一个受体-通道三重体进行Ca2+信号,用于花粉管接收花粉
Qifei Gao1, Chao Wang1, Yasheng Xi1
1Department of Plant and Microbial Biology, University of California at Berkeley, Berkeley, CA, USA.
Nature
|July 6, 2022
概括
研究人员发现花粉衍生的酸激发受精. 这些激活卵子细胞中的受体复合体 (FER-LRE-NTA),启动植物繁殖所必需的信号.
科学领域:
- 植物生殖生物学 植物生殖生物学
- 分子细胞生物学分子细胞生物学
- 生物化学 生物化学
背景情况:
- 开花植物的受精依赖于花粉管和卵子协同细胞之间的精确通信.
- 花粉管与卵子接触会诱导在协同物中升,导致花粉管破裂和精子释放.
- 参与这个过程的关键蛋白质包括FERONIA (FER),LORELEI (LRE) 和NORTIA (NTA),但它们的相互作用机制尚不清楚.
研究的目的:
- 为了阐明在受精过程中协同-花粉管通信的分子机制.
- 为了识别介导花粉管和协同细胞之间的相互作用的连接体.
- 了解FER-LRE-NTA蛋白复合体在启动花粉管接收信号传递中的功能.
主要方法:
- 鉴定属于快速化因子 (RALF) 家族的花粉管衍生小.
- 信号通路的生物化学复合,涉及FER,LRE和NTA.
- 描述NTA作为一种卡尔莫杜林导入的通道.
主要成果:
- 两种来自花粉管的RALF被确定为FER-LRE共受体的配体.
- FER-LRE复合体将NTA招募到血膜中,在那里NTA充当通道.
- 通过RALF激活FER-LRE-NTA复合体,可以在协同剂中启动峰,这是花粉管接收的关键步骤.
结论:
- 这三种FER-LRE-NTA蛋白质组合在雌性性体内形成了一个新的受体通道复合体.
- 这个复合体识别男性衍生的信号 (RALFs) 来触发尖峰并启动受精.
- 这项研究揭示了一种以前未知的生物化学途径,该途径对于植物繁殖至关重要.
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