West Nile virus 5' untranslated region (WNV 5' UTR)

The West Nile virus (WNV) 5' untranslated region (UTR) is a highly conserved segment of the viral genome that serves as a critical regulatory hub for both translation and replication. It contains essential structural elements, such as stem-loop A (SLA), which acts as a promoter for the viral RNA-dependent RNA polymerase (NS5), and sequences that facilitate the cyclization of the genome required for RNA synthesis. The translation start site within this region is the point where the host cell machinery begins synthesizing the viral polyprotein, making it a prime target for therapeutic intervention. By targeting this site with antisense agents like morpholino oligomers, researchers can sterically block ribosomal access, effectively silencing viral protein production. Because these RNA structures are highly conserved across different WNV strains, they represent a robust target for broad-spectrum antiviral development. Inhibiting the function of the 5' UTR not only prevents the formation of new viral particles but also disrupts the early stages of the viral life cycle within the host cell.

Other names

West Nile virus genomic RNA translation start siteWNV 5' non-coding regionWNV 5' NCRWest Nile virus stem-loop AWNV SLA

Antisense oligonucleotides or morpholinos bind to the 5' UTR or the translation start site (AUG) via complementary base pairing, sterically hindering the assembly of the ribosomal initiation complex and preventing the translation of the viral polyprotein. This inhibition of protein synthesis subsequently halts viral replication and assembly.