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- W2024963206 abstract "Replication represents a key step in the infectious cycles of RNA viruses. Here we describe a regulatory RNA element, termed replication silencer, that can down-regulate complementary RNA synthesis of a positive-strand RNA virus via an RNA-RNA interaction. This interaction occurs between the 5-nucleotide-long, internally positioned replication silencer and the extreme 3'-terminus of the viral RNA comprising part of the minimal minus-strand initiation promoter. Analysis of RNA synthesis in vitro, using model defective interfering (DI) RNA templates of tomato bushy stunt virus and a partially purified, RNA-dependent RNA polymerase preparation from tombusvirus-infected plants, revealed that this interaction inhibits minus-strand synthesis 7-fold. This functional interaction was supported further by: (i) RNA structure probing; (ii) phylogenetic analysis; (iii) inhibition of activity by short complementary DNAs; and (iv) compensatory mutational analysis. The silencer was found to be essential for accumulation of DI RNAs in protoplasts, indicating that it serves an important regulatory role(s) in vivo. Because similar silencer-promoter interactions are also predicted in other virus genera, this type of RNA-based regulatory mechanism may represent a widely utilized strategy for modulating replication." @default.
- W2024963206 created "2016-06-24" @default.
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- W2024963206 date "2003-10-15" @default.
- W2024963206 modified "2023-10-14" @default.
- W2024963206 title "A replication silencer element in a plus-strand RNA virus" @default.
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- W2024963206 doi "https://doi.org/10.1093/emboj/cdg523" @default.
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