Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most important viral pathogens that has caused tremendous economic losses to the swine industry worldwide. Although extensive research has been focused on PRRSV, little is known about the structure and biological functions of individual nonstructural viral proteins, especially the nonstructural protein 12 (Nsp12). In this study, we generated and identified the monoclonal antibody (mAb) against PRRSV Nsp12. Six strains of hybridoma cells named 2B10, 2B12, 5E1, 5G6, 5E7, and 8B2 secreting anti-Nsp12 mAbs were obtained by the hybridoma technique. All the mAbs were specifically reacted with PRRSV by indirect immunofluorescence assay and four of them (2B12, 5E1, 5G6, and 5E7) were specifically reacted by Western blot. Furthermore, the 5E7 specifically recognized multiple type 2 PRRSV strains, including highly pathogenic and classical PRRSV strains, but not type 1 PRRSV strain. Taken together, the mAbs against Nsp12 provide a valuable tool to specifically recognize type 2 PRRSV as a diagnostic reagent and study the biological function of Nsp12 in the future.
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