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Journal Article
Research Support, Non-U.S. Gov't
Inhibition of Japanese encephalitis virus (JEV) replication by specific RNA aptamer against JEV methyltransferase.
Biochemical and Biophysical Research Communications 2017 January 30
Japanese encephalitis virus (JEV) is the most common etiological agent of epidemic viral encephalitis. JEV encodes a single methyltransferase (MTase) domain located at the N-terminal region of the viral nonstructural protein NS5. JEV MTase is essential for viral replication and specifically catalyzes methylation of the viral RNA cap, which occurs exclusively in the cytoplasm. Therefore, JEV MTase is a potential target for antiviral therapy. Here, we identified specific and avid RNA aptamer (Kd ∼ 12 nM) with modified 2'-O-methyl pyrimidines against JEV MTase. The RNA aptamer efficiently inhibited viral cap methylation activity of MTase and interfered with JEV production in cells. Moreover, we generated a 24-mer truncated aptamer that could specifically bind to JEV MTase with high affinity (Kd ∼16 nM). The 24-mer aptamer efficiently inhibited JEV production and replication in cells. Therefore, MTase-specific RNA aptamer might be useful as an anti-JEV agent.
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