Phase separation drives RNA virus-induced activation of the NLRP6 inflammasome.

Phase separation drives RNA virus-induced activation of the NLRP6 inflammasome.
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相分离驱动 RNA 病毒诱导的 NLRP6 炎症小体激活

DOI:
10.1016/j.cell.2021.09.032
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发表时间:
2021-11-11
期刊:
影响因子:
64.5
通讯作者:
Wu H
Wu H
中科院分区:
生物学1区
文献类型:
--
作者:
Shen C;Li R;Negro R;Cheng J;Vora SM;Fu TM;Wang A;He K;Andreeva L;Gao P;Tian Z;Flavell RA;Zhu S;Wu H

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NLRP6通过诱导包括炎性小体激活和干扰素产生在内的功能性结果,在宿主防御中发挥重要作用。在此我们表明,NLRP6在体外和细胞内与双链RNA(dsRNA)相互作用时会发生液 - 液相分离(LLPS),并且NLRP6的一个内在无序的多聚赖氨酸序列(K350 - 354)对于多价相互作用、相分离和炎性小体激活非常重要。Nlrp6缺陷型或Nlrp6K350 - 354A突变型小鼠在感染小鼠肝炎病毒或轮状病毒时,以及在肠道微生物群刺激的稳态下,炎性小体激活降低,这表明NLRP6的液 - 液相分离在抗微生物免疫中起作用。通过螺旋组装募集ASC使NLRP6凝聚物固化,并且ASC进一步募集并激活caspase - 1。脂磷壁酸,一种已知的NLRP6配体,也促进NLRP6的液 - 液相分离,并且DHX15,一种在NLRP6诱导的干扰素信号传导中的解旋酶,与NLRP6和dsRNA共同形成凝聚物。因此,NLRP6的液 - 液相分离是对配体刺激的一种常见反应,它根据细胞环境引导NLRP6产生不同的功能性结果。 双链RNA诱导NLRP6相分离以激活炎性小体
NLRP6 is important in host defense by inducing functional outcomes including inflammasome activation and interferon production. Here we show that NLRP6 undergoes liquid-liquid phase separation (LLPS) upon interaction with dsRNA in vitro and in cells, and that an intrinsically disordered poly-lysine sequence (K350–354) of NLRP6 is important for multivalent interactions, phase separation and inflammasome activation. Nlrp6-deficient or Nlrp6K350−354A mutant mice show reduced inflammasome activation upon mouse hepatitis virus or rotavirus infection, and in steady state stimulated by intestinal microbiota, implicating NLRP6 LLPS in anti-microbial immunity. Recruitment of ASC via helical assembly solidifies NLRP6 condensates, and ASC further recruits and activates caspase-1. Lipoteichoic acid, a known NLRP6 ligand, also promotes NLRP6 LLPS, and DHX15, a helicase in NLRP6-induced interferon signaling, co-forms condensates with NLRP6 and dsRNA. Thus, LLPS of NLRP6 is a common response to ligand stimulation, which serves to direct NLRP6 to distinct functional outcomes depending on the cellular context. dsRNA induces phase separation of NLRP6 for inflammasome activation
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