自动检测和 de novo 结构建模的核酸从冷-EM地图的核酸
Tao Li1, Hong Cao1, Jiahua He1
1School of Physics and Key Laboratory of Molecular Biophysics of MOE, Huazhong University of Science and Technology, Wuhan, China.
Nature communications
|October 31, 2024
概括
一种新的深度学习方法,EM2NA,从冷电子显微镜地图准确地确定DNA/RNA结构. 这种方法显著优于现有的工具,用于新的结构确定,即使是复杂的生物分子.
科学领域:
- 结构生物学 结构生物学
- 计算生物学 计算生物学
- 生物物理学的生物物理.
背景情况:
- 低温电子显微镜 (cryo-EM) 对于确定宏分子结构至关重要.
- 精确的DNA/RNA结构建模从冷EM地图仍然是一个重大挑战,特别是在复杂的蛋白质-核酸相互作用.
研究的目的:
- 开发一种基于深度学习的方法,用于准确地从冷EM地图中确定 de novo DNA / RNA 结构.
- 解决目前在冷EM数据中的核酸结构建模方法的局限性.
主要方法:
- 开发了EM2NA,这是一种深度学习方法,用于从cryo-EM地图中确定DNA/RNA结构.
- 在50个实验图 (2.05.0 Å分辨率) 上评估了EM2NA,并将性能与最先进的方法进行了比较.
- 在来自电子显微镜数据库 (EMDB) 的263个未建模原始地图上测试了EM2NA.
主要成果:
- 在多样化的试验组中,EM2NA的平均残留覆盖率为83.15%,C4' RMSD为1.06 Å,序列回忆率为46.86%.
- 在准确性和覆盖范围方面,超越了现有的方法,如CryoREAD,ModelAngelo和phenix.map_to_model.
- 从未建模的冷EM地图中成功构建了从10到5347个核酸的DNA/RNA结构.
- 证明了快速的性能,在10分钟内建造结构<500nt.
结论:
- EM2NA提供了一个高精度和高效的解决方案,用于从冷-EM地图中重新确定DNA/RNA结构.
- 该方法对于模拟核酸结构,包括复杂的生物组件,具有广泛的适用性.
- EM2NA显著提升了使用冷EM数据进行结构分析的能力.
相关概念视频
Cryo-electron Microscopy
3.2K
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...
3.2K
Electron 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


