从电子冷显微镜获得的图像中建模干
Shaileshanand Jha1, Sucharita Bose2, Kutti R Vinothkumar3
1National Centre for Biological Sciences, Tata Institute of Fundamental Research.
Journal of visualized experiments : JoVE
|August 14, 2024
概括
低温电子显微镜 (cryoEM) 揭示了蛋白质-连接体相互作用. 本研究探讨了在冷EM地图中识别和建模配体的方法,以帮助药物发现.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 药物发现 药物发现 药物发现
背景情况:
- 蛋白质-连接体相互作用对于生物过程和药物开发至关重要.
- 低温电子显微镜 (cryoEM) 提供了近原子分辨率的宏分子结构.
- 在冷EM数据中识别配体是具有挑战性的,因为地图噪声和分辨率的变化.
研究的目的:
- 引入软件和方法用于结晶EM中的连接物识别,模型构建和改进.
- 为了说明连接体检测技术,使用诸如乙醇酶和甲基增生谷氨酸受体mGlu5.5的例子.
- 分析分辨率对连接体建模的影响,并讨论冷EM在药物发现中的作用.
主要方法:
- 差异地图生成 (带有和没有连接体的地图减法).
- Fo-Fc省略了用于连接体验证的地图计算.
- 使用β-galactosidase在不同分辨率下对联体和溶剂分子建模的分析.
主要成果:
- 差异图有效地突出显示了一些目标 (例如,enolase) 的连接体存在.
- 当差异图不够时,Fo-Fc遗漏图提供了一种可靠的方法来验证连接体存在 (例如,mGlu5).
- CryoEM 地图分辨率显著影响着联结体和溶剂建模的准确性.
结论:
- 各种计算方法有助于在冷EM图中识别和建模配体.
- 在冷EM研究中,Fo-Fc遗漏图为配体验证提供了可靠的方法.
- 化EM是一种强大的工具,具有显著的潜力,可以通过对蛋白质连接体复合体的详细结构分析来加速药物发现.
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