Participates in the transport of viral genome to neighboring plant cells directly through plasmodesmata, without any budding (PubMed:20923354, PubMed:12093178, PubMed:12655103, PubMed:21660184). Multifunctional movement protein with RNA-binding, ATPase and helicase activities (By similarity). Engages in homologous interactions leading to the formation of a ribonucleoprotein complex containing plus-sense viral RNAs (vRNPs) (By similarity). ATPase activity is probably required for vRNPs movement complex assembly (By similarity). Intracellular delivery of TGBp1-containing vRNPs to plasmodesmata is facilitated by TGBp2 and TGBp3 (PubMed:12093178). ATP + H2O = ADP + H(+) + phosphate Homooligomer (Probable) (PubMed:25576325). TGB1-TGB3-TGB2 complex formation is enhanced by ATP hydrolysis (By similarity). Interacts with the suppressor of RNA silencing (via N-terminus) (By similarity). Interacts (via N-terminus) with host importin IMPA1 (PubMed:25576325). TGB1 nuclear-cytoplasmic trafficking is required for cell-to-cell movement and systemic infection (By similarity). Associates with host microtubules (PubMed:20923354). The N-terminal 84 amino acids contain a nucleolar localization signal. Belongs to the virgaviridae/benyvirus TGB1 movement protein family.