Structural basis of SARS-CoV-2 Omicron immune evasion and receptor engagement.

Structural basis of SARS-CoV-2 Omicron immune evasion and receptor engagement.
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DOI:
10.1126/science.abn8652
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发表时间:
2022-02-25
期刊:
影响因子:
56.9
通讯作者:
Veesler, David
Veesler, David
中科院分区:
综合性期刊1区
文献类型:
--
作者:
McCallum, Matthew;Czudnochowski, Nadine;Rosen, Laura E.;Zepeda, Samantha K.;Bowen, John E.;Walls, Alexandra C.;Hauser, Kevin;Joshi, Anshu;Stewart, Cameron;Dillen, Josh R.;Powell, Abigail E.;Croll, Tristan, I;Nix, Jay;Virgin, Herbert W.;Corti, Davide;Snell, Gyorgy;Veesler, David

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SARS-CoV-2 Omicron变异体由于大量刺突突变的积累,逃避了来自接种疫苗或感染早期变异体的抗体介导的免疫。为了了解Omicron抗原性变化,我们测定了与广泛中和的肉瘤病毒单克隆抗体(mAb)S309(sotrovimab的母体mAb)和人ACE 2受体结合的刺突蛋白和受体结合结构域的冷冻电子显微镜和X射线晶体结构。我们提供了一个蓝图,以了解其他治疗性mAb结合的显着减少,导致中和活性减弱。Omicron受体结合结构域和人ACE 2之间相互作用的重塑可能解释了相对于祖先病毒对宿主受体的亲和力增强。
The SARS-CoV-2 Omicron variant of concern evades antibody-mediated immunity that comes from vaccination or infection with earlier variants due to accumulation of numerous spike mutations. To understand the Omicron antigenic shift, we determined cryo-electron microscopy and X-ray crystal structures of the spike protein and the receptor-binding domain bound to the broadly neutralizing sarbecovirus monoclonal antibody (mAb) S309 (the parent mAb of sotrovimab) and to the human ACE2 receptor. We provide a blueprint for understanding the marked reduction of binding of other therapeutic mAbs that leads to dampened neutralizing activity. Remodeling of interactions between the Omicron receptor-binding domain and human ACE2 likely explains the enhanced affinity for the host receptor relative to the ancestral virus.
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