Amino acid residues Ala283 and His421 in the RNA-dependent RNA polymerase of porcine reproductive and respiratory syndrome virus play important roles in viral ribavirin sensitivity and quasispecies diversity.

Abstract excerpt

The quasispecies diversity of RNA viruses is mainly determined by the fidelity of RNA-dependent RNA polymerase (RdRp) during viral RNA replication. Certain amino acid residues play an important role in determining the fidelity, and such residues can be substituted with other amino acids to produce virus strains with higher fidelity. In this study, two amino acid substitutions (A283T and H421Y) in the RdRp of...

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