模金纳米颗粒可以在冷电子断层扫描中实现多重标记
Hoyoung Kim1, Cathy J Spangler1, Aya Matsui1,2
1Vollum Institute, Oregon Health and Science University, Portland, OR 97239.
概括
研究人员开发了二维金纳米粒子 (AuNPs) 用于多重化冷电子断层扫描 (cryo-ET) 成像. 这项创新允许在细胞内区分多个分子标,推进纳米尺度结构研究.
科学领域:
- 结构生物学 结构生物学
- 纳米技术 纳米技术
- 生物物理学的生物物理.
背景情况:
- 低温电子断层扫描 (cryo-ET) 以纳米分辨率可视化细胞中的分子结构.
- 信任性标签,特别是黄金纳米颗粒 (AuNPs),对于冷ET至关重要.
- 与传统的单体AuNP进行多重复合是很困难的,这限制了多目标研究.
研究的目的:
- 开发功能化的二维AuNP用于冷ET中的多重标记.
- 为了使单体和二元AuNPs之间的可靠区分能够识别不同的分子标.
- 验证使用二维AuNPs用于细胞环境中的纳米级分子映射.
主要方法:
- 具有定义大小的二度AuNPs的合成 (约. 2.6纳米直径) 和间距 (大约. 1.4纳米) 的光线.
- 对抗GluN1 Fab的局部特异结合到针对N-甲基-D-酸盐受体 (NMDARs) 的二度AuNP.
- 应用一个深度学习分类器来区分单体和二元AuNP在冷图谱.
主要成果:
- 结构均的二维AuNP被SAXS和电子显微镜验证.
- 模态AuNP-Fab合物对复合NMDARs表现出强大的结合.
- 在现场冷ET证实了在脑组织突触裂中达到NMDARs的二维标签.
结论:
- 模态AuNPs为冷ET中的可辨别标签提供了一个可泛化的平台.
- 这种方法使多重标记和识别不同的分子点成为可能.
- 紧和均的二维AuNP适用于复杂的细胞环境中的纳米尺度映射.
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