Deactylation by SIRT1 enables liquid–liquid phase separation of IRF3/IRF7 in innate antiviral immunity

Deactylation by SIRT1 enables liquid–liquid phase separation of IRF3/IRF7 in innate antiviral immunity
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SIRT1 的去乙酰化可实现先天抗病毒免疫中 IRF3/IRF7 的液-液相分离

DOI:
10.1038/s41590-022-01269-0
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发表时间:
2022-07
期刊:
影响因子:
30.5
通讯作者:
Long Zhang
Long Zhang
中科院分区:
医学1区
文献类型:
--
作者:
Ziran Qin;Xiuwu Fang;Wenhuan Sun;Zhenyu Ma;Tong Dai;Shuai Wang;Zhi Zong;Huizhe Huang;Heng Ru;Huasong Lu;Bing Yang;Shixian Lin;Fangfang Zhou;Long Zhang

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先天抗病毒免疫随着年龄的增长而恶化,但这是如何发生的还不完全清楚。在这里,我们发现sirt1介导的dna结合域(DBD)去乙酰化是IRF3/7激活的关键步骤,在衰老过程中被抑制。病毒刺激的IRF3与干扰素(IFN)刺激的应答元件DNA进行液-液相分离(LLPS),并在细胞核中区隔IRF7,从而刺激I型IFN (IFN-I)的表达。SIRT1缺失导致DBD中IRF3/IRF7高乙酰化,从而抑制LLPS和先天免疫,导致小鼠病毒载量和死亡率增加。通过开发遗传密码扩展正交系统,我们证明了在特定的IRF3/IRF7 DBD位点存在乙酰基片段,从而消除IRF3/IRF7 LLPS和IFN-I诱导。SIRT1激动剂在老年小鼠中恢复SIRT1活性,恢复IFN信号,从而拮抗病毒复制。这些发现不仅确定了SIRT1通过影响IRF3/IRF7 LLPS调节IFN产生的机制,而且还提供了先天免疫衰老驱动因素的信息。
Innate antiviral immunity deteriorates with aging but how this occurs is not entirely clear. Here we identified SIRT1-mediated DNA-binding domain (DBD) deacetylation as a critical step for IRF3/7 activation that is inhibited during aging. Viral-stimulated IRF3 underwent liquid–liquid phase separation (LLPS) with interferon (IFN)-stimulated response element DNA and compartmentalized IRF7 in the nucleus, thereby stimulating type I IFN (IFN-I) expression. SIRT1 deficiency resulted in IRF3/IRF7 hyperacetylation in the DBD, which inhibited LLPS and innate immunity, resulting in increased viral load and mortality in mice. By developing a genetic code expansion orthogonal system, we demonstrated the presence of an acetyl moiety at specific IRF3/IRF7 DBD site/s abolish IRF3/IRF7 LLPS and IFN-I induction. SIRT1 agonists rescued SIRT1 activity in aged mice, restored IFN signaling and thus antagonized viral replication. These findings not only identify a mechanism by which SIRT1 regulates IFN production by affecting IRF3/IRF7 LLPS, but also provide information on the drivers of innate immunosenescence.
草鲤(ctenopharyngodon idella)KAT8通过乙酰化IRF3/IRF7抑制IFN 1响应。
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