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相关概念视频

Electron Microscope Tomography and Single-particle Reconstruction01:07

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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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Cryo-electron Microscopy01:28

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Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
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相关实验视频

Updated: Sep 10, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon
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在纳米粒子辅助冷电子显微镜采样中利用异位导向

Yeeun Kim1, Changin Kim2, Yongsoo Yang3

  • 1Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

Methods (San Diego, Calif.)
|August 23, 2025
PubMed
概括

单倾角纳米粒子辅助冷EM采样 (ST-NACS) 有效地测量蛋白质构造变化. 该方法使用金纳米粒子 (AuNP) 对角度确定粒子间距离分布 (P(d),简化结构分析.

关键词:
不同向角分布低温电子显微镜金纳米粒子标签蛋白质异质构成倾斜系列分析

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相关实验视频

Last Updated: Sep 10, 2025

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科学领域:

  • 结构生物学
  • 生物物理
  • 低温电子显微镜

背景情况:

  • 了解小蛋白质结构动力学对于阐明生物功能至关重要.
  • 纳米粒子辅助冷电子显微镜采样 (MT-NACS) 使用多个倾斜角度通过粒子间距离测量蛋白质构成分布.
  • 由于粒子跟踪要求,目前的MT-NACS方法耗时.

研究的目的:

  • 开发一种更有效的测量蛋白质结构分布的方法.
  • 确定蛋白质结构转换是否可靠地使用单倾角冷EM数据进行评估.
  • 为了简化冷EM数据的分析.

主要方法:

  • 将金纳米粒子 (AuNP) 对角分布纳入数据分析.
  • 使用冷电子显微镜 (cryo-EM) 在单一倾斜角度收集的图像.
  • 将开发的单倾角NACS (ST-NACS) 方法应用于calmodulin (CaM).

主要成果:

  • 使用单倾角冷电磁数据可靠地确定三维粒子间距离分布 (P(d)).
  • 在ST-NACS和多倾角NACS (MT-NACS) 之间一致测量calmodulin结构变化.
  • 通过观察类似的P(d) 趋势,证明ST-NACS准确地反映了形状变化.

结论:

  • 单倾角NACS (ST-NACS) 为测量蛋白质构造分布提供了一种高效可靠的工具.
  • 该方法简化了结构分析,减少了冷EM研究所需的时间和精力.
  • ST-NACS有效监测小蛋白质中的结构转变.