A humanized nanobody phage display library yields potent binders of SARS CoV-2 spike.

A humanized nanobody phage display library yields potent binders of SARS CoV-2 spike.
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DOI:
10.1371/journal.pone.0272364
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
--
中科院分区:
综合性期刊3区
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--
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针对SARS-CoV-2刺突蛋白的中和抗体已显示出巨大的预防/治疗潜力。在这里,我们报告了一种快速而有效的策略,用于开发和设计具有亚纳米分子亲和力和纳米分子势的SARS-CoV-2中和人源化纳米体结构。基于低温电子显微镜的结构分析揭示了两种截然不同的结合模式。最有效的纳米体,RBD-1-2G(NCATS-BL8125),耐受N501Y RBD突变,并仍然能够中和B.1.1.7(Alpha)变体。分子动力学模拟为理解专门关注RBD上有和没有N501Y突变的Spike-ACE2界面的纳米体的中和过程提供了结构基础。初步建立的人呼吸道空气-肺界面(ALI)体外模型显示,RBD-1-2G-Fc抗体治疗可有效降低WA1和B.1.1.7SARS-CoV-2感染后的病毒载量。因此,这一提出的战略将作为一种工具来减轻新出现的SARS-CoV-2变种的威胁。
Neutralizing antibodies targeting the SARS-CoV-2 spike protein have shown a great preventative/therapeutic potential. Here, we report a rapid and efficient strategy for the development and design of SARS-CoV-2 neutralizing humanized nanobody constructs with sub-nanomolar affinities and nanomolar potencies. CryoEM-based structural analysis of the nanobodies in complex with spike revealed two distinct binding modes. The most potent nanobody, RBD-1-2G(NCATS-BL8125), tolerates the N501Y RBD mutation and remains capable of neutralizing the B.1.1.7 (Alpha) variant. Molecular dynamics simulations provide a structural basis for understanding the neutralization process of nanobodies exclusively focused on the spike-ACE2 interface with and without the N501Y mutation on RBD. A primary human airway air-lung interface (ALI) ex vivo model showed that RBD-1-2G-Fc antibody treatment was effective at reducing viral burden following WA1 and B.1.1.7 SARS-CoV-2 infections. Therefore, this presented strategy will serve as a tool to mitigate the threat of emerging SARS-CoV-2 variants.
SARS-COV-2血统的估计可传播和影响B.1.1.7在英国。
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发表时间: 2021-04-09
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影响因子: --
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