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全长的GSDME调解了独立于裂变的热
Bo Zhou1, Zhi-Hong Jiang1, Meng-Ran Dai1
1State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, China.
Nature cell biology
|July 12, 2024
概括
科学家们发现了一种细胞死亡的新方法. 全长的Gasdermin E (GSDME) 蛋白质触发了 pyroptosis,没有裂变,由DNA损伤和氧化应激激活.
科学领域:
- 细胞生物学 细胞生物学
- 细胞死亡的分子机制
- 生物化学 生物化学
背景情况:
- 气体胺 (GSDM) 蛋白质执行 pyroptosis,一个被编程的细胞死亡,通常是在蛋白质酶分裂后.
- 调节GSDM家族成员激活的精确机制仍在被发现.
研究的目的:
- 为了研究一种新的,离裂独立的Gasdermin E (GSDME) 介导的热灭菌的途径.
- 为了阐明将DNA损伤与热致死执行联系起来的分子事件.
主要方法:
- 利用紫外C辐射诱导DNA损伤并触发细胞反应.
- 研究了聚合物 (PAR) 聚合物,PARP1,PARP5和活性氧物种在GSDME激活中的作用.
- 分析了全长GSDME (FL-GSDME) 的蛋白质构造变化,PARylation,氧化和等离子体膜向.
主要成果:
- 紫外线C辐射诱导的DNA损伤激活了核PARP1,产生了细胞质PAR聚合物.
- PAR聚合物激活PARP5,导致FL-GSDME PARylation并缓解自身抑制.
- 氧化应激,由细胞染色体c-催化心素过氧化促进,被PARylated FL-GSDME感知,导致寡合化和血穿孔.
结论:
- 已经确定了一种由未被切割的,全长的GSDME (FL-GSDME) 介导的新型火灭菌机制.
- 这一途径涉及PARylation和氧化应激,与传统的蛋白酶依赖的GSDME激活不同.
- 这些发现扩大了对火灭的执行和GSDME.ME的功能谱的理解.
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