51. Zebrafish RPZ5 Degrades Phosphorylated IRF7 To Repress Interferon Production.
- Author
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Long-Feng Lu, Xiao-Yu Zhou, Can Zhang, Zhuo-Cong Li, Dan-Dan Chen, Shu-Bo Liu, and Shun Li
- Subjects
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ZEBRA danio , *INTERFERON regulatory factors , *BRACHYDANIO , *INTERFERONS , *VIRUS diseases , *HOST-virus relationships - Abstract
Interferon (IFN) production activated by phosphorylated interferon regulatory factor 7 (IRF7) is a pivotal process during host antiviral infection. For viruses, suppressing the host IFN response is beneficial for viral proliferation; in such cases, evoking host-derived IFN negative regulators would be very useful for viruses. Here, we report that the zebrafish rapunzel 5 (RPZ5) protein which activated by virus degraded phosphorylated IRF7 is activated by TANK-binding kinase 1 (TBK1), leading to a reduction in IFN production. Upon viral infection, zebrafish rpz5 was significantly upregulated, as was ifn, in response to the stimulation. Overexpression of RPZ5 blunted the IFN expression induced by both viral and retinoic acid-inducible gene I (RIG-I) like-receptor (RLR) factors. Subsequently, RPZ5 interacted with RLRs but did not affect the stabilization of the proteins in the normal state. Interestingly, RPZ5 degraded the phosphorylated IRF7 under TBK1 activation through K48-linked ubiquitination. Finally, the overexpression of RPZ5 remarkably reduced the host cell antiviral capacity. These findings suggest that zebrafish RPZ5 is a negative regulator of phosphorylated IRF7 and attenuates IFN expression during viral infection, providing insight into the IFN balance mechanism in fish. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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