在活细胞中使用弱亲和蛋白标记的长期单分子追踪
Claudia Catapano1, Marina S Dietz1, Julian Kompa2
1Institute of Physical and Theoretical Chemistry, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Str. 7, 60438, Frankfurt, Germany.
Angewandte Chemie (International ed. in English)
|November 15, 2024
概括
这项研究引入可交换的HaloTag连接体 (xHTLs) 用于活细胞单粒子追踪 (SPT),克服光漂白的局限性. 这种方法可以延长观察时间,揭示单个活细胞中详细的蛋白质动力学和激活模式.
科学领域:
- 细胞动态 细胞动态
- 生物物理学的生物物理.
- 分子成像学分子成像学
背景情况:
- 单颗粒追踪 (SPT) 对于观察细胞蛋白质动态至关重要.
- 在SPT中永久标记受到光漂白的限制,阻碍了长期研究.
- 开发新的标签策略对于扩展活细胞成像是必不可少的.
研究的目的:
- 引入可交换的HaloTag联结体 (xHTLs) 作为活细胞SPT的新型标记方法.
- 为了克服光漂白的局限性,并使得观测时间延长.
- 在活细胞中研究膜蛋白的动力学和激活,例如表皮生长因子受体 (EGFR).
主要方法:
- 利用可交换的HaloTag联结体 (xHTLs) 在活细胞中标记蛋白质.
- 进行单颗粒追踪 (SPT) 来监测长时间 (长达30分钟) 的蛋白质流动性.
- 应用了xHTL/HaloTag7系统来研究EGFR激活动力学和ER光蛋白扩散.
主要成果:
- 实现了长达30分钟的观测时间,显著减少了光漂白效应.
- 生成了EGFR扩散的空间地图,揭示了不均的移动性和局部的激活"热点".
- 测量了与内质网膜 (ER) 纳米结构相关的ER-光蛋白扩散系数.
结论:
- 可交换的HaloTag连接体 (xHTLs) 提供了一个强大而可通用的策略,用于扩展活细胞SPT.
- 这种方法有助于研究单个活细胞中的蛋白质动态和功能背景.
- 该方法允许详细研究膜蛋白激活和细胞内运输机制.
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