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. Begomovirus genome is shuttled out of nucleus by Nuclear shuttle protein (NSP) and the movement protein transports the DNA-NSP complex to cell plasmodesmata and facilitates further movement across the cell wall. Binds to dimeric supercoiled plasmid DNA. Found on ER-derived vesicles. Phosphorylated. Belongs to the begomovirus movement protein BC1 family.