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Myh9 Key Amino Acid Residues Identified By The Anti-Idiotypic Antibody To Porcine Reproductive And Respiratory Syndrome Virus Glycoprotein 5 Involve In The Virus Internalization By Porcine Alveolar Macrophages

文献类型： 外文期刊

作者： Li, LL; Zhang, L; Hu, QF; Zhao, L; Nan, YC; Hou, GP; Chen, YY; Han, XM; Ren, XL; Zhao, Q; Tao, H; Sun, ZZ; Zhang, GP; Wu, CY; Wang, JF; Zhou, EM

作者机构：

关键词： Myh9; Anti-Idiotype; Prrsv; Prrsv Gp5; Pathogenesis

期刊名称： VIRUSES-BASEL

ISSN： 1999-4915

年卷期： 2020 年 12 卷 1 期

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收录情况： JCR（2021版）

摘要： MYH9 has been identified as an indispensable cellular protein for porcine reproductive and respiratory syndrome virus (PRRSV) entry into permissive cells using the monoclonal anti-idiotypic antibody (Mab2-5G2) recognizing an antibody that specifically interacts with PRRSV glycoprotein 5 (GP5). More recently, we found that Mab2-5G2 interacted with the MYH9 C-terminal domain, designated PRA, which is required for PRRSV internalization. In this study, we demonstrate that blocking of MYH9 with Mab2-5G2 significantly diminished PRRSV internalization by porcine alveolar macrophage (PAM) via interruption of direct interaction between GP5 and MYH9, and thus remarkably inhibited subsequent infection of PAMs by PRRSV-2 isolates. Moreover, the three-dimensional structure of the Mab2-5G2 Fab-PRA complex determined via homology modeling predicted potential docking sites required for PRRSV internalization. Further analysis of Mab2-5G2-binding sites within PRA highlighted that the amino acids E1670, K1673, E1679, and I1683 in PRA are the key Mab2-5G2-binding residues. Notably, recombinant PRA protein blocked the interaction between PRRSV GP5 and cellular MYH9 by preventing translocation of MYH9 from the cytoplasm to the cell membrane, an essential step for PRRSV virion internalization. Meanwhile, porcine cell line permissive for PRRSV bearing point mutation of E1670A in MYH9 demonstrated reduced susceptibility for PRRSV infection. In conclusion, this work increases understanding of both PRRSV pathogenesis and the mechanistic role played by MYH9 in PRRSV infection.

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