高分辨率的冷EM使用普通的LaB6120keV电子显微镜,配备了200keV以下的直接电子探测器
Hariprasad Venugopal1, Jesse Mobbs2,3, Cyntia Taveneau4
1Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Clayton, VIC, Australia.
Science advances
|January 3, 2025
概括
研究人员证明,标准的120keV传输电子显微镜 (TEM) 带有六 (LaB) 源可以使用直接电子探测器 (DED) 实现高分辨率的冷电子显微镜 (cryo-EM). 这为获得可解释的冷电磁结构提供了一个负担得起的途径.
科学领域:
- 结构生物学 结构生物学
- 显微镜技术 显微镜技术
- 生物物理学的生物物理.
背景情况:
- 高分辨率冷电子显微镜 (cryo-EM) 通常需要昂贵的200-300 keV冷传输电子显微镜 (cryo-TEMs).
- 最近在200 keV以下的直接电子探测器 (DED) 技术的进展为更实惠的冷TEM提供了潜力.
- 目前的100keV冷电磁成像依赖于场辐射枪 (FEG) 源.
研究的目的:
- 调查升级标准120 keV TEMs与高分辨率冷EM (LaB) 源的热离子兰六化物 (LaB) 的可行性.
- 为了评估200 keV以下的DED与LaB6源一起用于冷-EM结构确定的性能.
- 探索一种具有成本效益的方法,以获得可解释的冷电磁结构.
主要方法:
- 使用了一种标准的120 keV TEM,配备了一个热能LaB6源.
- 集成了一个在200 keV以下的优化直接电子探测器 (DED).
- 采用使用SerialEM与侧入式冷持有器的自动化数据收集.
主要成果:
- 实现了2.65 Å分辨率的阿波费里丁的重建.
- 获得了64kDa血红蛋白的4.33 Å分辨率重建.
- 在4.4 Å分辨率下解析了一个不对称的153 kDa膜蛋白GPCR.
结论:
- 证明了使用Lab6源的标准120keVTEM可以升级为高分辨率的冷EM.
- 展示了广泛可访问和低成本的冷EM结构确定潜力.
- 促进了冷电磁技术的民主化,使其具有更广泛的科学应用.
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