一种植物NLR复合体的基ADP释放原始物
Jizong Wang1,2, Jia Wang2, Meijuan Hu1
1State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Academy of Seed Design, Chinese Academy of Sciences, 100101 Beijing, China.
概括
植物NLR免疫受体如ZAR1被病原体效应体激活. 结构研究揭示了PBL2UMP与RKS1结合如何稳定ZAR1,阻断ADP结合并启动植物防御.
科学领域:
- 植物免疫力
- 植物防御的分子机制
- 结构生物学
背景情况:
- 核酸结合 (NB),富含白素的重复 (LRR) 受体 (NLR) 对植物免疫反应至关重要.
- 克桑托莫纳斯坎普斯特里斯效应剂AvrAC将阿拉比多普西斯的PBL2激酶转化为PBL2UMP,从而激活ZAR1 NLR受体.
研究的目的:
- 确定ZAR1-RKS1和ZAR1-RKS1-PBL2UMP的冷电子显微镜结构.
- 阐明通过PBL2UMP激活ZAR1的结构基础.
主要方法:
- 冷电子显微镜 (冷电子显微镜)
- 蛋白质复合物的结构分析
主要成果:
- 确定ZAR1-RKS1 (不活跃) 和ZAR1-RKS1-PBL2UMP (中间状态) 的结构.
- 在植物中,ZAR1 LRR域采用独特的形状,将ZAR1隔离在非活性状态.
- 通过RKS1调解PBL2UMP的识别,稳定RKS1的激活段并阻止ZAR1的ADP结合.
- PBL2UMP结合诱导ZAR1 NB领域的灵活性.
结论:
- ZAR1-RKS1-PBL2UMP结构为了解工厂NLR激活提供了一个模板.
- 对ZAR1功能的结构洞察力提高了我们对植物免疫信号通路的了解.
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