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2016 ; 26
(5
): 613-28
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gab.com Text
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TRIM9 short isoform preferentially promotes DNA and RNA virus-induced production
of type I interferon by recruiting GSK3? to TBK1
#MMPMID26915459
Qin Y
; Liu Q
; Tian S
; Xie W
; Cui J
; Wang RF
Cell Res
2016[May]; 26
(5
): 613-28
PMID26915459
show ga
Type I interferon (IFN) is an important component of antiviral innate immune
signaling mediated by viral DNA and RNA recognition by the DNA sensor cGAS and
RNA sensors RIG-I and MDA5. Activation of these DNA and RNA sensors leads to the
recruitment of STING and MAVS, respectively, and converges on TANK-binding kinase
1 (TBK1) signaling for subsequent phosphorylation of IFN regulatory factor 3
(IRF3). However, the mechanisms that control TBK1 activation are still poorly
defined. Here, we identify tripartite motif 9 short isoform (TRIM9s) as a
positive regulator in type I IFN signaling. Upon viral infection, TRIM9s
undergoes Lys-63-linked auto-polyubiquitination and serves as a platform to
bridge GSK3? to TBK1, leading to the activation of IRF3 signaling. Interestingly,
we found that TRIM9s selectively inhibits the production of pro-inflammatory
cytokines, but enhances the expression of type I IFNs as well as IFN-stimulated
genes, in response to viral infection. Our findings reveal novel dual functions
of TRIM9s in antiviral immunity, which serve to balance pro-inflammatory response
and production of type I IFNs.