N端降解激活了NLRP1B炎症体
Ashley J Chui1, Marian C Okondo2, Sahana D Rao1
1Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
概括
炭致命因子和DPP8/9抑制剂通过N端降解激活NLRP1B炎症体. 这一过程释放了C终端,触发了热,这是一个关键的先天免疫反应.
科学领域:
- 免疫学
- 分子生物学
- 细胞生物学
背景情况:
- 如NLRP1B等炎症酶对先天免疫至关重要,在对病原体和危险信号的响应中激活炎症性卡斯帕斯和热.
- 炭病致死因和DPP8/9抑制剂激活NLRP1B炎症体的精确分子机制在很大程度上是未知的.
研究的目的:
- 通过炭致命因子和DPP8/9抑制剂阐明NLRP1B炎症酶激活的分子机制.
- 通过全基因组选来确定NLRP1B介导的热的宿主因素.
主要方法:
- 用全基因组的CRISPR- Cas9淘汰查来识别NLRP1B炎症酶激活的关键基因.
- 用生物化学测定来研究NLRP1B的直接裂变和随后的降解途径.
主要成果:
- 炭致命因子通过N端规则蛋白质体降解途径诱导热,直接切割NLRP1B.
- 致命因子介导的裂变导致NLRP1B的N终端降解,释放C终端以激活caspase-1.
- DPP8/9 抑制剂也诱导NLRP1B N终端的蛋白质体降解,但通过不涉及N端规则的独特途径.
结论:
- 通过不同刺激激活NLRP1B的N端降解是一种常见的机制,包括炭致命因子和DPP8/9抑制剂.
- 这项研究揭示了NLRP1B先天性免疫传感器的保护激活策略,突出显示了蛋白质体降解在炎症体调节中的作用.
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