PRRSV degrades MDA5 via dual autophagy receptors P62 and CCT2 to evade antiviral innate immunity

Ruiqi Sun; Yanyu Guo; Lilin Zhang; Huixia Zhang; Boxuan Yin; Xiaoyang Li; Changyan Li; Liu Yang; Lei Zhang; Zexing Li; Jinhai Huang

doi:10.1016/j.virs.2024.01.005

April 2024

Citation: Ruiqi Sun, Yanyu Guo, Lilin Zhang, Huixia Zhang, Boxuan Yin, Xiaoyang Li, Changyan Li, Liu Yang, Lei Zhang, Zexing Li, Jinhai Huang. PRRSV degrades MDA5 via dual autophagy receptors P62 and CCT2 to evade antiviral innate immunity .VIROLOGICA SINICA, 2024, 39(2) : 264-276. http://dx.doi.org/10.1016/j.virs.2024.01.005

PRRSV degrades MDA5 via dual autophagy receptors P62 and CCT2 to evade antiviral innate immunity

School of Life Sciences, Tianjin University, Tianjin, 300072, China

Corresponding author: Zexing Li, lizexing_21@tju.edu.cn
Jinhai Huang, jinhaih@tju.edu.cn
Received Date: 01 July 2023
Accepted Date: 15 January 2024
Available online: 23 January 2024

Abstract

Porcine reproductive and respiratory syndrome virus (PRRSV) is a major economically devastating pathogen that has evolved various strategies to evade innate immunity. Downregulation of antiviral interferon largely promotes PRRSV immunoevasion by utilizing cytoplasmic melanoma differentiation-associated gene 5 (MDA5), a receptor that senses viral RNA. In this study, the downregulated transcription and expression levels of porcine MDA5 in PRRSV infection were observed, and the detailed mechanisms were explored. We found that the interaction between P62 and MDA5 is enhanced due to two factors: the phosphorylation modification of the autophagic receptor P62 by the upregulated kinase CK2α and the K63 ubiquitination of porcine MDA5 catalyzed by the E3 ubiquitinase TRIM21 in PRRSV-infected cells. As a result of these modifications, the classic P62-mediated autophagy is triggered. Additionally, porcine MDA5 interacts with the chaperonin containing TCP1 subunit 2 (CCT2), which is enhanced by PRRSV nsp3. This interaction promotes the aggregate formation and autophagic clearance of MDA5-CCT2-nsp3 independently of ubiquitination. In summary, enhanced MDA5 degradation occurs in PRRSV infection via two autophagic pathways: the binding of MDA5 with the autophagy receptor P62 and the aggrephagy receptor CCT2, leading to intense innate immune suppression. The research reveals a novel mechanism of immune evasion in PRRSV infection and provides fundamental insights for the development of new vaccines or therapeutic strategies.
- Porcine reproductive and respiratory syndrome virus (PRRSV)
- , nsp3
- , Autophagy
- , MDA5

Electronic Supplementary Material

10.1016j.virs.2024.01.005-ESM.docx

10.1016j.virs.2024.01.003-ESM.pdf
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