蛋白质与近端-远端不对称性在轴突的定位控制鞭毛节拍频率
Cecile Fort1,2, Benjamin J Walker3,4, Lore Baert1,5
1Medawar Building for Pathogen Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK.
Nature communications
|April 4, 2025
概括
在鞭毛中不对称的蛋白质定位对寄生虫运动至关重要. 这项研究确定了保护的蛋白质,这些蛋白质有助于在trypanosomatid寄生虫中的鞭毛波形频率.
科学领域:
- 细胞生物学 细胞生物学
- 寄生虫学的寄生虫学
- 生物化学 生化学
背景情况:
- 移动鞭毛体中的9+2微管子轴通常是对称的.
- 不对称的蛋白质定位在轴膜内,特别是涉及dynein臂,已知在各种生物体.
- 在单鞭状试虫寄生虫中观察到鞭状结构的近端-远端不对称性.
研究的目的:
- 为了全面地分析trypanosomatid寄生虫的 flagellar axoneme中保存的近端-远端不对称性.
- 根据Trypanosoma brucei的数据,识别在墨西哥虫中具有不对称局部化的保存蛋白质.
- 确定这些蛋白质对细胞运动,鞭毛节拍参数和轴突超结构的功能必要性.
主要方法:
- 在Trypanosoma brucei.中全基因组定位屏幕.
- 使用删除突变物识别墨西哥虫的保存蛋白质.
- 结合性内源光标记和删除分析以映射蛋白质组合的相互依赖性.
- 对鞭毛节拍参数和轴超结构的分析.
主要成果:
- 确定了15种保存的蛋白质 (9种已知,6种新发现) 具有近端或远端轴突特定的定位.
- 大多数已识别的蛋白质都与外侧的dynein臂相关,揭示了多个类的近接-远距离不对称性.
- 证明了这些蛋白质中的几种蛋白质对于维持鞭毛波形的正常频率至关重要.
- 在调节远程发起的波形时揭示了近端轴组件的意想不到的作用.
结论:
- 在trypanosomatid鞭毛中保存的近端-远端蛋白质不对称性对于运动性至关重要.
- 外部dynein臂相关的蛋白质在建立和维持鞭毛波形频率方面发挥着关键作用.
- 新的近接轴组件对鞭毛功能有显著的贡献,挑战了以前关于对称性的假设.
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