Fusion Peptide of SARS-CoV-2 Spike Rearranges into a Wedge Inserted in Bilayered Micelles.

Fusion Peptide of SARS-CoV-2 Spike Rearranges into a Wedge Inserted in Bilayered Micelles.
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SARS-COV-2尖峰的融合肽重新排列到插入双层胶束的楔形物中。

DOI:
10.1021/jacs.1c05435
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发表时间:
2021-08-25
影响因子:
15
通讯作者:
Van Doren SR
Van Doren SR
中科院分区:
化学1区
文献类型:
--
作者:
Koppisetti RK;Fulcher YG;Van Doren SR

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SARS-CoV-2的Spike蛋白通过与受体结合和蛋白水解作用,释放出S2亚基,重排并催化病毒与细胞的融合。这使融合肽展开以插入靶向的细胞膜中。我们表明,这种融合肽从内在的混乱在溶液中转化成插入在双层胶束的楔形结构,根据化学位移,15 N NMR弛豫,和NOES。球状折叠的三个螺旋对比开放,扩展的形式观察到该地区的电子密度紧凑的prefusion状态。在楔形的疏水性窄端,螺旋1和2接触磷脂的脂肪酰基链,根据NOE和接近膜模拟物深处的氮氧自旋标记。楔的极性端可以接合和置换脂质头基并结合用于膜融合的Ca 2+离子。极性螺旋3从双层突出,在那里它可能被抗体接近。
The receptor binding and proteolysis of Spike of SARS-CoV-2 release its S2 subunit to rearrange and catalyze viral-cell fusion. This deploys the fusion peptide for insertion into the cell membranes targeted. We show that this fusion peptide transforms from intrinsic disorder in solution into a wedge-shaped structure inserted in bilayered micelles, according to chemical shifts, 15N NMR relaxation, and NOEs. The globular fold of three helices contrasts the open, extended forms of this region observed in the electron density of compact prefusion states. In the hydrophobic, narrow end of the wedge, helices 1 and 2 contact the fatty acyl chains of phospholipids, according to NOEs and proximity to a nitroxide spin label deep in the membrane mimic. The polar end of the wedge may engage and displace lipid head groups and bind Ca2+ ions for membrane fusion. Polar helix 3 protrudes from the bilayer where it might be accessible to antibodies.
DOI: 10.1021/jacs.1c02394
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