植物助手NLR的激活和抑制机制
Yinyan Xiao1,2, Xiaoxian Wu1, Zaiqing Wang1
1State Key Laboratory of Plant Trait Design, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
Nature
|February 12, 2025
概括
植物免疫受体形成抵抗体以激活防御. 这项研究揭示了NLR辅助蛋白NRG1与EDS1和SAG101的相互作用,详细介绍了植物免疫的激活和抑制机制.
科学领域:
- 植物免疫力
- 分子植物病原体相互作用
- 结构生物学
背景情况:
- 植物核酸结合丰富的重复受体 (NLR) 对于免疫至关重要,在病原体效应体识别时形成抵抗体.
- 传感器NLR可以触发涉及EDS1,SAG101和辅助NLR,NRG1的异体合体的形成,这对于下游信号提供至关重要.
研究的目的:
- 阐明了在Arabidopsis中AtEDS1-AtSAG101-AtNRG1复合物的形成和激活的结构机制.
- 了解助手NLR,NRG1是如何激活的,以及如何抑制其信号传递.
主要方法:
- 用X射线结晶学测定AtEDS1-AtSAG101-AtNRG1A和AtEDS1-AtSAG101-AtNRG1C异构体的结构.
- 生物化学测试以调查蛋白质与蛋白质相互作用和信号激活.
主要成果:
- 这些结构显示了AtEDS1-AtSAG101-AtNRG1A和AtEDS1-AtSAG101-AtNRG1C异构体的类似组装机制.
- 通过与AtEDS1-AtSAG101异构体和小分子连接体的相互作用激活AtNRG1A信号.
- 一种截断的变体AtNRG1C通过与AtEDS1-AtSAG101的增强相互作用和核细胞质封存来超越AtNRG1A.
结论:
- 这项研究为植物辅助NLR的激活机制提供了原子层面的洞察力.
- 它揭示了截断的AtNRG1C变种如何通过隔离关键信号组件作为抑制剂,从而调节植物的免疫反应.
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