ExoSloNano:多模态纳米金标签用于识别活细胞和冷电子断层扫描中的宏分子
Lindsey N Young1, Alice Sherrard2, Huabin Zhou3
1School of Biological Sciences, University of California San Diego, La Jolla, CA, USA.
bioRxiv : the preprint server for biology
|October 17, 2024
概括
新型纳米金探头允许研究人员使用冷电子断层扫描 (cryo-ET) 检测活细胞中的特定蛋白质. 这一突破扩大了电子显微镜可以发现的蛋白质范围,即使是少量存在的蛋白质.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 生物物理学的生物物理.
- 显微镜技术 显微镜技术
背景情况:
- 在现场冷电子显微镜 (cryo-EM) 对于研究原生细胞环境中的宏分子结构具有强大作用.
- 目前的冷EM方法很难识别细胞内较小或稀少的蛋白质.
- 化EM的进步主要集中在大型复合体上,在识别更广泛的蛋白质组方面留下了一个空白.
研究的目的:
- 开发和验证使用冷电子断层扫描 (cryo-ET) 检测活细胞内的特定蛋白质的新型纳米金探针.
- 为了使以前难以捉摸的大分子在各种尺寸尺度上的识别和结构分析.
- 扩大可用于电子显微镜分析的蛋白质的范围.
主要方法:
- 引入纳米金探头进入活细胞,保持细胞完整性和分子网络.
- 使用冷电子断层扫描 (cryo-ET) 和树脂嵌入式相关光电子显微镜 (CLEM) 进行检测.
- 采用室温电子显微镜 (EM) 进行初始蛋白质识别和冷ET进行结构分辨.
- 对于潜在的多重标签策略,使用不同大小的金颗粒.
主要成果:
- 证明成功地将纳米金探头引入活细胞,而不会损害生命力或网络完整性.
- 通过纳米黄金标签系统成功识别了细胞质和核蛋白.
- 在冷-ET断层扫描中解决了具有高分子特异性的相关细胞结构.
- 验证了探测器以高效率和特异性标记蛋白质的能力.
结论:
- 引入了一种广泛启用工具,可以显著扩展电子显微镜可访问的蛋白质组.
- 纳米金探针在活细胞中提供高效的蛋白质标记,并在cryo-ET中提供分子特异性.
- 这项技术有助于研究以前无法溶解的蛋白质和分子网络.
- 该系统支持未来的多重标签,用于同时检测和结构分析多个目标.
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