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SARS-CoV-2 NSP12 Protein Is Not an Interferon-beta Antagonist #MMPMID34133897
Li A; Zhao K; Zhang B; Hua R; Fang Y; Jiang W; Zhang J; Hui L; Zheng Y; Li Y; Zhu C; Wang PH; Peng K; Xia Y
J Virol 2021[Aug]; 95 (17): e0074721 PMID34133897show ga
The coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is bringing an unprecedented health crisis to the world. To date, our understanding of the interaction between SARS-CoV-2 and host innate immunity is still limited. Previous studies reported that SARS-CoV-2 nonstructural protein 12 (NSP12) was able to suppress interferon-beta (IFN-beta) activation in IFN-beta promoter luciferase reporter assays, which provided insights into the pathogenesis of COVID-19. In this study, we demonstrated that IFN-beta promoter-mediated luciferase activity was reduced during coexpression of NSP12. However, we could show NSP12 did not affect IRF3 or NF-kappaB activation. Moreover, IFN-beta production induced by Sendai virus (SeV) infection or other stimulus was not affected by NSP12 at mRNA or protein level. Additionally, the type I IFN signaling pathway was not affected by NSP12, as demonstrated by the expression of interferon-stimulated genes (ISGs). Further experiments revealed that different experiment systems, including protein tags and plasmid backbones, could affect the readouts of IFN-beta promoter luciferase assays. In conclusion, unlike as previously reported, our study showed SARS-CoV-2 NSP12 protein is not an IFN-beta antagonist. It also rings the alarm on the general usage of luciferase reporter assays in studying SARS-CoV-2. IMPORTANCE Previous studies investigated the interaction between SARS-CoV-2 viral proteins and interferon signaling and proposed that several SARS-CoV-2 viral proteins, including NSP12, could suppress IFN-beta activation. However, most of these results were generated from IFN-beta promoter luciferase reporter assay and have not been validated functionally. In our study, we found that, although NSP12 could suppress IFN-beta promoter luciferase activity, it showed no inhibitory effect on IFN-beta production or its downstream signaling. Further study revealed that contradictory results could be generated from different experiment systems. On one hand, we demonstrated that SARS-CoV-2 NSP12 could not suppress IFN-beta signaling. On the other hand, our study suggests that caution needs to be taken with the interpretation of SARS-CoV-2-related luciferase assays.
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J+Virol 2021 ; 95 (17): e0074721
