LUBAC synthesizes linear ubiquitin chains via a thioester intermediate.

LUBAC synthesizes linear ubiquitin chains via a thioester intermediate.
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DOI:
10.1038/embor.2012.105
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发表时间:
2012-09
期刊:
影响因子:
7.7
通讯作者:
Rittinger, Katrin
Rittinger, Katrin
中科院分区:
生物学2区
文献类型:
--
作者:
Stieglitz, Benjamin;Morris-Davies, Aylin C.;Koliopoulos, Marios G.;Christodoulou, Evangelos;Rittinger, Katrin

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线性泛素链组装复合物(LUBAC)是调节免疫和炎症信号传导途径的RING E3连接酶。与经典的RING E3连接酶不同,LUBAC决定了形成的泛素链的类型,这种活性通常与E2酶相关。我们发现,环之间的环(RBR)的HOIP-LUBAC的催化亚基,包含区域是足以产生线性泛素链。然而,该活性被分子的N-末端部分抑制,该抑制在与HOIL-1 L或SHARPIN形成复合物后释放。此外,我们证明HOIP通过由RING 2结构域中的保守半胱氨酸形成的硫酯中间体将泛素转移到底物,支持RBR连接酶作为RING/HECT杂交体的观点。
The linear ubiquitin chain assembly complex (LUBAC) is a RING E3 ligase that regulates immune and inflammatory signalling pathways. Unlike classical RING E3 ligases, LUBAC determines the type of ubiquitin chain being formed, an activity normally associated with the E2 enzyme. We show that the RING-in-between-RING (RBR)-containing region of HOIP—the catalytic subunit of LUBAC—is sufficient to generate linear ubiquitin chains. However, this activity is inhibited by the N-terminal portion of the molecule, an inhibition that is released upon complex formation with HOIL-1L or SHARPIN. Furthermore, we demonstrate that HOIP transfers ubiquitin to the substrate through a thioester intermediate formed by a conserved cysteine in the RING2 domain, supporting the notion that RBR ligases act as RING/HECT hybrids.
环手指(RBR)蛋白质家族之间的环。
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线性泛素链的产生和生理作用。
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发表时间: 2012-03-15
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影响因子: 5.4
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