Viral Movement Proteins Induce Tubule Formation in Plant and Insect Cells
Jan W.M. van Lent and Corinne Schmitt-Keichinger
Plant viruses move from cell to cell through plasmodesmata, which are complex gatable pores
in the cell wall. As plasmodesmata normally allow the diffusion of only small molecules, virus
movement is only achieved by the action of virus-encoded movement proteins that biochemically or structurally modify these pores to enable the passage of ‘naked’ viral genomes or virus particles. For a large number of different plant viruses, the movement protein forms a transport tubule inside the plasmodesmal pore to transport mature virus particles. In this review we describe the important factors that seem to play a role in this type of transport and provide a speculative model for this movement mechanism.