The kinase IKKα inhibits activation of the transcription factor NF-κB by phosphorylating the regulatory molecule TAX1BP1.

The kinase IKKα inhibits activation of the transcription factor NF-κB by phosphorylating the regulatory molecule TAX1BP1.
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DOI:
10.1038/ni.2066
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发表时间:
2011-07-17
期刊:
影响因子:
30.5
通讯作者:
Harhaj, Edward W.
Harhaj, Edward W.
中科院分区:
医学1区
文献类型:
--
作者:
Shembade, Noula;Pujari, Rajeshree;Harhaj, Nicole S.;Abbott, Derek W.;Harhaj, Edward W.

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为了响应促炎细胞因子的刺激,去泛素酶 A20 诱导性地与调节分子 TAX1BP1、Itch 和 RNF11 相互作用,形成 A20 泛素编辑复合物。然而,协调该复合物组装的分子信号仍然难以捉摸。在这里,我们证明 TAX1BP1 在 Ser593 和 Ser624 上被诱导磷酸化以响应促炎刺激。 TAX1BP1 磷酸化需要激酶 IKKα(而非 IKKβ),并且响应肿瘤坏死因子 (TNF) 或白细胞介素 1 (IL-1) 的刺激而直接磷酸化 TAX1BP1。 TAX1BP1 磷酸化对于 TAX1BP1、A20、Itch 和 RNF11 之间的细胞因子依赖性相互作用以及转录因子 NF-κB 信号传导的下调至关重要。因此,IKKα 通过协调 A20 泛素编辑复合物的组装来限制炎症基因激活,在 NF-κB 经典信号传导的负反馈中发挥关键作用。
In response to stimulation with proinflammatory cytokines, the deubiquitinase A20 inducibly interacts with the regulatory molecules TAX1BP1, Itch and RNF11 to form the A20 ubiquitin-editing complex. However, the molecular signal that coordinates the assembly of this complex has remained elusive. Here we demonstrate that TAX1BP1 was inducibly phosphorylated on Ser593 and Ser624 in response to proinflammatory stimuli. The kinase IKKα, but not IKKβ, was required for phosphorylation of TAX1BP1 and directly phosphorylated TAX1BP1 in response to stimulation with tumor necrosis factor (TNF) or interleukin 1 (IL-1). TAX1BP1 phosphorylation was pivotal for cytokine-dependent interactions among TAX1BP1, A20, Itch and RNF11 and downregulation of signaling by the transcription factor NF-κB. IKKα therefore serves a key role in the negative feedback of NF-κB canonical signaling by orchestrating assembly of the A20 ubiquitin-editing complex to limit inflammatory gene activation.
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