Liquid phase separation of NEMO induced by polyubiquitin chains activates NF-κB.

Liquid phase separation of NEMO induced by polyubiquitin chains activates NF-κB.
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DOI:
10.1016/j.molcel.2022.03.037
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发表时间:
2022-07-07
期刊:
影响因子:
16
通讯作者:
Chen, Zhijian J.
Chen, Zhijian J.
中科院分区:
生物学1区
文献类型:
--
作者:
Du, Mingjian;Ea, Chee-Kwee;Fang, Yan;Chen, Zhijian J.

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NF-κB必需调节因子(NEMO)是IκB激酶(IKK)复合物的调节亚基,其磷酸化NF-κB抑制剂IκBs。NEMO通过与多聚泛素链(polyUb)结合介导IKK激活。在这里,我们表明,Lys 63(K63)连接或线性polyUb与NEMO结合强烈诱导形成液体样液滴,其中IKK被激活。NEMO的这种液相分离是由NEMO和polyUb之间的多价相互作用驱动的。NEMO的NUB结构域和ZF结构域均介导与polyUb的结合,并促进细胞中NEMO相分离和IKK激活。此外,与人类免疫缺陷相关的NEMO突变损害了其相分离。这些结果表明,polyU B通过促进NEMO的相分离来激活IKK和NF-κB信号传导。
The NF-κB essential modulator (NEMO) is a regulatory subunit of the IκB kinase (IKK) complex that phosphorylates the NF-κB inhibitors IκBs. NEMO mediates IKK activation by binding to polyubiquitin chains (polyUb). Here we show that Lys63(K63)-linked or linear polyUb binding to NEMO robustly induced the formation of liquid-like droplets in which IKK was activated. This liquid phase separation of NEMO was driven by multivalent interactions between NEMO and polyUb. Both the NEMO-ubiquitin-binding (NUB) domain and the zinc finger (ZF) domain of NEMO mediated binding to polyUb and contributed to NEMO phase separation and IKK activation in cells. Moreover, NEMO mutations associated with human immunodeficiency impaired its phase separation. These results demonstrate that polyUb activates IKK and NF-κB signaling by promoting the phase separation of NEMO.
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