Transports viral genome to neighboring plant cells directly through plasmosdesmata, without any budding. The movement protein allows efficient cell to cell propagation, by bypassing the host cell wall barrier. Two movement proteins, p6, Hsp70h and three structural proteins, CP, CPm, and P64 are essential for cell-cell movement. Also plays a role in virion formation. Together with CPm and p64, encapsidates the 5'-terminal portion of the viral genome (By similarity). Belongs to the heat shock protein 70 family.