相关实验视频
Updated: Jun 25, 2025
08:06
Identification of Kinesin-1 Cargos Using Fluorescence Microscopy
Published on: February 14, 2016
7.9K
使用MINFLUX发现神经细胞中的kinesin动力学
Jan Otto Wirth1, Eva-Maria Schentarra1, Lukas Scheiderer1
1Department of Optical Nanoscopy, Max Planck Institute for Medical Research, 69120, Heidelberg, Germany.
Communications biology
|May 29, 2024
概括
研究人员使用MINFLUX显微镜追踪大鼠神经元中的kinesin-1运动蛋白,揭示了它们在细胞内的运动和ATP结合状态的细节. 这为活跃的细胞运输机制提供了新的见解.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
背景情况:
- 神经元生长需要通过运动蛋白通过细胞组件的活跃运输.
- 素-1是细胞内运输的关键运动蛋白,但它在神经元中的详细运动仍未得到充分研究.
- MINFLUX显微镜提供纳米/毫秒分辨率,用于跟踪分子运动.
研究的目的:
- 研究大鼠海马神经元内kinesin-1运动蛋白的子步骤和动态.
- 为了将kinesin-1的ATP结合状态与其机械步骤和头部在位旋转相关联.
- 探索kinesin-1在活跃运输过程中的微管相互作用和切换行为.
主要方法:
- 利用一种温和的固定协议来保护神经元中的微管结构和表面修改.
- 采用MINFLUX (最小信息,最大探索) 显微镜来追踪光标记的kinesin-1突变体.
- 分析了kinesin-1子步骤之间的时间间隔,以推断其功能状态.
主要成果:
- 通过分析其运动子步骤的时间,确定了kinesin-1的ATP结合状态.
- 在神经元过程中观察了与其ATP结合周期相关的kinesin-1头的旋转.
- 在其运输活动期间,有记录的kinesin-1在微管之间切换的实例.
结论:
- MINFLUX显微镜能够在体内详细观察神经元中的运动蛋白动力学.
- 这项研究提供了关于kinesin-1在其本源细胞环境中的机械循环和微管相互作用的见解.
- 这些发现凸显了MINFLUX在阐明复杂的活性细胞运输机制方面的潜力.
相关概念视频
01:39Anaphase A and B
4.0K
Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
4.0K
01:19Protein Dynamics in Living Cells
2.1K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K
01:17Studying the Cytoskeleton
6.0K
The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
6.0K
01:43The Movement of Organelles and Vesicles
4.4K
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
4.4K