期刊
VIRUSES-BASEL
卷 13, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/v13010047
关键词
coronavirus disease 2019; COVID-19; severe acute respiratory syndrome coronavirus 2; SARS-CoV-2; nucleocapsid; interferon; IFN; retinoic acid-inducible gene I; RIG-I
类别
资金
- National Natural Science Foundation of China [81730061]
- Guangdong Province Pearl River Talent Plan Innovation and Entrepreneurship Team Project [2017ZT07Y580]
The nucleocapsid (N) protein of SARS-CoV-2 plays a crucial role in inhibiting interferon beta production by interacting with the key component RIG-I in the RNA recognition pathway, potentially affecting the host's immune response.
SARS-CoV-2 is highly pathogenic in humans and poses a great threat to public health worldwide. Clinical data shows a disturbed type I interferon (IFN) response during the virus infection. In this study, we discovered that the nucleocapsid (N) protein of SARS-CoV-2 plays an important role in the inhibition of interferon beta (IFN-beta) production. N protein repressed IFN-beta production induced by poly(I:C) or upon Sendai virus (SeV) infection. We noted that N protein also suppressed IFN-beta production, induced by several signaling molecules downstream of the retinoic acid-inducible gene I (RIG-I) pathway, which is the crucial pattern recognition receptor (PRR) responsible for identifying RNA viruses. Moreover, our data demonstrated that N protein interacted with the RIG-I protein through the DExD/H domain, which has ATPase activity and plays an important role in the binding of immunostimulatory RNAs. These results suggested that SARS-CoV-2 N protein suppresses the IFN-beta response through targeting the initial step, potentially the cellular PRR-RNA-recognition step in the innate immune pathway. Therefore, we propose that the SARS-CoV-2 N protein represses IFN-beta production by interfering with RIG-I.
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