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Cryo-electron Microscopy

Cryo-electron Microscopy

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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Updated: Jun 30, 2025

Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block

Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block

Published on: April 8, 2021

理论框架和实验解决方案的空气-水接口吸附问题在冷EM.

Joon S Kang^1,2, Xueting Zhou¹, Yun-Tao Liu^1,3

¹Department of Microbiology, Immunology & Molecular Genetics, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, USA.

Biophysics reports

|March 22, 2024

概括

冷电子显微镜 (cryoEM) 在空气-水界面上与粒子损失作斗争. 表面活性剂降低表面张力,最大限度地减少颗粒损失,并使高分辨率的冷EM结构确定成为可能.

关键词:

空气-水接口吸附吸附.化EMEM 在冷EMEM.化ETET的使用情况.样品的准备样品的准备表面能量是表面的能量.表面活性剂是一种表面活性剂.

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Author Spotlight: Enhancing CryoEM Resolution Using Graphene-Coated Grids

Author Spotlight: Enhancing CryoEM Resolution Using Graphene-Coated Grids

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Optimizing Sample Preparation for Cryogenic Electron Microscopy

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

相关实验视频

Last Updated: Jun 30, 2025

Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block

Preparation of Sample Support Films in Transmission Electron Microscopy using a Support Floatation Block

Published on: April 8, 2021

Author Spotlight: Enhancing CryoEM Resolution Using Graphene-Coated Grids

Author Spotlight: Enhancing CryoEM Resolution Using Graphene-Coated Grids

Published on: September 8, 2023

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Optimizing Sample Preparation for Cryogenic Electron Microscopy

Published on: April 11, 2025

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:

电子显微镜 (cryoEM) 是一种强大的技术,用于确定生物复杂的原子结构.
许多复合体在冷EM网格上表现出有问题的行为,例如优先定向或聚合,阻碍结构确定.
这些问题的根本原因,特别是粒子损失,还不太清楚.

研究的目的:

开发一个理论解释的微粒在冷EM的不当行为.
建议和验证表面活性剂的使用,作为改善冷EM电网制备的解决方案.
为了证明这种方法在确定具有挑战性的生物复杂的高分辨率结构的实用性.

主要方法:

解释空气-水界面 (AWI) 的粒子行为的理论表述.
低温电子断层扫描 (cryoET) 用于可视化在冷EM网格上的粒子分布.
单粒子冷EM用于评估表面活性剂处理后的结构完整性.
适用于GroEL和ClC-1通道膜蛋白.

主要成果:

粒子优先迁移到AWI以最大限度地减少表面能量.
用表面活性剂降低表面张力显著降低了AWI的颗粒积累.
合适的表面活性剂不会损害生物复合物的结构完整性.
使用这种方法确定了ClC-1通道的近原子结构.

结论:

粒子迁移到AWI是冷EM电网准备挑战的关键因素.
表面活性剂提供了一个实用的,可通用的解决方案,以减轻冷EM中的AWI吸附问题.
这种方法有助于高分辨率的结构确定困难的生物样本,包括膜蛋白.