Substrate-specific recognition of IKKs mediated by USP16 facilitates autoimmune inflammation.

Substrate-specific recognition of IKKs mediated by USP16 facilitates autoimmune inflammation.
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USP16 介导的 IKK 底物特异性识别促进自身免疫炎症

DOI:
10.1126/sciadv.abc4009
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发表时间:
2021-01
期刊:
影响因子:
13.6
通讯作者:
Jin J
Jin J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yu JS;Huang T;Zhang Y;Mao XT;Huang LJ;Li YN;Wu TT;Zhong JY;Cao Q;Li YY;Jin J

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泛素化调节IKKβ的选择性底物识别。经典的NF-κB通路在多种免疫反应和炎症性疾病中起着至关重要的作用。其关键激酶IKKβ通过选择性识别其下游底物(包括p105、p65和IκBα)参与多种病理和生理过程,但这些底物的具体机制尚不清楚。其中一种底物p105的过度激活与Nfkb 1缺陷小鼠炎症性肠病(IBD)的发病密切相关。在这项研究中,我们发现IKKβ在赖氨酸-238上的泛素化在炎症过程中显著增加。利用质谱分析,我们确定USP 16是IKKβ泛素化水平的重要调节因子,它选择性地影响p105磷酸化,而不直接影响p65或IκBα磷酸化。此外,USP 16在IBD患者的结肠巨噬细胞中高度表达,骨髓条件性USP 16敲除小鼠表现出IBD严重程度降低。本研究为IBD的发病机制和靶向精准干预治疗提供了新的理论依据。
Ubiquitination regulates selective substrate recognition of IKKβ. The classic NF-κB pathway plays crucial roles in various immune responses and inflammatory diseases. Its key kinase, IKKβ, participates in a variety of pathological and physiological processes by selectively recognizing its downstream substrates, including p105, p65, and IκBα, but the specific mechanisms of these substrates are unclear. Hyperactivation of one of the substrates, p105, is closely related to the onset of inflammatory bowel disease (IBD) in Nfkb1-deficient mice. In this study, we found that IKKβ ubiquitination on lysine-238 was substantially increased during inflammation. Using mass spectrometry, we identified USP16 as an essential regulator of the IKKβ ubiquitination level that selectively affected p105 phosphorylation without directly affecting p65 or IκBα phosphorylation. Furthermore, USP16 was highly expressed in colon macrophages in patients with IBD, and myeloid-conditional USP16-knockout mice exhibited reduced IBD severity. Our study provides a new theoretical basis for IBD pathogenesis and targeted precision intervention therapy.
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