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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

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The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate...
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相关实验视频

Updated: Sep 11, 2025

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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一个中间结构的快照.

Akira Shinohara1,2

  • 1Institute for Protein Research, The University of Osaka, Osaka, Japan.

eLife
|August 18, 2025
PubMed
概括

使用冷电子显微镜可视化了详细的DNA结构. 这项研究揭示了在同源重组中DNA链交换期间的中间"D-循环"状态.

科学领域:

  • 分子生物学分子生物学
  • 结构生物学 结构生物学
  • 遗传学 遗传学 是一个

背景情况:

  • 同源重组是DNA修复和遗传多样性的基本生物过程.
  • 了解中间状态对于阐明重组的机制至关重要.

研究的目的:

  • 为了确定D环中间体的高分辨率结构.
  • 提供对同源重组过程中DNA链交换机制的见解.

主要方法:

  • 使用冷电子显微镜 (cryo-EM) 来捕捉结构细节.
  • 使用先进的成像技术来分析DNA复合物.

主要成果:

  • 成功地解决了D环中间体的详细三维结构.
  • 确定了D环的特定结构特征,揭示了它在线程交换中的作用.

结论:

  • D-循环的确定的结构为理解同源重组提供了分子基础.
  • 这一发现提升了我们对DNA修复和遗传交换机制的知识.
关键词:
这是一个D-循环.修复DNA的修复DNA的修复在RAD51中使用RAD51.染色体是一种染色体.基因表达的基因表达方式同类的重组组合.同质性搜索搜索 搜索同质性搜索人类 人类 人类 人类 人类 人类 人类分子生物物理学分子生物物理学交换链条 交换链条 交换链条结构生物学结构生物学

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