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为了测量细菌细菌的绝对膜潜力,使用光寿命测量
Debjit Roy1, Xavier Michalet2,3, Evan W Miller4
1UCLA-DOE Institute for Genomics and Proteomics, Department of Biological Chemistry, University of California at Los Angeles, Los Angeles, CA 90095, USA.
bioRxiv : the preprint server for biology
|June 25, 2024
概括
研究人员开发了一种新的光学方法,用于精确测量细菌膜潜力. 这项技术使用VoltageFluor探针和Phasor-FLIM来量化膜潜力及其在单个细菌细胞中的变化.
科学领域:
- 细菌电生理学 细菌电生理学
- 一个单细胞分析.
- 光显微镜的光学显微镜.
背景情况:
- 细菌膜潜力 (MP) 反映了细胞状态,但精确的测量是具有挑战性的.
- 现有的光学方法缺乏在细菌中稳定状态MP的绝对量化.
- 传统的电极方法不适合小细菌细胞.
研究的目的:
- 开发一种新的,校准的光学方法,用于在细菌中绝对和精确的MP测量.
- 为了使单细胞解析量化MP及其动态变化.
- 为了研究细菌群体内的MP异质性.
主要方法:
- 通过光诱导电子转移 (PeT) 使用对MP敏感的VoltageFluor (VF) 光学传感器.
- 采用定量相位-FLIM分析用于高通量MP读出.
- 在 * Bacillus subtilis * 中使用调制梯度校准了 VF 探针响应.
主要成果:
- 实现了MP及其变化的单细胞解析分布.
- 建立了一个针对 * Bacillus subtilis * 特定的 MP 与 VF 生命周期校准.
- 估计未被扰乱的MP在-65mV (MSgg) 和-127mV (M9) 时,以及去极化MP在-14mV (MSgg) 时.
- 观察到的人口层面的MP异质性为~6-10mV.
结论:
- 开发的基于光寿命的方法在细菌中提供了精确,绝对的MP量化.
- 这种方法揭示了细菌群体内的显著MP异质性.
- 能够对细菌电生理学和生物电力产生新的见解.
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