O-GlcNAcylation of TAB1 modulates TAK1-mediated cytokine release.

O-GlcNAcylation of TAB1 modulates TAK1-mediated cytokine release.
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TAB1 的 O-GlcNAc 酰化调节 TAK1 介导的细胞因子释放。

DOI:
10.1038/emboj.2012.8
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发表时间:
2012-03-21
期刊:
影响因子:
11.4
通讯作者:
van Aalten, Daan M. F.
van Aalten, Daan M. F.
中科院分区:
生物学1区
文献类型:
--
作者:
Pathak, Shalini;Borodkin, Vladimir S.;Albarbarawi, Osama;Campbell, David G.;Ibrahim, Adel;van Aalten, Daan M. F.

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转化生长因子(TGF)-β-活化激酶1(TAK 1)是介导促炎细胞因子如转化生长因子-β、肿瘤坏死因子(TNF)、白细胞介素-1(IL-1)和wnt家族配体转导的信号的关键丝氨酸/苏氨酸蛋白激酶。发现TAK 1与结合伴侣TAB 1 -3复合,已经发现TAB 1 -3的磷酸化和泛素化调节TAK 1活性。在这项研究中,我们表明,TAB 1是修改与N-乙酰氨基葡萄糖(O-GlcNAc)在一个单一的网站,Ser 395。借助一种新的O-GlcNAc位点特异性抗体,我们证明TAB 1的O-GlcNAc化是由IL-1和渗透压(TAK 1信号级联的已知诱导剂)诱导的。通过将野生型或O-GlcNAc缺陷型突变体TAB 1(S395 A)重新引入Tab 1 −/−小鼠胚胎成纤维细胞,我们确定TAB 1的O-GlcNAc酰化是IL-1/渗透应激刺激后TAK 1完全激活、核因子κB下游激活以及最终产生IL-6和TNFα所必需的。这是信号蛋白上的单个O-GlcNAc位点调节关键先天免疫信号通路的第一个例子之一。
Transforming growth factor (TGF)-β-activated kinase 1 (TAK1) is a key serine/threonine protein kinase that mediates signals transduced by pro-inflammatory cytokines such as transforming growth factor-β, tumour necrosis factor (TNF), interleukin-1 (IL-1) and wnt family ligands. TAK1 is found in complex with binding partners TAB1–3, phosphorylation and ubiquitination of which has been found to regulate TAK1 activity. In this study, we show that TAB1 is modified with N-acetylglucosamine (O-GlcNAc) on a single site, Ser395. With the help of a novel O-GlcNAc site-specific antibody, we demonstrate that O-GlcNAcylation of TAB1 is induced by IL-1 and osmotic stress, known inducers of the TAK1 signalling cascade. By reintroducing wild-type or an O-GlcNAc-deficient mutant TAB1 (S395A) into Tab1−/− mouse embryonic fibroblasts, we determined that O-GlcNAcylation of TAB1 is required for full TAK1 activation upon stimulation with IL-1/osmotic stress, for downstream activation of nuclear factor κB and finally production of IL-6 and TNFα. This is one of the first examples of a single O-GlcNAc site on a signalling protein modulating a key innate immunity signalling pathway.
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