Abstract
Adenovirus type 5 encodes two short, highly structured noncoding RNAs, the virus-associated (VA) RNAI and VA RNAII. These RNAs are expressed in large amounts late during a lytic infection. Early studies established an important role for VA RNAI in maintaining efficient translation in late virus-infected cells by blocking activation of the key interferon-induced PKR protein kinase. More recent studies have demonstrated that the VA RNAs also target the RNAi/miRNA pathway. Collectively, available data suggest that the VA RNAs are multifunctional RNAs suppressing the activity of three dsRNA-sensing enzyme systems in human cells. Here, the known functions of the VA RNAs are summarized and the interplay between VA RNA expression and the activity of the interferon and RNAi pathways are discussed in more detail.
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