Participates in the transport of viral genome to neighboring plant cells directly through plasmodesmata, without any budding (PubMed:18353960). Multifunctional movement protein with RNA-binding, ATPase and helicase activities (PubMed:8995680, PubMed:12069530). Engages in homologous interactions leading to the formation of a ribonucleoprotein complex containing plus-sense viral RNAs (vRNPs) (PubMed:18353960). ATPase activity is probably required for vRNPs movement complex assembly (PubMed:32730331). Intracellular delivery of TGBp1-containing vRNPs to plasmodesmata is facilitated by TGBp2 and TGBp3 (By similarity). ATP + H2O = ADP + H(+) + phosphate ATPase activity is enhanced by the suppressor of RNA silencing Gamma-B. Homooligomer (PubMed:19570874). Interacts with movement protein TGB3 (PubMed:18353960). TGB1-TGB3-TGB2 complex formation is enhanced by ATP hydrolysis (PubMed:32730331). Interacts with the suppressor of RNA silencing Gamma-B (via N-terminus) (PubMed:32730331). TGB1 nuclear-cytoplasmic trafficking is required for cell-to-cell movement and systemic infection (PubMed:28872759). Associates with host microtubules (By similarity). The genome of this virus consists of three linear, positive, single-stranded RNAs encapsidated in separate virions designated RNA-alpha, RNA-beta and RNA-gamma. Three proteins (alpha-A, beta-A and gamma-A) are translated directly from these genomic RNAs and the remaining proteins encoded on RNA-beta (beta-B, beta-C and beta-D) and RNA-gamma (gamma-B) are expressed via three subgenomic messenger RNAs. Belongs to the virgaviridae/benyvirus TGB1 movement protein family.