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相关概念视频

Cryo-electron Microscopy01:28

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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相关实验视频

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A Microfluidic Chip for ICPMS Sample Introduction
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使用基于PDMS的微流体芯片组件制备时间解析冷EM (TRCEM) 样品.

Xiangsong Feng1, Joachim Frank1,2

  • 1Department of Biochemistry and Molecular Biophysics, Columbia University Irving Medical Center, New York, NY 10032.

bioRxiv : the preprint server for biology
|December 23, 2024
PubMed
概括

这项研究引入了一种新的时间分辨率冷电子显微镜 (TRCEM) 设置,使用微流体进行快速样品制备. 这种方法在几毫秒内提供了对生物分子反应的关键结构和运动见解.

关键词:
微型/纳米制造的制造.微流体学 微流体学单颗粒冷电磁器 (Cryo-EM) 是一种时间解决的冷EM样本准备时间解决的冷EM样本准备.

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科学领域:

  • 结构生物学 结构生物学
  • 生物化学 生物化学
  • 冷电子显微镜的使用方法

背景情况:

  • 传统的冷电子显微镜 (cryo-EM) 方法在捕捉生物分子反应的短暂状态方面存在局限性.
  • 现有的时间解析冷电磁场 (TRCEM) 技术在实现毫秒时间解析和有效的样本准备方面面临挑战.
  • 了解平衡前的中间体对于阐明分子机制至关重要.

研究的目的:

  • 开发和介绍一种新的TRCEM设置,以捕捉千秒时间尺度上的生物分子反应.
  • 为了克服先前的TRCEM方法中样品吸附和无效混合的局限性.
  • 为了证明开发的TRCEM方法在研究核糖体循环的应用.

主要方法:

  • 使用聚甲基素 (PDMS) 的微流体芯片组件的开发.
  • 该组件包括一个SiO2涂层的微混合器,一个玻璃毛细血管微反应器和一个用于样品沉积的微喷雾器.
  • 应用TRCEM设置来研究由高频 lysogenization X (HflX) 介导的核糖体循环的机制.

主要成果:

  • 新的TRCEM设置有效地解决了样品吸附和液体混合的问题.
  • 该方法产生了高度可重复的结果,在翻译研究中证明了这一点.
  • 对HflX介导的核糖体循环的研究提供了具有生物学意义的,可复制的结构和运动信息.

结论:

  • 本次展示的基于微流体的TRCEM设置使生物分子反应在10-1000毫秒的时间范围内进行结构和运动分析.
  • 该协议为研究各种生物系统中预平衡中间体提供了一种有前途的方法.
  • 开发的TRCEM设备有效地获得机械学研究的高质量数据.