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The Ubiquitin Ligase RNF125 Targets Innate Immune Adaptor Protein TRIM14 for Ubiquitination and Degradation.

J. Immunol.2017 Jun 15;198(12):4652-4658. Epub 2017 May 05
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摘要


Tripartite motif-containing 14 (TRIM14) is a mitochondrial adaptor that facilitates innate immune signaling. Upon virus infection, the expression of TRIM14 is significantly induced, which stimulates the production of type-I IFNs and proinflammatory cytokines. As excessive immune responses lead to harmful consequences, TRIM14-mediated signaling needs to be tightly balanced. In this study, we identify really interesting new gene-type zinc finger protein 125 (RNF125) as a negative regulator of TRIM14 in the innate antiviral immune response. Overexpression of RNF125 inhibits TRIM14-mediated antiviral response, whereas knockdown of RNF125 has the opposite effect. RNF125 interacts with TRIM14 and acts as an E3 ubiquitin ligase that catalyzes TRIM14 ubiquitination. RNF125 promotes K48-linked polyubiquitination of TRIM14 and mediates its degradation via the ubiquitin-proteasome pathway. Consequently, wild-type mouse embryonic fibroblasts show significantly reduced TRIM14 protein levels in late time points of viral infection, whereas TRIM14 protein is retained in RNF125-deficient mouse embryonic fibroblasts. Collectively, our data suggest that RNF125 plays a new role in innate immune response by regulating TRIM14 ubiquitination and degradation.

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