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PRRSV causes major economic losses to swine industry world-wide, which requires innovative antiviral agents. Porcine scavenger receptor CD163 has been identified as an essential fusion receptor for Porcine reproductive and respiratory Syndrome Virus (PRRSV) infection. In this study, novel antiviral peptides from pCD163 against PRRSV were developed based on broad neutralizing monoclonal antibodies. SRCR-5-9 of pCD163 from baculovirus efficiently binds to PRRSVs of lineage 8 and lineage 1, blocking infection in PAMs. A batch of monoclonal antibodies targeting SRCR-5-9 were generated and characterized. 8H2 and 4H7 block PRRSV infection by the disruption in viral attachment to PAMs. Virus titer reduced 100-1000 folds in average and the virus copy number decreased about 104 folds with these antibodies. Linear epitopes of 8H2 and 4H7 were individually localized in SRCR6 (1-30 aa) and PSTI(1-15aa) of pCD163. Mutations of SRCR6 NI1718KT and PST SS1314AA abolished the recognition of 8H2 and 4H7 to the corresponding region individually. Peptides derived from the linear epitopes displayed a broad inhibitory effect on PRRSVs of different lineages in a dose-dependent manner and further modulated PRRSV-related NF-κB pathway. In conclusion, these findings deepen the understanding in the interaction between PRRSV and pCD163 receptor and provide alternative universal antiviral strategies against PRRSV.
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