ZDHHC11 Positively Regulates NF-κB Activation by Enhancing TRAF6 Oligomerization.

ZDHHC11 Positively Regulates NF-κB Activation by Enhancing TRAF6 Oligomerization.
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DOI:
10.3389/fcell.2021.710967
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发表时间:
2021
影响因子:
5.5
通讯作者:
Sun Q
Sun Q
中科院分区:
生物学2区
文献类型:
--
作者:
Liu E;Sun J;Yang J;Li L;Yang Q;Zeng J;Zhang J;Chen D;Sun Q

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肿瘤坏死因子受体相关因子6(TRAF6)是一种含环指结构域的泛素连接酶,通过调控TAK1和IKK复合物的激活,在核因子-κB(NF-κB)信号通路中发挥重要作用。然而,调控TRAF6 E3活性的分子机制仍不明确。在此,我们发现ZDHHC11(DHHC棕榈酰转移酶家族成员之一)在NF-κB信号通路中起正向调节作用。ZDHHC11过表达可激活NF-κB,而ZDHHC11缺失则会削弱由白细胞介素-1β(IL-1β)、脂多糖(LPS)及DNA病毒感染所刺激的NF-κB活性。此外,与对照小鼠相比,Zdhhc11基因敲除小鼠在接受LPS和D-半乳糖胺处理或感染单纯疱疹病毒1型(HSV-1)后,血清白细胞介素6(IL6)水平更低。从机制上讲,ZDHHC11与TRAF6相互作用,进而增强TRAF6的寡聚化,这增加了TRAF6合成K63连接的泛素化链的E3活性。综上所述,我们的研究表明,ZDHHC11通过促进TRAF6寡聚化和连接酶活性,进而激活TAK1和IKK复合物,对NF-κB信号通路起到正向调控作用。
Tumor necrosis factor receptor-associated factor 6 (TRAF6) is a RING domain ubiquitin ligase that plays an important role in nuclear factor-κB (NF-κB) signaling by regulating activation of the TAK1 and IKK complexes. However, the molecular mechanisms that regulate TRAF6 E3 activity remain unclear. Here, we found that ZDHHC11, a member of the DHHC palmitoyl transferase family, functions as a positive modulator in NF-κB signaling. ZDHHC11 overexpression activated NF-κB, whereas ZDHHC11 deficiency impaired NF-κB activity stimulated by IL-1β, LPS, and DNA virus infection. Furthermore, Zdhhc11 knockout mice had a lower level of serum IL6 upon treatment with LPS and D-galactosamine or HSV-1 infection than control mice. Mechanistically, ZDHHC11 interacted with TRAF6 and then enhanced TRAF6 oligomerization, which increased E3 activity of TRAF6 for synthesis of K63-linked ubiquitination chains. Collectively, our study indicates that ZDHHC11 positively regulates NF-κB signaling by promoting TRAF6 oligomerization and ligase activity, subsequently activating TAK1 and IKK complexes.
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