阿拉比多普西斯NPR蛋白质对酸感知的结构基础
Wei Wang1,2, John Withers3, Heng Li1,4
1Department of Pharmacology, Howard Hughes Medical Institute, University of Washington, Seattle, WA, USA.
Nature
|August 14, 2020
概括
植物对酸 (SA) 的感知涉及NPR蛋白质. 研究人员绘制了NPR4的SA结合核心,揭示了一个独特的结构,该结构在结合时重塑,影响植物免疫力.
科学领域:
- 植物生物学
- 分子生物学
- 生物化学
背景情况:
- 酸 (SA) 是一种对病原体耐药性的关键植物激素.
- NPR蛋白是已知的SA受体,但它们的结合机制和信号协调尚不清楚.
研究的目的:
- 阐明NPR蛋白质对SA感知的结构机制.
- 了解NPR4如何与SA结合并与NPR1相互作用.
- 探索工程NPR4增强植物免疫力的潜力.
主要方法:
- 绘制Arabidopsis thaliana NPR4的SA结合核心
- 确定SA结合NPR4核心的晶体结构.
- 使用-交换质谱 (HDX-MS) 来研究蛋白质动力学.
- 分析SA诱导的NPR1-NPR4相互作用的破坏.
- NPR4表面残留物的位点定向突变.
主要成果:
- NPR4的SA结合核心采用一个埋藏SA的α-螺旋,缺乏明确的连接物进入路径.
- SA结合可能涉及NPR4的重大形状重塑.
- 尽管具有相似的结合残留物,但NPR1的SA结合活性明显低于NPR4.
- 确定了调节SA结合和NPR1相互作用的特定NPR4表面残留物.
- 一种过敏的NPR4变体增强了SA介导的免疫力,而不会影响因效应器引发的免疫力.
结论:
- 这项研究揭示了NPR4对SA感知的结构基础,突出显示了结合器结合时的形状变化.
- NPR4的独特结合机制和与NPR1的相互作用对SA信号至关重要.
- 工程NPR4提供了增强植物基本免疫力的潜在策略.
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