迪内因和迪纳克丁可以远程移动,但分别被送到轴突尖端
Alexander D Fellows1, Michaela Bruntraeger2, Thomas Burgold2
1Division of Structural Studies, Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
The Journal of cell biology
|February 26, 2024
概括
神经元使用dynein电机进行关键的轴突运输. 这项研究可视化了dynein及其调节器LIS1和NDEL1,揭示了它们如何沿着轴突协调长途运输.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 分子电机分子电机
背景情况:
- 轴突运输对于神经元的生存和功能至关重要.
- 迪内因电机与迪纳克丁等辅助因子以及LIS1和NDEL1调节器一起,调节逆行轴突传输.
- 之前的研究面临着在轴突内单个分子水平上可视化这些组件的挑战.
研究的目的:
- 在轴突运输过程中可视化dynein及其相关蛋白质的单分子动力学.
- 了解dynein,dynactin,LIS1和NDEL1如何在轴突的整个长度上协调它们的运动.
- 研究这些组件在逆行和逆行运输中的差异运动.
主要方法:
- 利用神经元可诱导的人类干细胞系 (NGN2-OPTi-OX) 进行内源标记的dynein组件.
- 采用近单分子成像技术,可视化轴突内的运动蛋白质动态.
- 追踪了dynein,dynactin,LIS1和NDEL1在前向和逆向方向上的运动.
主要成果:
- 迪内因和迪纳克丁证明了长距离运动 (>500微米) 沿着轴突在逆行方向.
- LIS1和NDEL1也展出了长途运输,挑战了他们以前仅限于运输启动的角色.
- 观察到dynein/LIS1和dynactin/NDEL1复合体在向方向上的不同速度,这表明它们与不同的货物有关.
结论:
- 神经元通过将dynein/dynactin复合体连接到长距离的货物来维持有效的轴突运输.
- 在必要时分离dynein/LIS1和dynactin/NDEL1复合体,从而实现协调和调节的运输.
- 这项研究为神经元运输中的分子电机的时空调节提供了新的见解.
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