相关实验视频

Updated: Jul 20, 2025

Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy

Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy

Published on: May 1, 2017

在生物分子冷电子显微镜中低冷却速率冷,以回收初始

Chunling Wu^1,2, Huigang Shi^1,2, Dongjie Zhu³

¹National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences (CAS), Beijing 100101, P.R. China.

|August 2, 2023

概括

通过调整样品冷速率来改进冷电子显微镜 (cryo-EM),可以恢复初始的高质量数据. 这提高了冷EM结构分辨率,并保留了敏感生物分子的细节.

科学领域:

结构生物学结构生物学
生物物理学的生物物理.
显微镜的使用方法

背景情况:

低温电子显微镜 (cryo-EM) 在初始样本曝光时受到光束诱导的运动的限制.
这种运动降低了早期的图像,减少了可用的数据和重建分辨率.
当前的方法往往排除或低估这些有价值的初始框架.

研究的目的:

研究如何在冷EM中保持初始的质量.
为了提高冷EM重建的分辨率和数据质量.
为了提高冷电磁结构中对辐射敏感的残留物质的保存.

主要方法:

修改样品制备的冷却速度,使用冷却速度梯度或更高的结温度.
从各种蛋白质和病毒样本中分析初始的质量.
将初始框架纳入3D重建过程中.

主要成果:

在样本准备过程中降低冷却速度恢复了初始冷EM框架的质量.
整合这些初始可以提高分辨率,相当于增加了约60%的数据.
在重建中保留了对辐射敏感残留的高质量的冷电磁密度.

结论:

优化的冷条件提高了冷EM数据的质量和分辨率.
该方法在现有的冷电磁设备上很容易实现.
这种方法显著改善了生物大分子的结构分析.

关键词:

由光束诱导的运动.冷却速度的冷却速度制冷-EM 样品准备方法样品准备方法高温结的高温结方式

更多相关视频

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

Published on: January 9, 2015

Manual Blot-and-Plunge Freezing of Biological Specimens for Single-Particle Cryogenic Electron Microscopy

Manual Blot-and-Plunge Freezing of Biological Specimens for Single-Particle Cryogenic Electron Microscopy

Published on: February 7, 2022

相关概念视频

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...