Assembly mechanism of the inflammasome sensor AIM2 revealed by single molecule analysis.
Assembly mechanism of the inflammasome sensor AIM2 revealed by single molecule analysis.
复制标题
单分子分析揭示炎症小体传感器AIM2的组装机制。
DOI:
10.1038/s41467-023-43691-4
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发表时间:
2023-12-02
影响因子:
16.6
通讯作者:
de Alba, Eva
中科院分区:
文献类型:
--
作者:
Sharma, Meenakshi;de Alba, Eva
Pathogenic dsDNA prompts AIM2 assembly leading to the formation of the inflammasome, a multimeric complex that triggers the inflammatory response. The recognition of foreign dsDNA involves AIM2 self-assembly concomitant with dsDNA binding. However, we lack mechanistic and kinetic information on the formation and propagation of the assembly, which can shed light on innate immunity’s time response and specificity. Combining optical traps and confocal fluorescence microscopy, we determine here the association and dissociation rates of the AIM2-DNA complex at the single molecule level. We identify distinct mechanisms for oligomer growth via the binding of incoming AIM2 molecules to adjacent dsDNA or direct interaction with bound AIM2 assemblies, resembling primary and secondary nucleation. Through these mechanisms, the size of AIM2 oligomers can increase fourfold in seconds. Finally, our data indicate that single AIM2 molecules do not diffuse/scan along the DNA, suggesting that oligomerization depends on stochastic encounters with DNA and/or DNA-bound AIM2. Mechanistic insight into inflammasome formation is important for designing anti-inflammatory interventions. Here, the authors reveal the kinetics and distinct assembly modes of the early stages of the AIM2 inflammasome that detects pathogenic DNA.
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影响因子:
--
作者:
Diaz-Parga P;de Alba E
通讯作者:
de Alba E
DOI:
10.1016/j.jbc.2022.101566
发表时间:
2022-03
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Diaz-Parga P;de Alba E
通讯作者:
de Alba E
影响因子:
14.8
作者:
通讯作者:
--
影响因子:
30.5
作者:
Buerckstuemmer, Tilmann;Baumann, Christoph;Superti-Furga, Giulio
通讯作者:
Superti-Furga, Giulio
影响因子:
3.7
作者:
Hur, Kwang-Ho;Macdonald, Patrick J.;Mueller, Joachim D.
通讯作者:
Mueller, Joachim D.