少数最终堆在单粒子冷EM中产生更高的振幅
Jianying Zhu1, Qi Zhang2,3,4,5, Hui Zhang6
1Yau Mathematical Sciences Center, Tsinghua University, Beijing, China.
Nature communications
|December 10, 2023
概括
低温电子显微镜 (cryo-EM) 颗粒分类被 CryoSieve 优化,这是一个新的方法. CryoSieve揭示了大多数粒子是不必要的,一个小的子集产生优越的高分辨率的冷EM数据.
科学领域:
- 结构生物学是结构生物学.
- 生物物理学的生物物理.
- 生物化学 生物化学
背景情况:
- 低温电子显微镜 (cryo-EM) 确定生物大分子的近原子分辨率结构.
- 冷电磁波需要平均许多低信号-噪声图像.
- 对于特定分辨率的最小粒子数量是未知的,这阻碍了样本分析.
研究的目的:
- 开发一种优化冷EM中的粒子选择的方法.
- 为了解决实现所需分辨率的最小粒子数的问题.
- 提高对样本行为和制备方法的理解.
主要方法:
- 开发了一种代的粒子分类和选算法,名为CryoSieve.
- 实验验证和比较CryoSieve与现有的cryo-EM粒子分类算法.
主要成果:
- CryoSieve的性能优于其他粒子分类算法.
- 发现绝大多数粒子对于高分辨率重建是不必要的.
- 一个小小的粒子子集在密度图中提供了优越的高分辨率振幅.
- 最佳粒子子集的大小接近一些数据集的理论极限.
结论:
- CryoSieve有效地识别出用于高分辨率冷EM的必需颗粒.
- 优化粒子选择可以显著减少数据需求.
- 这种方法提高了冷EM数据处理的效率和理解.
相关概念视频
01:28Cryo-electron Microscopy
3.3K
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...
3.3K
01:07Electron Microscope Tomography and Single-particle Reconstruction
2.4K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
2.4K