PKC phosphorylation of TRAF2 mediates IKKalpha/beta recruitment and K63-linked polyubiquitination.

PKC phosphorylation of TRAF2 mediates IKKalpha/beta recruitment and K63-linked polyubiquitination.
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DOI:
10.1016/j.molcel.2008.11.023
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发表时间:
2009-01-16
期刊:
影响因子:
16
通讯作者:
Dorf, Martin E.
Dorf, Martin E.
中科院分区:
生物学1区
文献类型:
--
作者:
Li, Shitao;Wang, Lingyan;Dorf, Martin E.

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肿瘤坏死因子(TNF)受体相关因子2 (TRAF2)是TNF信号传导的关键介质。先前的研究表明,TRAF2在NF-κB和AP-1通路中作为适配器起作用。然而,TRAF2传递信号的精确分子机制尚不清楚。我们之前报道过TRAF2在TNF刺激后被磷酸化,现在确定了PKC激酶负责磷酸化。磷酸化的TRAF2促进IKKα和IKKβ向TNF受体募集。磷酸化也决定了TRAF2在赖氨酸31位点的k63连锁多泛素化。TRAF2 k63连锁泛素化有助于TAB2/3的关联和下游IKK和JNK激酶的激活。综合数据显示,TRAF2的磷酸化通过将IKK复合物引导到膜上,促进TRAF2 k63连接的泛素化,以及将IKKα和IKKβ链与TAK1/TAB激酶定位,在TNF信号传导中发挥关键作用。
Tumor necrosis factor (TNF) receptor-associated factor 2 (TRAF2) is a key mediator in TNF signaling. Previous studies suggested that TRAF2 functions as an adaptor in the NF-κB and AP-1 pathways. However, the precise molecular mechanisms by which TRAF2 relays signals are unknown. We previously reported that TRAF2 is phosphorylated following TNF stimulation and now identify the PKC kinases responsible for phosphorylation. Phosphorylated TRAF2 facilitates recruitment of IKKα and IKKβ to the TNF receptor. Phosphorylation also determines K63-linked polyubiquitination of TRAF2 at lysine 31. TRAF2 K63-linked ubiquitination contributes to associations with TAB2/3 and activation of the downstream IKK and JNK kinases. The combined data reveal that phosphorylation of TRAF2 plays a critical role in TNF signaling by directing the IKK complex to the membrane, promoting TRAF2 K63-linked ubiquitination, and positioning the IKKα and IKKβ chains with the TAK1/TAB kinase.
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