用于自我标签的Penta-ALFA标记基质标签允许在显微镜中增强信号
Souvik Ghosh1, Ramona Birke1, Ashwin Karthick Natarajan2
1Leibniz-Forschungsinstitut Für Molekulare Pharmakologie (FMP), Berlin, Germany.
概括
用于蛋白质成像的信号放大使用ALFA-tag系统与五价和纳米体实现. 这种方法在活细胞成像应用中增强光信号强度.
科学领域:
- 生命科学 生命科学
- 生物技术是生物技术.
- 分子成像学分子成像学
背景情况:
- 像SNAP-tag和HaloTag这样的自我标记蛋白 (SLPs) 能够对活细胞进行成像,但受到一个光素-每种蛋白质系统的限制.
- 当前SLP方法中的低信号强度限制了先进的成像应用和定量分析.
研究的目的:
- 使用ALFA标签系统为SLP开发一种新的信号放大策略.
- 通过克服单个光体标签的局限性,提高活细胞成像中的光信号强度.
主要方法:
- 合成了用于多价值标签的五价值ALFA5.
- 利用应变促进的点击化学来与SNAP或HaloTag配体结合阿齐多利辛修饰.
- 将ALFA5-Cy5基质应用于表达SNAP和HaloTag-mGluR2融合蛋白的HEK293细胞,用于共聚焦显微镜.
主要成果:
- 在试验室和细胞中,ALFA5-Cy5基质与SNAP和HaloTag融合蛋白进行了成功的标记和共价反应.
- 在纳米体添加后观察到远红色光信号强度的显著增强,由共聚焦显微镜证实.
- 与SNAP标签相比,HaloTag基板表现出更高的性能,产生更好的信号对噪声和信号对背景比率.
结论:
- 阿尔法标签系统提供了一种强大的策略,用于在自我标签蛋白质应用中放大光信号.
- 这种多价值标签方法增强了信号强度,为先进的活细胞成像提供了有价值的工具,包括超高分辨率显微镜.
- 该系统的多功能性允许在各种蛋白质系统和光体颜色中进行扩展,扩大其在生物研究中的适用性.
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