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论文摘要：	Interferon regulatory factor 3 (IRF3) is the key transcription factor in the type I IFN signaling pathway, whose activation is regulated by multiple posttranslational modifica-tions. Here, we identify SMYD3, a lysine methyltransferase, as a negative regulator of IRF3. SMYD3 interacts with IRF3 and catalyzes the dimethylation of IRF3 at lysine 39. This modification reduces IRF3 phosphorylation, dimerization, and subsequent nuclear translocation, leading to the inhibition of downstream type I interferon production. In addition, Smyd3- deficient mice are more resistant to RNA and DNA viral infections. Zebrafish lacking smyd3 or treated with the inhibitor BCI121 are also more resistant to viral infection. Our findings reveal a role for SMYD3 in the regulation of antiviral innate immunity and provide insight into a specific modulation of IRF3 that affects its activation.

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