Nature:SARS-CoV-2多个中和抗体结构被解析,为治疗提供依据

2020-10-12 haibei MedSci原创

COVID-19大流行带来了紧迫的健康危机。靶向宿主ACE2受体结合域(RBD)的SARS-CoV-2刺突蛋白的人中和抗体(hNAbs)显示出治疗前景,并正在进行临床评估。

COVID-19大流行带来了紧迫的健康危机。靶向宿主ACE2受体结合域(RBD)的SARS-CoV-2刺突蛋白的人中和抗体(hNAbs)显示出治疗前景,并正在进行临床评估。

为了确定中和SARS-CoV-2的结构相关性,最近,研究人员一口气解决了8个不同的COVID-19 hNAbs与SARS-CoV-2刺突三聚体或RBD复合的新结构。

通过结构比较可以将抗体分为几类。(1)具有短CDRH3s的VH3-53 hNAbs,阻断ACE2,仅与 "上 "RBDs结合;(2)阻断ACE2的hNAbs,同时与 "上 "和 "下 "RBDs结合,又能与相邻的RBDs接触;(3)在ACE2位点外结合,并识别 "向上 "和 "向下 "RBDs的hNAbs,以及(4)先前描述的不阻断ACE2,并仅结合 "上 "RBDs的抗体。

第2类抗体包括四个hNAbs,其表位桥接RBDs,包括一个VH3-53 hNAb,其使用一个长的CDRH3与疏水性尖端桥接相邻的 "向下 "RBDs,从而将刺突蛋白锁定到一个封闭的构象。

表位/副位图谱显示出与宿主衍生的N-聚糖的相互作用很少,抗体体型超突变对表位接触的贡献很小。亲和力测量和3D中自然发生的和体外选择的刺突蛋白突变体的图谱提供了对SARS-CoV-2从感染过程中引起的或治疗性递送的抗体中逃逸的可能性的深入了解。

这些分类和结构分析为将当前和未来的人类RBD靶向抗体分配到类别、评估狂热效应、建议临床使用的组合提供了规则,并提供了对SARS-CoV-2的免疫反应的见解。

 

原始出处:

Christopher O. Barnes et al. SARS-CoV-2 neutralizing antibody structures inform therapeutic strategies. Nature (2020). 

 

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    2021-09-23 hukaixun
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    2020-12-04 hongbochen
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    2021-08-03 liye789132251
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    2020-10-14 小刀医生

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