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Updated: May 28, 2025

Single-Molecule FRET Imaging for Observing the Conformational Dynamics of Dynamin-Like GTPase Atlastin

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Published on: January 24, 2025

单分子FRET成像用于观察类似动态的GTPaseAtlastin的结构动态

Lijun Shi¹, Chenguang Yang², Lu Ma³

¹State Key Laboratory of Medicinal Chemical Biology, College of Life Sciences, Frontiers Science Center for Cell Responses, Nankai University.

Journal of visualized experiments : JoVE

|February 10, 2025

概括

单分子成像揭示了亚特拉斯 (ATL) 蛋白质的构造变化如何驱动内分泌网膜膜融合. 这项研究揭示了遗传性性 (HSP) 的机制.

科学领域:

生物物理学的生物物理.
细胞生物学细胞生物学
神经科学是一个神经科学.

背景情况:

亚特拉斯 (ATL) 蛋白质的三螺旋中间域 (3HB) 的旋转驱动了内分泌网膜 (ER) 膜融合.
功能障碍的ATL与遗传性性 (HSP) 相关,这是一种神经退行性疾病.
ATL的形状变化与GTP水解相关,但实时动态不太清楚.

研究的目的:

在GTP水解周期期间可视化亚特拉斯的实时形态动态.
阐明ATL介导的膜融合背后的机械机制.
建立一种用于研究机械化学蛋白质动态的方法.

主要方法:

使用单分子福斯特共振能量转移 (smFRET) 成像.
开发了三种策略来固定人类ATL1 (ATL1cyto) 的N端细胞质区域.
在微流体室中使用分子内和分子间smFRET进行精确的构造监测.

主要成果:

在实时中成功监测了个体ATL1细胞分子行为.
在各种核酸载荷状态中观察到蛋白质构造.
提供了对ATL机械化学循环的直接见解.

结论:

单分子smFRET可实时可视化GTP水解过程中的ATL构造变化.
这种技术为研究膜融合蛋白的机制提供了一个强大的方法.
这些发现有助于理解HSP和相关的神经退行性疾病的分子基础.

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