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- W4381612561 abstract "Many viruses block host gene expression to take over the infected cell. This process, termed host shutoff, is thought to promote viral replication by preventing antiviral responses and redirecting cellular resources to viral processes. Several viruses from divergent families accomplish host shutoff through RNA degradation by endoribonucleases. However, viruses also need to ensure expression of their own genes. The influenza A virus endoribonuclease PA-X solves this problem by sparing viral mRNAs and some host RNAs necessary for viral replication. To understand how PA-X distinguishes between RNAs, we characterized PA-X cut sites transcriptome-wide using 5′ rapid amplification of complementary DNA ends coupled to high-throughput sequencing. This analysis, along with RNA structure predictions and validation experiments using reporters, shows that PA-Xs from multiple influenza strains preferentially cleave RNAs at GCUG tetramers in hairpin loops. Importantly, GCUG tetramers are enriched in the human but not the influenza transcriptome. Moreover, optimal PA-X cut sites inserted in the influenza A virus genome are quickly selected against during viral replication in cells. This finding suggests that PA-X evolved these cleavage characteristics to preferentially target host over viral mRNAs in a manner reminiscent of cellular self versus non-self discrimination. Endoribonuclease PA-X allows influenza A virus to discriminate between viral and host transcripts by cleaving GCUG tetramers." @default.
- W4381612561 created "2023-06-23" @default.
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- W4381612561 date "2023-06-22" @default.
- W4381612561 modified "2023-10-18" @default.
- W4381612561 title "Cut site preference allows influenza A virus PA-X to discriminate between host and viral mRNAs" @default.
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- W4381612561 doi "https://doi.org/10.1038/s41564-023-01409-8" @default.
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