SARS-CoV-2 ORF8 reshapes the ER through forming mixed disulfides with ER oxidoreductases

Redox Biology

Fang Cheng¹  Junjie Hu¹  Yiwei Sun²  Chih-chen Wang³  Hong Zhang³  Ping Liu⁴  Lei Wang⁴  Fuquan Yang⁴  Jifeng Wang⁴  Xi Wang⁴  Hongyu Zhao⁴ 

[1]College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

[2]Corresponding author.

[3]Laboratory of Proteomics, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China

[4]National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China

关键词: Endoplasmic reticulum;    ORF8;    Redox;    SARS-CoV-2;    Unfolded protein response;   

DOI  :  

来源: DOAJ

【 摘 要 】

The replication machinery of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is closely associated with the endoplasmic reticulum (ER) in host cells. Activation of the unfolded protein response (UPR) is a strategy hijacked by coronavirus to facilitate its replication and suppress host innate immunity. Here, we have found that SARS-CoV-2 ORF8 protein accumulates in the ER and escapes the degradation system by forming mixed disulfide complexes with ER oxidoreductases. ORF8 induces the activation of three UPR pathways through targeting key UPR components, remodels ER morphology and accelerates protein trafficking. Moreover, small molecule reducing agents release ORF8 from the mixed disulfide complexes and facilitate its degradation, therefore mitigate ER stress. Our study reveals a unique mechanism by which SARS-CoV-2 ORF8 escapes degradation by host cells and regulates ER reshaping. Targeting ORF8-involved mixed disulfide complexes could be a new strategy to alleviate SARS-CoV-2 induced ER stress and related diseases.

【 授权许可】

Unknown