Replication of positive-strand RNA viruses involves translation of polyproteins which are proteolytically processed into functional peptides. These maturation steps often involve virus-encoded autoproteases specialized in generating their own N or C termini. Nonstructural protein 2 (NS2) of the pestivirus bovine viral diarrhea virus represents such an enzyme. Bovine viral diarrhea virus NS2 creates in cis its own C terminus and thereby releases an essential viral replication factor. As a unique feature, this …
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