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In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
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通过HOIP对线性ubiquitin链的酶特异结合的结构基础
Benjamin Stieglitz1, Rohini R Rana1, Marios G Koliopoulos1
1Division of Molecular Structure, MRC-National Institute for Medical Research, The Ridgeway, London NW7 1AA, UK.
Nature
|October 22, 2013
概括
线性ubiquitin链通过激活核因子 (NF) -κB来调节免疫力和炎症. 这是一种HOIP酶.
科学领域:
- 生物化学和分子生物学
- 细胞信号传输 细胞信号传输
- 在Ubiquitination中使用.
背景情况:
- 线性ubiquitin链是先天免疫,炎症和亡的关键调节者.
- 线性ubiquitin链组合复合体 (LUBAC) 的催化成分HOIP合成了这些链.
- 像HOIP一样,RBR E3链酶在无处不在中充当RING/HECT杂交的功能.
研究的目的:
- 阐明HOIP的催化活性和线性ubiquitin链形成的结构基础.
- 了解HOIP如何专门识别和激活用于链组装的ubiquitin.
- 确定在线性无处不在中LUBAC特异性的结构决定因素.
主要方法:
- 使用X射线晶体学来确定HOIP的催化核的结构.
- 对于apo形式和与ubiquitin复合的结构都获得了结构.
- 对泛素结合平台和泛素转移机制的分析.
主要成果:
- HOIP的催化核的晶体结构揭示了一个新的折叠,形成了一个无处不在的胺结合平台.
- 这个平台,带有指,正确地定位了核性攻击的乌比奎.
- 独特的ubiquitin转移复合物的快照显示了捐赠者和接受者ubiquitin与催化氨酸的接近.
结论:
- 确定的结构解释了HOIP的线性ubiquitin链合成机制.
- HOIP独特的泛素结合平台对于导向泛素和确保特异性至关重要.
- 这些结构性见解对于理解NF-κB通路激活和LUBAC功能至关重要.
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