Strong activator of the late viral genes promoters. Enhances the expression of the capsid protein and nuclear shuttle protein. Acts as a suppressor of RNA-mediated gene silencing, also known as post-transcriptional gene silencing (PTGS), a mechanism of plant viral defense that limits the accumulation of viral RNAs. Suppresses the host RNA silencing by inhibiting adenosine kinase (ADK), a kinase involved in a general methylation pathway. Also suppresses the host basal defense by interacting with and inhibiting SNF1 kinase, a key regulator of cell metabolism implicated in innate antiviral defense. Determines pathogenicity. Monomer. Homodimer. Homooligomer. Self-interaction correlates with nuclear localization and efficient activation of transcription. Monomers suppress local silencing by interacting with and inactivating host adenosine kinase (ADK) in the cytoplasm. Interacts with and inhibits host SNF1 kinase. Binds to ssDNA. The phosphorylated form appears to accumulate almost exclusively in the nucleus, whereas the non-phosphorylated form is found in both nucleus and cytoplasm. The zinc finger and the transactivation region are involved in PTGS suppression. Phosphorylated. Belongs to the geminiviridae transcriptional activator protein family.