ArticleNucleic acids research2026
Interdependent RNA structural motifs at the 3'-terminus of the West Nile virus genome regulate viral growth.
Article in Nucleic acids research, 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
The RNA genome of West Nile virus (WNV) folds into an elaborate series of RNA structural elements that are crucial for viral function. Among these elements, four pseudoknots (PKs) at the viral 3'-terminus, designated as SLII, SLIV, DBI, and DBII, are among the most crucial players in the overall flaviviral lifecycle. While many studies have focused on exploring the behavior of individual PKs, we investigated the collective role of all four PKs in viral growth and subgenomic flaviviral RNA (sfRNA) formation. Through mutational analyses and infectious models, we establish that the four PKs are interdependent and work synergistically to aid in the folding and compaction of the WNV 3'-terminal region. A striking hierarchy is observed in PK contributions to global folding and sfRNA formation, whereby SLIV plays the largest role, followed by DBI, DBII, and SLII. We also discover highly conserved RNA tertiary motifs within the PK assembly that are shared across flaviviruses, suggesting a new type of druggable target that may be of value in the search for pan-flaviviral therapeutics.
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