A high-affinity antibody against the CSP N-terminal domain lacks Plasmodium falciparum inhibitory activity.

A high-affinity antibody against the CSP N-terminal domain lacks Plasmodium falciparum inhibitory activity.
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DOI:
10.1084/jem.20200061
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发表时间:
2020-11-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Levashina EA
Levashina EA
中科院分区:
其他
文献类型:
--
作者:
Thai E;Costa G;Weyrich A;Murugan R;Oyen D;Flores-Garcia Y;Prieto K;Bosch A;Valleriani A;Wu NC;Pholcharee T;Scally SW;Wilson IA;Wardemann H;Julien JP;Levashina EA

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抑制性和非抑制性抗体的分子表征有助于疫苗设计。在这里,我们表明,高亲和力的单克隆抗体5D 5对PfCSP的N-末端的子孢子不抑制Pf入侵。这一信息对于确定脆弱性功能位点的优先次序以纳入下一代疟疾免疫原设计至关重要。疟疾是一个全球性的健康问题,研究工作正在进行,以开发一种上级疫苗RTS,S/AS 01。为了指导免疫原设计,我们寻求对恶性疟原虫(Pf)环子孢子蛋白(PfCSP)的保护性体液反应的全面了解。与对重复区和C-末端的充分研究的应答相反,针对PfCSP的N-末端结构域(N-CSP)的抗体应答仍然不清楚。在这里,我们表征了N-CSP特异性单克隆抗体5D 5的分子识别和功能功效。1.85-kDa分辨率的晶体结构显示,5D 5通过广泛的形状和电荷互补性以及抗体N-连接聚糖的不寻常利用以高亲和力结合N-CSP中的α-螺旋表位。然而,功能研究表明,低5D 5结合活Pf子孢子和缺乏子孢子抑制在体外和体内。总体而言,我们的数据不支持将5D 5 N-CSP表位纳入下一代基于CSP的疫苗中。
Molecular characterization of inhibitory and non-inhibitory antibodies contributes to vaccine design. Here, we show that the high-affinity mAb 5D5 against the PfCSP N-terminus of sporozoites does not inhibit Pf invasion. This information is critical for the prioritization of functional sites of vulnerability to include in next-generation malaria immunogen designs. Malaria is a global health concern, and research efforts are ongoing to develop a superior vaccine to RTS,S/AS01. To guide immunogen design, we seek a comprehensive understanding of the protective humoral response against Plasmodium falciparum (Pf) circumsporozoite protein (PfCSP). In contrast to the well-studied responses to the repeat region and the C-terminus, the antibody response against the N-terminal domain of PfCSP (N-CSP) remains obscure. Here, we characterized the molecular recognition and functional efficacy of the N-CSP–specific monoclonal antibody 5D5. The crystal structure at 1.85-Å resolution revealed that 5D5 binds an α-helical epitope in N-CSP with high affinity through extensive shape and charge complementarity and the unusual utilization of an antibody N-linked glycan. Nevertheless, functional studies indicated low 5D5 binding to live Pf sporozoites and lack of sporozoite inhibition in vitro and in vivo. Overall, our data do not support the inclusion of the 5D5 N-CSP epitope into the next generation of CSP-based vaccines.
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