Evidence of VP1 of duck hepatitis A type 1 virus as a target of neutralizing antibodies and involving receptor-binding activity

文献类型： 外文期刊

第一作者： Li, Xiaojun

作者： Li, Xiaojun;Zhao, Ran;Li, Chenxi;Zhang, Tingting;Meng, Fanyi;Liu, Ming;Zhang, Yun;Lin, Wei

作者机构：

关键词： Duck hepatitis A type 1 virus;VP1 protein;Receptor;Neutralizing antibody

期刊名称：VIRUS RESEARCH （ 影响因子：3.303； 五年影响因子：3.445 ）

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收录情况： SCI

摘要： The VP1 protein of the foot-and-mouth disease virus (FMDV) is a major target of neutralizing antibodies and is responsible for viral attachment to permissive cells via an RGD motif. VP1 of duck hepatitis A type 1 virus (DHAV-1) does not contain any RGD motif. To investigate the antibody and receptor-binding properties of DHAV-1, VP1 has been expressed as a His fusion protein (His-VP1) in baculovirus system. Sera against His-VP1 raised in rabbits effectively neutralized DHAV-1 infection in vitro and in vivo. A flow cytometry binding assay indicated that His-VP1 bound to duck embryo fibroblast cell (DEF) surface receptors. This binding was reduced in a dose-dependent manner by the addition of purified DHAV-1 virions, demonstrating the specificity of this interaction. A separate cell-binding assay also implicated His-VP1 in receptor binding. Importantly, anti-His-VP1 antibodies inhibited the binding of DHAV-1 virions to DEF cells, suggesting that these antibodies exert their neutralizing activity by blocking viral attachment. Similar to the counterpart of FMDV, DHAV-1 VP1 appears to be involved in receptor binding activity and a target of protective antibodies. This study confirms the potential of recombinant VP1 protein to serve as vaccine and diagnostic reagents for the control of DHAV-1 infections. (C) 2016 Elsevier B.V. All rights reserved.

分类号： R37

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