ArticlePLoS pathogens2026
IRES-like element-mediated translation of vsp1S4(-) suppresses BmCPV replication via RNAi antagonism.
Article in PLoS pathogens, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Double-stranded RNA (dsRNA) viruses are thought to express proteins exclusively from their sense strand, while the antisense strand serves primarily as a replication template. Whether the antisense strand harbors hidden coding potential remains largely unexplored. Here, by integrating ribosome profiling and mass spectrometry, we identify a conserved 78-amino acid microprotein, vsp1S4(-), encoded by an antisense small open reading frame (sORFs) of the Bombyx mori cypovirus (BmCPV) genome. We demonstrate that vsp1S4(-) translation is driven by a previously unrecognized IRES-like element. Functional characterizations reveal that vsp1S4(-) localizes to the plasma membrane and acts as a negative regulator of viral replication. Mechanistically, vsp1S4(-) interacts directly with the viral RNAi suppressor NSP8, competitively disrupting the NSP8-AGO2 complex. This action restores the host's antiviral RNAi response, thereby limiting viral proliferation. Our findings challenge the conventional view of dsRNA virus coding capacity, unveil a novel viral immune evasion and replication control mechanism, and highlight antisense-encoded microproteins as potential targets for antiviral therapy.
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