Cyclic GMP-AMP synthase is activated by double-stranded DNA-induced oligomerization.

Cyclic GMP-AMP synthase is activated by double-stranded DNA-induced oligomerization.
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环状GMP-AMP合酶通过双链DNA诱导的寡聚化激活。

DOI:
10.1016/j.immuni.2013.10.019
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发表时间:
2013-12-12
期刊:
影响因子:
32.4
通讯作者:
Li, Pingwei
Li, Pingwei
中科院分区:
医学1区
文献类型:
--
作者:
Li, Xin;Shu, Chang;Yi, Guanghui;Chaton, Catherine T.;Shelton, Catherine L.;Diao, Jiasheng;Zuo, Xiaobing;Kao, C. Cheng;Herr, Andrew B.;Li, Pingwei

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环状GMP-AMP合成酶(CGAS)是一种胞质DNA感受器,介导先天抗菌免疫。它催化合成与刺痛结合的非规范环二核苷酸2‘,5’cGAMP,并介导TBK1和IRF-3的激活。激活的irf-3转位到细胞核,启动干扰素-β基因的转录。小鼠cGAS与18bpdsDNA结合的结构表明,cGAS通过两个结合位点与dsDNA相互作用,形成2:2的复合体。CGAS突变体的酶分析和干扰素-β报告分析表明,这两个结合位点的相互作用是cGAS激活所必需的。突变和DNA结合研究表明,这两个位点协同结合dsDNA,而B位点在DNA结合中起关键作用。结合dsDNA和2‘,5’cGAMP的小鼠cGAS的结构揭示了cGAS的催化机理。这些结果表明,cGAS是通过dsDNA诱导的寡聚而被激活的。
Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor mediating innate antimicrobial immunity. It catalyzes the synthesis of a noncanonical cyclic dinucleotide 2′,5′ cGAMP that binds to STING and mediates the activation of TBK1 and IRF-3. Activated IRF-3 translocates to the nucleus and initiates the transcription of the IFN-β gene. The structure of mouse cGAS bound to an 18 bp dsDNA revealed that cGAS interacts with dsDNA through two binding sites, forming a 2:2 complex. Enzyme assays and IFN-β reporter assays of cGAS mutants demonstrated that interactions at both DNA binding sites are essential for cGAS activation. Mutagenesis and DNA binding studies showed that the two sites bind dsDNA cooperatively and site B plays a critical role in DNA binding. The structure of mouse cGAS bound to dsDNA and 2′,5′ cGAMP provided insight into the catalytic mechanism of cGAS. These results demonstrated that cGAS is activated by dsDNA-induced oligomerization.
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