Infectious Bursal Disease Virus VP3 Upregulates VP1-Mediated RNA-Dependent RNA Replication.

Genome replication is a critical step in virus life cycles. Here, we analyzed the role of the infectious bursal disease virus (IBDV) VP3, a major component of IBDV ribonucleoprotein complexes, on the regulation of VP1, the virus-encoded RNA-dependent RNA polymerase (RdRp). Data show that VP3, as well as a peptide mimicking its C-terminal domain, efficiently stimulates the ability of VP1 to replicate synthetic single-stranded RNA templates containing the 3' untranslated regions (UTRs) from the IBDV genome segments.

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