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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

3.4K
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...
3.4K
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

2.4K
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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相关实验视频

Updated: Jul 27, 2025

Author Spotlight: Optimizing Cryo-EM Analysis with CryoSieve for Enhanced Particle Selection Efficiency
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Author Spotlight: Optimizing Cryo-EM Analysis with CryoSieve for Enhanced Particle Selection Efficiency

Published on: May 10, 2024

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使用冷电磁粒子图像进行组合重权衡.

Wai Shing Tang1,2, David Silva-Sánchez1,3, Julian Giraldo-Barreto2

  • 1Center for Computational Mathematics, Flatiron Institute, New York, New York 10010, United States.

The journal of physical chemistry. B
|June 9, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的贝叶斯框架,用于分析具有结构异质性的生物分子的冷电子显微镜 (cryo-EM) 数据. 该方法改进了形状组合,使分子状态和自由能量的准确恢复成为可能.

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A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion
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A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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相关实验视频

Last Updated: Jul 27, 2025

Author Spotlight: Optimizing Cryo-EM Analysis with CryoSieve for Enhanced Particle Selection Efficiency
06:41

Author Spotlight: Optimizing Cryo-EM Analysis with CryoSieve for Enhanced Particle Selection Efficiency

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A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion
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A Robust Single-Particle Cryo-Electron Microscopy cryo-EM Processing Workflow with cryoSPARC, RELION, and Scipion

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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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科学领域:

  • 结构生物学是结构生物学.
  • 生物物理学的生物物理.
  • 计算生物学是一种计算生物学.

背景情况:

  • 电子显微镜 (cryo-EM) 是一种强大的技术,用于确定生物宏分子的高分辨率结构.
  • 现有的冷EM重建方法与样本表现出显著的形状异质性作斗争,限制了它们捕捉全方位分子状态的能力.
  • 来自异质样本的单分子数据包含了关于形状分布的有价值信息,这些信息通常会丢失.

研究的目的:

  • 开发一种计算框架,用于分析来自构造异质的生物分子样本的冷电子显微镜 (cryo-EM) 数据.
  • 为了能够从单分子冷电磁数据中准确估计集体密度和形状分布.
  • 克服当前重建工具在处理分子灵活性方面的局限性.

主要方法:

  • 根据贝叶斯的方法开发了一个集成改进框架.
  • 利用先前的形状组合的重量 (例如,从分子动力学或结构预测) 来估计组合密度.
  • 将框架应用于一个玩具模型和一个具有多重构造的蛋白质的合成冷电磁数据.

主要成果:

  • 该框架成功地从单分子数据中估计了在构造空间中的生物分子的平衡概率密度.
  • 为玩具模型演示了国家人口和自由能量的提取.
  • 使用合成冷EM数据对表现出折叠和展开形状的模拟蛋白质的方法进行了验证.

结论:

  • 开发的整体精细化框架为分析异构的冷EM数据提供了通用和有效的方法.
  • 这种方法可以恢复详细的结构景观,包括州人口和自由能量.
  • 该方法显著推进了冷EM的应用,以研究动态和灵活的生物大分子.