The nsp1α and nsp1β papain-like autoproteinases are essential for porcine reproductive and respiratory syndrome virus RNA synthesis

Abstract excerpt

The two N-terminal cleavage products, nsp1alpha and nsp1beta, of the replicase polyproteins of porcine reproductive and respiratory syndrome virus (PRRSV) each contain a papain-like autoproteinase domain, which have been named PCPalpha and PCPbeta, respectively. To assess their role in the PRRSV life cycle, substitutions and deletions of the presumed catalytic cysteine and histidine residues of PCPalpha and...

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