结晶切割增强超高分辨率显微镜用于跨细胞和组织的单蛋白成像
Johannes Stein1,2, Maria Ericsson3, Michel Nofal1
1Wyss Institute of Biologically Inspired Engineering, Boston, MA, USA.
bioRxiv : the preprint server for biology
|February 19, 2024
概括
我们开发了断层图像和动态增强的DNA-PAINT (tkPAINT),用于精确的单蛋白成像和分子计数. 这种方法提高了细胞完整性,并使各种样本,包括细胞核内部,能够进行强大的纳米尺度成像.
科学领域:
- 生物物理学的生物物理.
- 分子生物学分子生物学
- 显微镜的使用方法
背景情况:
- DNA-PAINT为纳米尺度成像提供了高复杂化和分子计数能力.
- 目标可访问性和可变成像性能方面的挑战限制了DNA-PAINT的广泛应用.
- 强大的单蛋白成像和精确的分子计数需要优化方法.
研究的目的:
- 为了提高DNA-PAINT可靠的单蛋白成像和分子计数.
- 改善多种生物样本的目标可访问性和成像性能.
- 开发一种用于探索生物分子组织和相互作用的多功能工具.
主要方法:
- 整体内部反射光 (TIRF) 显微镜与物理切割的整合,特别是东木山冷切割.
- 开发一个以图形和动态增强的DNA-PAINT (tkPAINT).
- 在冷切割和成像过程中优化图像结合和细胞完整性.
主要成果:
- 在各种样本类型中实现了3nm的定位精度.
- 证明了增强的图像结合和改善细胞完整性.
- 在HeLa细胞和小鼠组织的核中成功量化了局部RNA聚合酶II的丰富性.
- 展示了多重复合,多式向 (蛋白质和核酸) 和3D成像能力.
结论:
- tkPAINT显著增强了DNA-PAINT对于强大的单蛋白成像和分子计数的实用性.
- 该方法克服了目标可访问性和成像性能方面的局限性.
- tkPAINT是一种多功能工具,用于研究细胞和组织中的生物分子组织和相互作用.
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