基绿色光蛋白染色体:气相和水溶液中的动态
Eleanor K Ashworth1, Min-Hsien Kao1, Cate S Anstöter2
1School of Chemistry, Norwich Research Park, University of East Anglia, Norwich, NR4 7TJ, UK. james.bull@uea.ac.uk.
Physical chemistry chemical physics : PCCP
|August 31, 2023
概括
研究基化GFP染色体衍生物揭示了气相寿命比水中的更长. 化对激发状态动态产生影响,一些衍生品由于在气相中发生系统间交叉而显示更长的寿命.
科学领域:
- 光物理学的光学物理学
- 生物成像是一种生物成像.
- 频谱学是一种光谱学.
背景情况:
- 像绿色光蛋白 (GFP) 这样的光蛋白对生物成像至关重要.
- 了解生物染色体光物理和兴奋状态动态是开发新光蛋白的关键.
- 化学衍生物显著影响这些光物理性质.
研究的目的:
- 为了研究三种基化GFP染色体衍生物中S1状态的光物理性质.
- 为了比较气相与凝结相 (水) 中的兴奋状态动态.
- 阐明化位置对激发状态生命周期和动态的影响.
主要方法:
- 气相中的时间分辨率光电子成像.
- 五秒钟的光在水中的上升转换.
- 理论计算包括TD-DFT分子动力学和MS-CASPT2.
主要成果:
- 气相寿命 (1.6-10 ps) 比在水中 (0.06-3 ps) 长得多.
- 在3位和5位的化减缓了动态;在2位和6位的化显著缩短了寿命.
- 在气相中存在较小,寿命较长的兴奋状态群体 (≫ 40 ps),这归因于系统间交叉 (ISC) 到三重体状态,在凝结阶段没有这种情况.
结论:
- 凝结相环境稳定扭曲的中间体和形交叉,缩短激发状态的寿命相比气相.
- 特定的化模式 ("前扭曲") 可以大大改变兴奋状态动态和寿命.
- 由于S1/T1退化,在气相中会发生跨系统交叉到三重状态,但在凝结阶段会被抑制.
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