Identification of Antibodies with Non-overlapping Neutralization Sites that Target Coxsackievirus A16.

Identification of Antibodies with Non-overlapping Neutralization Sites that Target Coxsackievirus A16.
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具有非重叠中和位点的针对柯萨奇病毒 A16 的抗体的鉴定。

DOI:
10.1016/j.chom.2020.01.003
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发表时间:
2020-02-12
影响因子:
30.3
通讯作者:
Xia N
Xia N
中科院分区:
医学1区
文献类型:
--
作者:
He M;Xu L;Zheng Q;Zhu R;Yin Z;Zha Z;Lin Y;Yang L;Huang Y;Ye X;Li S;Hou W;Wu Y;Han J;Liu D;Li Z;Chen Z;Yu H;Que Y;Wang Y;Yan X;Zhang J;Gu Y;Zhou ZH;Cheng T;Li S;Xia N

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手足口病是一种常见的儿童疾病,主要由柯萨奇病毒A16(CVA 16)引起,目前没有疫苗或治疗方法。我们鉴定了三种具有治疗潜力的CVA 16特异性中和单克隆抗体(nAb),18 A7、14 B10和NA 9D 7。我们目前的原子结构结合到所有三种病毒颗粒形式-成熟的病毒粒子,A-粒子和空粒子-这些抗体,并表明,每个Fab可以同时占据成熟的病毒粒子。另外,14 B10或NA 9D 7在新生小鼠模型中提供针对致死性CVA 16感染的100%保护。18 A7结合所有三种颗粒中存在的非保守表位,而14 B10和NA 9D 7识别广泛的保护性表位,但仅结合成熟病毒体。NA 9D 7靶向免疫显性位点,其可能与受体结合位点重叠。这些发现表明,CVA 16疫苗应基于成熟的病毒粒子,这些抗体可用于区分最佳的基于病毒粒子的免疫原。He等人描述了与三种不同的中和mAb复合的三种形式的柯萨奇病毒A16的各种原子结构,并绘制了中和位点。他们认为成熟病毒体是疫苗开发的最佳免疫原,并设计了一种免疫测定法来特异性定量这种病毒体状态。
Hand-foot-and-mouth disease is a common childhood illness primarily caused by coxsackievirus A16 (CVA16), for which there are no current vaccines or treatments. We identify three CVA16-specific neutralizing monoclonal antibodies (nAbs) with therapeutic potential, 18A7, 14B10, and NA9D7. We present atomic structures of these nAbs bound to all three viral particle forms --the mature virion, A-particle and empty particle-- and show that each Fab can simultaneously occupy the mature virion. Additionally, 14B10 or NA9D7 provide 100% protection against lethal CVA16 infection in a neonatal mouse model. 18A7 binds to a non-conserved epitope present in all three particles, whereas 14B10 and NA9D7 recognize broad protective epitopes but only bind the mature virion. NA9D7 targets an immunodominant site, which may overlap the receptor binding site. These findings indicate that CVA16 vaccines should be based on mature virions and that these antibodies could be used to discriminate optimal virion-based immunogens. He et al. describe a variety of atomic structures for three forms of coxsachievirus A16 complexed with three distinct neutralizing mAbs, and map the neutralization sites. They suggest that the mature virion is the optimal immunogen for vaccine development and design an immune assay to specifically quantify such virion state.
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