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在所有生物长度尺度上可克隆的对比度.

Kanda M Borgognoni1, Bradley F Guilliams2, Zachary J Butz2

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO, USA; National Institute of Environmental Health Sciences, USA.

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概括

研究人员开发了一个可克隆的纳米粒子 (cSeNP) 用于生物成像. 这种cSeNP在电子显微镜,光显微镜和X射线计算机断层扫描中提供了分子对比,使多层次的生物研究成为可能.

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细胞成像 细胞成像可克隆的纳米粒子标签相对照光和电子显微镜以及X射线断层扫描.电子断层扫描/显微镜在位置电子对比度.标记蛋白质的标记

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科学领域:

  • 生物物理学的生物物理.
  • 显微镜的使用方法
  • 纳米技术 纳米技术

背景情况:

  • 像绿色光蛋白 (GFP) 这样的可克隆对比剂对于光显微镜至关重要.
  • 生物电子显微镜缺乏类似的可克隆剂.
  • 现有的方法很难在所有生物长度尺度上提供对比度.

研究的目的:

  • 报告一种可克隆的新型纳米粒子 (cSeNP) 用于生物成像中的分子对比.
  • 证明cSeNP在多种成像方式中的实用性,包括电子显微镜,光显微镜和X射线计算机断层扫描.
  • 为了使从亚细胞结构到整个生物体的成像.

主要方法:

  • 开发一种与蛋白质结合的,直径约5纳米的纳米粒子 (cSeNP).
  • 编码cSeNP蛋白的DNA与编码FtsZ的DNA的融合,是一种细菌的管类型.
  • 在大肠杆菌中表达FtsZ-cSeNP融合蛋白,并通过传输电子断层扫描和光光显微镜进行后续分析.
  • 使用X射线计算机断层扫描来评估大肠杆菌中的对比度.

主要成果:

  • 由于其电子密度,cSeNPs在电子显微镜中呈现出高对比度.
  • 实验证实了cSeNP局部化与E. coli中已知的FtsZ导线位置相关.
  • 只有不到5%的cSeNP在意想不到的地方被发现.
  • X射线成像显示,与背景噪声有明显的对比.

结论:

  • 该cSeNP作为一个多功能,可克隆的成像对比剂.
  • 它促进了蛋白质在所有生物长度尺度上的定位和相关性.
  • 这对电子显微镜特别有利,弥合了与光显微镜等更大面积成像技术的差距.