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Tomato bushy stunt virus (TBSV) is a plus-sense RNA virus which encodes a 33-kDa protein in its 5′-most open reading frame (ORF). Readthrough of the amber stop codon of the p33 ORF results in the production of a 92-kDa fusion protein. Both of these products are expressed directly from the viral genome and are suspected to be involved in viral RNA replication. We have investigated further the roles of these proteins in the amplification of viral RNAs by using a complementation system in which p33 and p92 are expressed from different viral RNAs. Our results indicate that (i) both of these proteins are necessary for viral RNA amplification; (ii) translation of these proteins can be uncoupled while maintaining amplification of viral RNAs; (iii) if compatibility requirements exist between p33 and p92, they are not exceptionally strict; and (iv) the C-terminal ∼6% of p33 is necessary for its functional activity. Interestingly, no complementation was observed when a p33-encoding replicon containing a deletion of a 3′-located segment, region 3.5, was tested. However, when 5′-capped transcripts of the same replicon were analyzed, complementation allowing for RNA amplification was observed. This ability to compensate functionally for the absence of region 3.5 by the addition of a 5′ cap suggests that this RNA segment may act as a translational enhancer for the expression of virally encoded products.

Uncoupled Expression of p33 and p92 Permits Amplification of Tomato Bushy Stunt Virus RNAs