Functional evaluation of the P681H mutation on the proteolytic activation of the SARS-CoV-2 variant B.1.1.7 (Alpha) spike.

Functional evaluation of the P681H mutation on the proteolytic activation of the SARS-CoV-2 variant B.1.1.7 (Alpha) spike.
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DOI:
10.1016/j.isci.2021.103589
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发表时间:
2022-01-21
期刊:
影响因子:
5.8
通讯作者:
Whittaker GR
Whittaker GR
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Lubinski B;Fernandes MHV;Frazier L;Tang T;Daniel S;Diel DG;Jaimes JA;Whittaker GR

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严重急性呼吸系统综合征冠状病毒2(SARS-CoV-2)是引起COVID-19大流行的病原体。SARS-CoV-2 B.1.1.7(Alpha)是2020年底在英国首次发现的一种世卫组织关注的变异体,含有几个突变,包括刺突S1/S2切割位点的P681 H,预计这会增加弗林蛋白酶的切割,可能影响病毒进入细胞。在这里,我们研究了P681 H突变在B.1.1.7细胞进入中的作用。我们使用模拟武汉-胡-1和B.1.1.7 S1/S2序列的荧光肽进行测定,并观察到弗林蛋白酶切割无显著差异。使用携带SARS-CoV-2刺突的假颗粒进行的功能测定和细胞间融合测定表明,武汉-Hu-1、B.1.1.7或P681 H点突变体之间没有差异。同样,我们在细胞培养物中观察到USA-WA 1/2020和B.1.1.7分离株之间的病毒生长无差异。我们的研究结果表明,尽管B.1.1.7 P681 H突变可能会略微增加S1/S2裂解,但这不会显著影响病毒进入或细胞间传播。SARS-CoV-2 B.1.1.7刺突中的P681 H突变预计会增强病毒感染P681 H不会显著影响弗林蛋白酶切割、病毒进入或细胞间传播SARS-CoV-2 B.1.1.7 VOC中的其他突变可能会导致感染率增加病毒学
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the agent causing the COVID-19 pandemic. SARS-CoV-2 B.1.1.7 (Alpha), a WHO variant of concern first identified in the United Kingdom in late 2020, contains several mutations including P681H in the spike S1/S2 cleavage site, which is predicted to increase cleavage by furin, potentially impacting the viral cell entry. Here, we studied the role of the P681H mutation in B.1.1.7 cell entry. We performed assays using fluorogenic peptides mimicking the Wuhan-Hu-1 and B.1.1.7 S1/S2 sequence and observed no significant difference in furin cleavage. Functional assays using pseudoparticles harboring SARS-CoV-2 spikes and cell-to-cell fusion assays demonstrated no differences between Wuhan-Hu-1, B.1.1.7, or a P681H point mutant. Likewise, we observed no differences in viral growth between USA-WA1/2020 and a B.1.1.7 isolate in cell culture. Our findings suggest that, although the B.1.1.7 P681H mutation may slightly increase S1/S2 cleavage, this does not significantly impact viral entry or cell-cell spread. SARS-CoV-2 B.1.1.7 P681H mutation in the spike is predicted to enhance viral infection P681H does not significantly impact furin cleavage, viral entry, or cell-cell spread Other mutations in the SARS-CoV-2 B.1.1.7 VOC may account for increased infection rates Virology
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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