Protein interactions of the inflammasome adapter ASC by solution NMR.

Protein interactions of the inflammasome adapter ASC by solution NMR.
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DOI:
10.1016/bs.mie.2019.07.008
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发表时间:
2019
影响因子:
--
通讯作者:
de Alba E
de Alba E
中科院分区:
生物学4区
文献类型:
--
作者:
Diaz-Parga P;de Alba E

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ASC(含有 CARD 的凋亡相关斑点样蛋白)是一种模块化蛋白,充当炎症小体的接头,炎症小体是一种多蛋白复合物,可在存在感染或细胞损伤时触发炎症反应。 ASC 通过其两个死亡结构域 PYD 和 CARD 介导的同型相互作用来桥接炎性体成分(包含 PYD 的传感器和 procaspase 1)。这三种蛋白质的多个拷贝的自组装和寡聚化导致 procaspase 1 的激活,进而使不同的细胞因子发挥功能。深入了解 ASC 结合能力对于破译其在炎症小体形成中作用的分子机制至关重要。在本章中,我们讨论使用溶液 NMR 来识别炎性体适配器 ASC 的特定相互作用表面,并描述使用死亡域进行 NMR 滴定以获得所得复合物的表观解离常数的详细方案。提出了将 NMR 限制纳入分子对接以获得这些蛋白质组装体的模型。
ASC (apoptosis-associated speck-like protein containing a CARD) is a modular protein that functions as an adapter of the inflammasome, a multi-protein complex that triggers the inflammatory response in the presence of infection or cell damage. ASC bridges the inflammasome components (PYD-containing sensors and procaspase 1) via homotypic interactions mediated by its two death domains, PYD and CARD. The self-assembly and oligomerization of multiple copies of these three proteins result in the activation of procaspase 1, in turn rendering different cytokines functional. An in-depth understanding of ASC binding capabilities is crucial to decipher the molecular mechanisms of its role in inflammasome formation. In this chapter, we discuss the use of solution NMR to identify specific interacting surfaces of the inflammasome adapter ASC, and describe detailed protocols to perform NMR titrations with Death Domains to obtain apparent dissociation constants of the resulting complexes. The incorporation of NMR restraints in molecular docking to obtain models of these protein assemblies is presented.
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