G3BP1 promotes DNA binding and activation of cGAS.

G3BP1 promotes DNA binding and activation of cGAS.
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G3BP1 促进 DNA 结合和 cGAS 激活

DOI:
10.1038/s41590-018-0262-4
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发表时间:
2019-01
期刊:
影响因子:
30.5
通讯作者:
Li T
Li T
中科院分区:
医学1区
文献类型:
--
作者:
Liu ZS;Cai H;Xue W;Wang M;Xia T;Li WJ;Xing JQ;Zhao M;Huang YJ;Chen S;Wu SM;Wang X;Liu X;Pang X;Zhang ZY;Li T;Dai J;Dong F;Xia Q;Li AL;Zhou T;Liu ZG;Zhang XM;Li T

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环GMP-AMP合成酶(CGAS)是检测胞质DNA的关键传感器。在此,我们报道了GTPase激活蛋白SH3结构域结合蛋白1(G3BP1)对DNA传感和cGAS的有效激活至关重要。G3BP1通过促进cGAS大分子复合体的形成,增强cGAS与DNA的结合。G3BP1缺乏导致cGAS与DNA结合效率低下,并抑制cGAS依赖的干扰素(IFN)的产生。G3BP1抑制剂表没食子儿茶素半乳糖(EGCG)破坏现有的G3BP1-cGAS复合体,抑制DNA触发的cGAS激活,从而阻断DNA诱导的体内和体外干扰素的产生。在艾卡迪-古蒂埃综合征(AGS)小鼠模型中,EGCG可钝化自身DNA诱导的自体炎症反应,并减少干扰素刺激的AGS患者细胞中的基因表达。因此,我们的研究表明,G3BP1在物理上与cGAs相互作用,并启动cGAs以实现有效的激活。此外,EGCG介导的G3BP1抑制为cGAS相关自身免疫性疾病提供了一种潜在的治疗方法。
Cyclic GMP-AMP synthase (cGAS) is a key sensor responsible for cytosolic DNA detection. Here we report that GTPase-activating protein SH3 domain–binding protein 1 (G3BP1) is critical for DNA sensing and efficient activation of cGAS. G3BP1 enhanced DNA binding of cGAS by promoting the formation of large cGAS complexes. G3BP1 deficiency led to inefficient DNA binding by cGAS and inhibited cGAS-dependent interferon (IFN) production. The G3BP1 inhibitor epigallocatechin gal-late (EGCG) disrupted existing G3BP1–cGAS complexes and inhibited DNA-triggered cGAS activation, thereby blocking DNA-induced IFN production both in vivo and in vitro. EGCG administration blunted self DNA–induced autoinflammatory responses in an Aicardi–Goutières syndrome (AGS) mouse model and reduced IFN-stimulated gene expression in cells from a patient with AGS. Thus, our study reveals that G3BP1 physically interacts with and primes cGAS for efficient activation. Furthermore, EGCG-mediated inhibition of G3BP1 provides a potential treatment for cGAS-related autoimmune diseases.
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