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通过自动处理的Caspases在Pyroptosis中准GSDMD的结构机制
Kun Wang1, Qi Sun2, Xiu Zhong1
1Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program, National Institute of Biological Sciences, 102206 Beijing, China; National Institute of Biological Sciences, Beijing, 102206 Beijing, China.
Cell
|February 29, 2020
概括
炎症酶激活的卡斯帕斯 (卡斯帕斯-1, -4, -11) 切割了Gasdermin D (GSDMD),从而引发了热. 这项研究揭示了激活的caspase-4/11如何使用独特的疏水接口来结合GSDMD,驱动热并提供新的治疗点.
科学领域:
- 分子生物学
- 免疫学
- 结构生物学
背景情况:
- 气体皮质D (GSDMD) 是热的关键执行蛋白,这是一种促炎性细胞死亡形式.
- 炎症酶激活导致GSDMD的caspase-1或caspase-11/4/5分裂,从而启动细胞溶解.
- 卡斯帕体识别GSDMD的确切机制以及这与卡斯帕体激活的关系在很大程度上是未知的.
研究的目的:
- 阐明由炎酶激活卡斯帕体识别GSDMD的分子机制.
- 调查酶介导的GSDMD裂变和热诱导的结构基础.
- 为了确定开发特定的 pyroptotic caspases 的潜在目标.
主要方法:
- 对卡斯帕斯-4/11的特定地点自动处理分析.
- -4/11-GSDMD-C和-1-GSDMD-C复合物的联合结晶和结构确定.
- 生物化学测试以评估结合性和功能性后果.
主要成果:
- 在GSDMD裂变和热中,将caspase-4/11自动加工为其p10产物是必不可少的,也是足够的.
- 自动处理的caspase-4/11通过诱导的疏水界面与GSDMD C终端域具有高亲和度的结合.
- 这种相互作用促进了酶二元化和激活,导致独立于正规四基因的GSDMD裂变.
- 结构分析显示了类似的GSDMD识别模式.
结论:
- 发现了一种涉及诱导疏水界面的新型基质识别机制.
- 这些研究结果提供了对热的调节的关键见解.
- 已发现的疏水界面为开发针对性阻断剂提供了有前途的途径.
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