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• W3183354410 abstract "Since the D614G substitution in the spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerged, the variant strain has undergone a rapid expansion to become the most abundant strain worldwide. Therefore, this substitution may provide an advantage for viral spreading. To explore the mechanism, we analyzed 18 viral isolates containing S proteins with either G614 or D614 (S-G614 and S-D614, respectively). The plaque assay showed a significantly higher virus titer in S-G614 than in S-D614 isolates. We further found increased cleavage of the S protein at the furin substrate site, a key event that promotes syncytium formation, in S-G614 isolates. The enhancement of the D614G substitution in the cleavage of the S protein and in syncytium formation has been validated in cells expressing S protein. The effect on the syncytium was abolished by furin inhibitor treatment and mutation of the furin cleavage site, suggesting its dependence on cleavage by furin. Our study pointed to the impact of the D614G substitution on syncytium formation through enhanced furin-mediated S cleavage, which might increase the transmissibility and infectivity of SARS-CoV-2 strains containing S-G614. IMPORTANCE Analysis of viral genomes and monitoring of the evolutionary trajectory of SARS-CoV-2 over time has identified the D614G substitution in spike (S) as the most prevalent expanding variant worldwide, which might confer a selective advantage in transmission. Several studies showed that the D614G variant replicates and transmits more efficiently than the wild-type virus, but the mechanism is unclear. By comparing 18 virus isolates containing S with either D614 or G614, we found significantly higher virus titers in association with higher furin protease-mediated cleavage of S, an event that promotes syncytium formation and virus infectivity, in the S-G614 viruses. The effect of the D614G substitution on furin-mediated S cleavage and the resulting enhancement of the syncytium phenotype has been validated in S-expressing cells. This study suggests a possible effect of the D614G substitution on S of SARS-CoV-2; the antiviral effect through targeting furin protease is worthy of being investigated in proper animal models." @default.
• W3183354410 created "2021-08-02" @default.
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• W3183354410 date "2021-08-31" @default.
• W3183354410 modified "2023-10-14" @default.
• W3183354410 title "D614G Substitution of SARS-CoV-2 Spike Protein Increases Syncytium Formation and Virus Titer via Enhanced Furin-Mediated Spike Cleavage" @default.
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• W3183354410 doi "https://doi.org/10.1128/mbio.00587-21" @default.
• W3183354410 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8406174" @default.
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