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The bipartite genomic RNAs of red clover necrotic mosaic virus (RCNMV) lack a 5′ cap and a 3′ poly(A) tail. RNA1 encodes viral replication proteins, and RNA2 encodes a movement protein (MP). These proteins are translated in a cap-independent manner. We previously identified two cis-acting RNA elements that cooperatively recruit eukaryotic translation initiation factor (eIF) complex eIF4F or eIFiso4F...
Programmed −1 ribosomal frameshifting (−1 PRF) is one viral translation strategy to express overlapping genes in positive-strand RNA viruses. Red clover necrotic mosaic virus (RCNMV) uses this strategy to express its replicase component protein p88. In this study, we used a cell-free translation system to map cis-acting RNA elements required for −1 PRF. Our results show that a small stem-loop structure...
The specific recognition of genomic RNAs by viral replicase proteins is a key regulatory step during the early replication process in positive-strand RNA viruses. In this study, we characterized the RNA-binding activity of the auxiliary replicase protein p27 of Red clover necrotic mosaic virus (RCNMV), which has a bipartite genome consisting of RNA1 and RNA2. Aptamer pull-down assays identified the...
Red clover necrotic mosaic virus Canadian strain (RCNMV-Can) induces symptoms on host plants at 17°C, but not at 25°C. We investigated the temperature sensitivity of RCNMV-Can in Nicotiana benthamiana plants and protoplasts using infectious transcripts of genomic RNAs 1 and 2. Viral RNAs accumulated in both inoculated and noninoculated leaves at 17°C, whereas no viral RNAs were detected at 25°C in...
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