Functionally distinct effects of the C-terminal regions of IKKε and TBK1 on type I IFN production.

Functionally distinct effects of the C-terminal regions of IKKε and TBK1 on type I IFN production.
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DOI:
10.1371/journal.pone.0094999
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Kubota T
Kubota T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Nakatsu Y;Matsuoka M;Chang TH;Otsuki N;Noda M;Kimura H;Sakai K;Kato H;Takeda M;Kubota T

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κB激酶ε抑制剂(IKKε)和TANK结合激酶1(TBK 1),即所谓的非经典IKK或IKK相关激酶,通过诱导I型IFN参与细胞天然免疫。在I型IFN产生途径中,两种激酶通常磷酸化转录因子IRF 3和IRF 7。与TBK 1相反,IKKε激活的潜在机制和下游分子激活所需的区域知之甚少。在本研究中,我们专门针对IKKε的C-末端区域,研究了I型IFN启动子激活所需的区域。为了显示IKKε C-末端区域对I型IFN产生的功能意义,我们采用了IKKε的各种突变形式,并与TBK 1的相应区域进行了比较。我们确定了IKKε参与下游信号激活的特定区域和残基。有趣的是,相应的区域和残基不需要通过TBK 1激活下游信号传导。结果强调了C末端区域在先天免疫反应中IKKε功能活性中的重要性,以及IKKε与密切相关的TBK 1之间激活机制的差异。
Inhibitor of κB kinase ε (IKKε) and TANK binding kinase 1 (TBK1), so-called non-canonical IKKs or IKK-related kinases, are involved in the cellular innate immunity by inducing type I IFNs. Two kinases commonly phosphorylate transcription factors IRF3 and IRF7 in type I IFN production pathway. In contrast to TBK1, underlying mechanisms of IKKε activation and regions required for activation of downstream molecules are poorly understood. In this study, we investigated regions of IKKε required for the activation of type I IFN promoter specially, by focusing on the C-terminal region. To show the functional significance of the IKKε C-terminal region on type I IFN production, we employed various mutant forms of IKKε and compared to corresponding region of TBK1. We identified the specific regions and residues of IKKε involved in the activation of downstream signaling. Interestingly, corresponding region and residues are not required for activation of downstream signaling by TBK1. The results highlight the importance of the C-terminal region in the functional activity of IKKε in innate immune response and also the difference in activation mechanisms between IKKε and the closely related TBK1.
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