et al., 2001; Rajamaki & Valkonen, 1999; Revers et al., 1999; Rojas et al., 1997; Saenz et al., 2002). BYV proteins involved in cell-to-cell movement in addition to Hsp70h (see text) include CP and its distant homologue (dCP), the minor CP 64K, the papain-like leader proteinase responsible for processing replicative protein precursors and the 6K small hydrophobic protein resembling potex-like TGBp3 (Alzhanova et al., 2000; Peng et al., 2001, 2002, 2003; Napuli et al., 2003; Dolja, 2003).

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