TAK1 Lys-158 but not Lys-209 is required for IL-1β-induced Lys63-linked TAK1 polyubiquitination and IKK/NF-κB activation.

TAK1 Lys-158 but not Lys-209 is required for IL-1β-induced Lys63-linked TAK1 polyubiquitination and IKK/NF-κB activation.
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DOI:
10.1016/j.cellsig.2010.11.017
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发表时间:
2011-04
影响因子:
4.8
通讯作者:
Yang J
Yang J
中科院分区:
生物学2区
文献类型:
--
作者:
Fan Y;Yu Y;Mao R;Zhang H;Yang J

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核因子 kappa B (NF-κB) 转录因子介导的转录是由大量刺激引发的一系列信号转导事件的终点。泛素化的蛋白水解和非蛋白水解功能对于 NF-κB 激活的调节至关重要。 IL-1β 诱导的 IKK/NF-κB 激活需要 TAK1 的 Lys63 连接多聚泛素化。然而,IL-1β信号传导中介导Lys63连接的TAK1多泛素化的赖氨酸位点仍然存在争议。在这里,我们报道IL-1β诱导的Lys63连接的TAK1多泛素化和TAK1介导的IKK、JNK和p38激活需要TAK1赖氨酸158而不是赖氨酸209。 TAK1 野生型和 K209R 突变体与 TAB1 的共过表达诱导 Lys63 连接的 TAK1 多泛素化和 NF-κB 激活,而 TAK1 K158R 突变体则不能这样做。此外,IL-1β 诱导 TAK1 野生型和 K209R 突变体的多泛素化,但不诱导 K158R 突变体的多聚泛素化。用野生型、K158R 突变体或 K209R 突变体 TAK1 重建 TAK1 缺陷型小鼠胚胎成纤维细胞,结果表明 IL-1β 诱导的 IKK、p38 和 JNK 激活需要 TAK1 Lys-158 而不是 Lys-209。
The nuclear factor kappa B (NF-κB) transcription factors-mediated transcription is the endpoint of a series of signal transduction events that are initiated by a vast array of stimuli. Both the proteolytic and non-proteolytic functions of ubiquitination are critically important for the regulation of NF-κB activation. Lys63-linked polyubiqutination of TAK1 is required for IL-1β-induced IKK/NF-κB activation. However, the lysine site that mediates Lys63-linked TAK1 polyubiquitination in IL-1β signaling is still controversial. Here we report that TAK1 lysine 158 but not lysine 209 is required for IL-1β-induced Lys63-linked TAK1 polyubiquitination and TAK1-mediated IKK, JNK, and p38 activation. Co-overexpression of TAK1 wild-type and K209R mutant with TAB1 induced Lys63-linked TAK1 polyubiquitination and NF-κB activation whereas TAK1 K158R mutant failed to do so. Furthermore, IL-1β induces polyubiqutination of TAK1 wild-type and K209R mutant but not K158R mutant. Reconstitution of TAK1-deficient mouse embryo fibroblast cells with wild-type, K158R mutant, or K209R mutant TAK1 reveals that TAK1 Lys-158 but not Lys-209 is required for IL-1β-induced IKK, p38 and JNK activation.
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