期刊
NATURE
卷 569, 期 7758, 页码 718-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41586-019-1228-x
关键词
-
资金
- National Institutes of Health (NIH)
- National Institute of General Medical Sciences
- Howard Hughes Medical Institute
- Office of Science, Office of Basic Energy Sciences
- US Department of Energy [DE-AC02-05CH11231]
- NIH [S10 RR025080, S10 OD018142, R01 AI145287]
- Cancer Prevention and Research Institute of Texas [RP150454]
- Welch Foundation [A-1931-20170325]
Nucleic acids from bacteria or viruses induce potent immune responses in infected cells(1-4). The detection of pathogen-derived nucleic acids is a central strategy by which the host senses infection and initiates protective immune responses(5,6). Cyclic GMP-AMP synthase (cGAS) is a double-stranded DNA sensor(7,8). It catalyses the synthesis of cyclic GMP-AMP (cGAMP)(9-12), which stimulates the induction of type I interferons through the STING-TBK1-IRF-3 signalling axis(13-15). STING oligomerizes after binding of cGAMP, leading to the recruitment and activation of the TBK1 kinase(8,16). The IRF-3 transcription factor is then recruited to the signalling complex and activated by TBK1(8,17-20). Phosphorylated IRF-3 translocates to the nucleus and initiates the expression of type I interferons(21). However, the precise mechanisms that govern activation of STING by cGAMP and subsequent activation of TBK1 by STING remain unclear. Here we show that a conserved PLPLRT/SD motif within the C-terminal tail of STING mediates the recruitment and activation of TBK1. Crystal structures of TBK1 bound to STING reveal that the PLPLRT/SD motif binds to the dimer interface of TBK1. Cell-based studies confirm that the direct interaction between TBK1 and STING is essential for induction of IFN beta after cGAMP stimulation. Moreover, we show that full-length STING oligomerizes after it binds cGAMP, and highlight this as an essential step in the activation of STING-mediated signalling. These findings provide a structural basis for the development of STING agonists and antagonists for the treatment of cancer and autoimmune disorders.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据