This scheme is attractive because the RdRp would not need to gain new structural Figure 9 Role of C-terminus of TBSV RdRp in viral RNA synthesis. (A) Summary schematic diagram depicting the role of the C-terminal residues of p92 in sg mRNA transcription and viral genome replication as determined by progressive terminal deletion analysis. (B) A PT model for TBSV sg mRNA transcription highlighting the role of the C-terminus of p92 in the different steps of the process.