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Evasion of Neutralizing Antibody Response by the SARS-CoV-2 BA.2.75 Variant.


ABSTRACT: The newly emerged BA.2.75 SARS-CoV-2 variant exhibits an alarming 9 additional mutations in its spike (S) protein compared to the ancestral BA.2 variant. Here we examine the neutralizing antibody escape of BA.2.75 in mRNA-vaccinated and BA.1-infected individuals, as well as the molecular basis underlying functional changes in the S protein. Notably, BA.2.75 exhibits enhanced neutralization resistance over BA.2, but less than the BA.4/5 variant. The G446S and N460K mutations of BA.2.75 are primarily responsible for its enhanced resistance to neutralizing antibodies. The R493Q mutation, a reversion to the prototype sequence, reduces BA.2.75 neutralization resistance. The mutational impact is consistent with their locations in common neutralizing antibody epitopes. Further, the BA.2.75 variant shows enhanced cell-cell fusion over BA.2, driven largely by the N460K mutation, which enhances S processing. Structural modeling revealed a new receptor contact introduced by N460K, supporting a mechanism of potentiated receptor utilization and syncytia formation.

SUBMITTER: Qu P 

PROVIDER: S-EPMC9413709 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature

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Evasion of Neutralizing Antibody Response by the SARS-CoV-2 BA.2.75 Variant.

Qu Panke P   Evans John P JP   Zheng Yi-Min YM   Carlin Claire C   Saif Linda J LJ   Oltz Eugene M EM   Xu Kai K   Gumina Richard J RJ   Liu Shan-Lu SL  

bioRxiv : the preprint server for biology 20220815


The newly emerged BA.2.75 SARS-CoV-2 variant exhibits an alarming 9 additional mutations in its spike (S) protein compared to the ancestral BA.2 variant. Here we examine the neutralizing antibody escape of BA.2.75 in mRNA-vaccinated and BA.1-infected individuals, as well as the molecular basis underlying functional changes in the S protein. Notably, BA.2.75 exhibits enhanced neutralization resistance over BA.2, but less than the BA.4/5 variant. The G446S and N460K mutations of BA.2.75 are primar  ...[more]

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