Cyclic GMP-AMP synthase is a cytosolic DNA sensor that activates the type I interferon pathway.

Cyclic GMP-AMP synthase is a cytosolic DNA sensor that activates the type I interferon pathway.
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环状GMP-AMP合酶是一种激活I型干扰素途径的胞质DNA传感器。

DOI:
10.1126/science.1232458
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发表时间:
2013-02-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Chen ZJ
Chen ZJ
中科院分区:
其他
文献类型:
--
作者:
Sun L;Wu J;Du F;Chen X;Chen ZJ

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哺乳动物细胞细胞质中存在DNA是一种危险信号,会触发宿主的免疫反应,比如I型干扰素(IFN)的产生。细胞质DNA通过产生环鸟苷酸-腺苷酸(cGAMP)来诱导干扰素,cGAMP会结合并激活衔接蛋白STING。通过生化分级分离和定量质谱分析,我们鉴定出一种cGAMP合酶(cGAS),它属于核苷酸转移酶家族。cGAS的过表达以一种依赖STING的方式激活转录因子IRF3并诱导IFNβ。通过DNA转染或DNA病毒感染,敲低cGAS会抑制IRF3的激活和IFNβ的诱导。cGAS在细胞质中与DNA结合并催化cGAMP的合成。这些结果表明,cGAS是一种细胞质DNA传感器,它通过产生第二信使cGAMP来诱导干扰素。
The presence of DNA in the cytoplasm of mammalian cells is a danger signal that triggers the host immune responses such as the production of type-I interferons (IFN). Cytosolic DNA induces IFN through the production of cyclic-GMP-AMP (cGAMP), which binds to and activates the adaptor protein STING. Through biochemical fractionation and quantitative mass spectrometry, we identified a cGAMP synthase (cGAS), which belongs to the nucleotidyltransferase family. Overexpression of cGAS activated the transcription factor IRF3 and induced IFNβ in a STING-dependent manner. Knockdown of cGAS inhibited IRF3 activation and IFNβ induction by DNA transfection or DNA virus infection. cGAS bound to DNA in the cytoplasm and catalyzed cGAMP synthesis. These results indicate that cGAS is a cytosolic DNA sensor that induces interferons by producing the second messenger cGAMP.
DOI: 10.1016/j.immuni.2011.05.016
发表时间: 2011-08-26
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