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The porcine reproductive and respiratory syndrome virus (PRRSV) replicase polyproteins pp1a and pp1ab are proteolytically processed by four proteases encoded in ORF1a. In this study, a large set of PRRSV replicase cleavage products were identified and pp1a cleavage sites were verified by using a combination of bioinformatics, proteomics, immunoprecipitation, and site-directed mutagenesis. For genotype...
ORF5a protein was recently identified as a novel structural protein in porcine reproductive and respiratory syndrome virus (PRRSV). The ORF5a protein possesses two cysteines at positions 29 and 30 that are highly conserved among type 2 PRRSV. In this study, the significance of the ORF5a protein cysteine residues on virus replication was determined based on a type 2 PRRSV cDNA clone (pAJXM). Each cysteine...
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