锡克
先天免疫系统
生物
细胞生物学
内部收益率3
内体
信号转导
细胞内
免疫系统
酪氨酸激酶
免疫学
作者
Yu-Lin Yang,Li-Bo Cao,Wen-Rui He,Li Zhong,Yi Guo,Qing Yang,Hong-Bing Shu,Ming-Ming Hu
标识
DOI:10.1073/pnas.2207280119
摘要
The current view of nucleic acid–mediated innate immunity is that binding of intracellular sensors to nucleic acids is sufficient for their activation. Here, we report that endocytosis of virus or foreign DNA initiates a priming signal for the DNA sensor cyclic GMP-AMP synthase (cGAS)–mediated innate immune response. Mechanistically, viral infection or foreign DNA transfection triggers recruitment of the spleen tyrosine kinase (SYK) and cGAS to the endosomal vacuolar H + pump (V-ATPase), where SYK is activated and then phosphorylates human cGAS Y214/215 (mouse cGas Y200/201 ) to prime its activation. Upon binding to DNA, the primed cGAS initiates robust cGAMP production and mediator of IRF3 activation/stimulator of interferon genes-dependent innate immune response. Consistently, blocking the V-ATPase-SYK axis impairs DNA virus- and transfected DNA-induced cGAMP production and expression of antiviral genes. Our findings reveal that V-ATPase-SYK–mediated tyrosine phosphorylation of cGAS following endocytosis of virus or other cargos serves as a priming signal for cGAS activation and innate immune response.
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