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RNF144B inhibits LPS‐induced inflammatory responses via binding TBK1
Author(s) -
Zhang Zhen,
Zhang Luoyan,
Wang Bin,
Zhu Xiaoxiao,
Zhao Lin,
Chu Chu,
Guo Qiang,
Wei Ran,
Yin Xunqiang,
Zhang Yunhong,
Li Xia
Publication year - 2019
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1002/jlb.2a0819-055r
Subject(s) - tank binding kinase 1 , dephosphorylation , irf3 , innate immune system , inflammation , phosphorylation , biology , gene knockdown , microbiology and biotechnology , stimulation , immune system , scaffold protein , immunology , cancer research , signal transduction , mapk/erk pathway , biochemistry , endocrinology , phosphatase , map kinase kinase kinase , apoptosis
Innate immune responses need to be precisely controlled to avoid prolonged inflammation and prevent unwanted damage to the host. Here, we report that RNF144B responded dynamically to LPS stimulation and negatively regulated LPS‐induced inflammation. We found that RNF144B interacted with the scaffold/dimerization domain (SDD) of TANK binding kinase 1 (TBK1) through the in between RING (IBR) domain to inhibit its phosphorylation and K63‐linked polyubiquitination, which led to TBK1 inactivation, IRF3 dephosphorylation, and IFN‐β reduction. RNF144B knockdown with siRNA increased IRF3 activation and IFN‐β production in response to LPS stimulation. Our study identifies that RNF144B interaction with TBK1 is sufficient to inactivate TBK1 and delineates a previously unrecognized role for RNF144B in innate immune responses.