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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.3K
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...
3.3K

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相关实验视频

Updated: Jul 6, 2025

Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon
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在倾斜的冷EM数据收集过程中克服分辨率减弱.

Sriram Aiyer1, Philip R Baldwin1,2, Shi Min Tan3

  • 1Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA, 92037, USA.

Nature communications
|January 9, 2024
PubMed
概括

电子显微镜 (cryo-EM) 研究人员现在可以通过阶段倾斜来克服首选样本定向问题. 新的工作流程将分辨率损失最小化,使高分辨率结构确定和分析新型分子相互作用成为可能.

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Strategies for Optimization of Cryogenic Electron Tomography Data Acquisition
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Routine Collection of High-Resolution cryo-EM Datasets Using 200 KV Transmission Electron Microscope
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相关实验视频

Last Updated: Jul 6, 2025

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Single-Particle Cryo-EM Data Collection with Stage Tilt using Leginon

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科学领域:

  • 结构生物学 结构生物学
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 在冷电子显微镜 (cryo-EM) 中首选的样本定向通过导致异型地图分辨率来阻碍高分辨率结构的确定.
  • 标本阶段倾斜是一个已知的解决方案,但往往导致显著的分辨率损失.

研究的目的:

  • 开发和验证最新的冷电磁数据收集和图像处理工作流程,以减轻由阶段倾斜引起的分辨率减弱.
  • 为了实现高分辨率的样本重建与首选的方向.

主要方法:

  • 实施先进的数据收集策略,涉及样本阶段倾斜至60度.
  • 开发精细的图像处理工作流程,以纠正倾斜诱导的偏差.
  • 这些方法应用于多个生物标本,包括细菌RNA聚合酶.

主要成果:

  • 发现分辨率减弱在各种倾斜角度上是可以忽略不计的或显著减少.
  • 与没有舞台倾斜生成的重建几乎无法区分.
  • 获得了3 Ångström分辨率的细菌RNA聚合酶的首选方向,揭示了新的基对识别.

结论:

  • 开发的策略有效地克服了冷EM中首选的定向挑战,而不会影响分辨率.
  • 阶段倾斜是一种强大的技术,用于获得同位素地图并改善冷-EM结构的确定.
  • 提供了一个定量框架,以指导在数据采集过程中选择最佳倾斜角度.