Oligomerization-primed coiled-coil domain interaction with Ubc13 confers processivity to TRAF6 ubiquitin ligase activity.

Oligomerization-primed coiled-coil domain interaction with Ubc13 confers processivity to TRAF6 ubiquitin ligase activity.
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寡聚化引发的卷曲螺旋结构域与 Ubc13 的相互作用赋予 TRAF6 泛素连接酶活性的持续合成能力

DOI:
10.1038/s41467-017-01290-0
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发表时间:
2017-10-09
影响因子:
16.6
通讯作者:
Xia Z
Xia Z
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hu L;Xu J;Xie X;Zhou Y;Tao P;Li H;Han X;Wang C;Liu J;Xu P;Neculai D;Xia Z

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泛素连接酶TRAF6与泛素偶联酶Ubc13/Uev1在IL-1R/TLR通路中催化非锚定k63连接的多泛素链的过程组装,从而激活TAK1。然而,什么结构域以及它是如何使TRAF6的处理能力发挥作用的,在很大程度上是未知的。在这里,我们发现TRAF6卷曲线圈(CC)结构域对其加工能力至关重要。CC结构域介导TRAF6寡聚化,以确保高效的长多泛素链组装。CC结构域的突变或删除会损害TRAF6寡聚化和进程多泛素链组装。CC结构域与E3泛素连接酶CHIP/STUB1的融合使后者能够激活NF-κB。此外,CC结构域在低聚化后与Ubc13/Ub~Ubc13相互作用,进一步促进了TRAF6的加工性。CC域中的点突变削弱了TRAF6与Ubc13/Ub~Ubc13的相互作用,降低了TRAF6的加工性。我们的研究结果表明,CC寡聚化启动了与Ubc13/Ub~Ubc13的相互作用,从而赋予了TRAF6泛素连接酶活性的加成性。
Ubiquitin ligase TRAF6, together with ubiquitin-conjugating enzyme Ubc13/Uev1, catalyzes processive assembly of unanchored K63-linked polyubiquitin chains for TAK1 activation in the IL-1R/TLR pathways. However, what domain and how it functions to enable TRAF6’s processivity are largely uncharacterized. Here, we find TRAF6 coiled-coil (CC) domain is crucial to enable its processivity. The CC domain mediates TRAF6 oligomerization to ensure efficient long polyubiquitin chain assembly. Mutating or deleting the CC domain impairs TRAF6 oligomerization and processive polyubiquitin chain assembly. Fusion of the CC domain to the E3 ubiquitin ligase CHIP/STUB1 renders the latter capable of NF-κB activation. Moreover, the CC domain, after oligomerization, interacts with Ubc13/Ub~Ubc13, which further contributes to TRAF6 processivity. Point mutations within the CC domain that weaken TRAF6 interaction with Ubc13/Ub~Ubc13 diminish TRAF6 processivity. Our results reveal that the CC oligomerization primes its interaction with Ubc13/Ub~Ubc13 to confer processivity to TRAF6 ubiquitin ligase activity.
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