效应器AVR3a11中的Phytophthora capsici动力学证实了核心WY域折叠
James Tolchard1, Vicki S Chambers1, Laurence S Boutemy2
1School of Chemistry, Pharmacy and Pharmacology, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, U.K.
Biochemistry
|February 20, 2025
概括
来自Phytophthora capsici的Oomycete效应体AVR3a11表现出动态的形状交换,这对其在植物感染中的功能至关重要. 它的N端螺旋不太稳定,这表明灵活性有助于逃避植物防御.
科学领域:
- 植物病理学和分子生物学.
- 结构生物学和蛋白质动态学
背景情况:
- 像Phytophthora infestans和Phytophthora sojae这样的虫病原体会导致农业的重大损失.
- 包括AVR3a和AVR3a11在内的RXLR因子被转移到宿主细胞中以抑制植物免疫力.
- WY域是RXLR蛋白中常见的效应器域,被认为具有保存的核心折叠.
研究的目的:
- 为了阐明oomycete效应器AVR3a11.11的溶液结构和动态.
- 为了研究AVR3a11的结构元素的稳定性和灵活性.
- 了解AVR3a11的动态的功能影响.
主要方法:
- 用X射线结晶学进行初始结构确定.
- 核磁共振 (NMR) 放松测量用于快速时间尺度动态 (ns-ps).
- /交换实验用于缓慢的时间尺度动态 (秒到分钟).
主要成果:
- 确定了AVR3a11的溶液结构,补充了晶体结构数据.
- 与核心折叠相比,/交换显示N端螺旋的稳定性较低.
- 核磁共振放松表明AVR3a11之间存在广泛的形状交换,特别是在功能相关的区域.
结论:
- AVR3a11具有灵活的结构,具有显著的形状交换.
- 观察到的动态,特别是在N端区域,可能对效应器功能和宿主相互作用至关重要.
- 了解AVR3a11的动态,可以了解虫病原性机制.
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