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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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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Author Spotlight: Enhancing CryoEM Sample Preparation Using Graphene Monolayer on Microscopy Grids
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用于高分辨率冷电子显微镜的双亲关系石墨烯板

Hang Cheng1,2,3,4, Liming Zheng5, Nan Liu1,2,6

  • 1Ministry of Education Key Laboratory of Protein Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|April 3, 2023
PubMed
概括

双亲关系石墨烯 (DAG) 通过防止蛋白质吸附和改善粒子方向来支持冷电子显微镜 (cryo-EM) 样品的制备. 这种新的技术可以有效地确定高分辨率的宏分子结构.

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科学领域:

  • 结构生物学
  • 生物物理
  • 材料科学

背景情况:

  • 低温电子显微镜 (cryo-EM) 能够确定高分辨率的宏分子结构.
  • 在冷EM中,样本准备的挑战包括在空气-水界面上的蛋白质吸附和偏好的颗粒方向.
  • 这些问题阻碍了高效的三维 (3D) 重建.

研究的目的:

  • 为冷EM样本制备开发一个改进的支持材料.
  • 克服与玻璃体冰中的蛋白质吸附和导向相关的挑战.
  • 提高冷电磁结构的效率和稳定性.

主要方法:

  • 探索双亲关系石墨烯 (DAG) 作为冷EM支持材料.
  • DAG 经过两种不同的亲缘关系连接物修饰,以结合标记蛋白质颗粒的特定位点.
  • 使用蛋白质样本,包括SARS-CoV-2尖端糖蛋白,对DAG与单一功能化的石墨烯进行比较.

主要成果:

  • DAG对目标大分子具有很高的结合特异性和亲和力.
  • 与单个功能化的石墨烯相比,DAG的结果是更平衡的粒子欧勒角分布.
  • 在空气-水界面上观察到蛋白质颗粒吸附的预防.

结论:

  • DAG 网格为冷EM 样品准备提供了强大且可通用的技术.
  • 这种方法可轻松有效地进行3D重建以确定结构.
  • 预计DAG方法将促进未来的冷EM研究.