The SARS-CoV-2 Spike variant D614G favors an open conformational state.

The SARS-CoV-2 Spike variant D614G favors an open conformational state.
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DOI:
10.1126/sciadv.abf3671
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Gnanakaran S
Gnanakaran S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Mansbach RA;Chakraborty S;Nguyen K;Montefiori DC;Korber B;Gnanakaran S

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D 614 G SARS-CoV-2 Spike中接触的对称性有利于感染能力构象的更大概率。COVID-19(2019年冠状病毒病)大流行经历了一个快速转变,出现了一种主要病毒变体(从“D型”到“G型”),其“刺突”蛋白中携带氨基酸取代D 614 G。G型在体外更具感染性,并且与上呼吸道中的病毒载量增加有关。为了深入了解这些特征的分子水平基础,我们使用微秒全原子模拟。我们发现,蛋白质能量学的变化有利于通过释放存在于D-型原异构体间相互作用中的不对称性,在G-型中具有较高的感染能力的状态。因此,G型的感染性增加可能是由于与宿主受体的有利结合遭遇率更高。由于受体结合结构域(中和抗体的关键靶区域)的暴露增强,还预测其具有更高的中和敏感性。这些结果对疫苗设计至关重要。
Symmetrization of contacts in D614G SARS-CoV-2 Spike favors greater probability of infection-capable conformation. The COVID-19 (coronavirus disease 2019) pandemic underwent a rapid transition with the emergence of a dominant viral variant (from the “D-form” to the “G-form”) that carried an amino acid substitution D614G in its “Spike” protein. The G-form is more infectious in vitro and is associated with increased viral loads in the upper airways. To gain insight into the molecular-level underpinnings of these characteristics, we used microsecond all-atom simulations. We show that changes in the protein energetics favor a higher population of infection-capable states in the G-form through release of asymmetry present in the D-form inter-protomer interactions. Thus, the increased infectivity of the G-form is likely due to a higher rate of profitable binding encounters with the host receptor. It is also predicted to be more neutralization sensitive owing to enhanced exposure of the receptor binding domain, a key target region for neutralizing antibodies. These results are critical for vaccine design.
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发表时间: 2020-12-18
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