用古典光和量子光激发黄素和黄蛋白
Juan P Villabona-Monsalve1, Oleg Varnavski1, Bruce A Palfey2
1Department of Chemistry , University of Michigan , Ann Arbor , Michigan 48109 , United States.
Journal of the American Chemical Society
|October 23, 2018
概括
纠的两光子吸收 (ETPA) 增强了黄蛋白的光. 这项研究表明ETPA是一种敏感的技术,用于检测光蛋白,即使是具有小经典两光子吸收截面的蛋白质.
科学领域:
- 生物物理
- 光谱学
- 生物化学
背景情况:
- 黄蛋白是含有黄染色体 (FMN,FAD) 的重要生物分子.
- 双光子吸收 (TPA) 是用于分子激发的非线性光学过程.
- 纠的光子对可以增强像TPA这样的非线性光学过程.
研究的目的:
- 研究自然存在的黄蛋白中纠的两光子吸收 (ETPA) 过程.
- 为了比较ETPA在自由脂中的效率与嵌入蛋白质环境中的脂.
- 评估ETPA作为光蛋白的传感技术的潜力.
主要方法:
- 研究了低温反应蛋白 (LOT6P) 和b型二酸脱酶 (DHOD B).
- 使用纠光子和经典光来测量ETPA截面.
- 在自由黄素染色体和蛋白质矩阵中的水溶液中比较ETPA.
主要成果:
- 与自由溶液相比,当黄素染色体嵌入蛋白质时,ETPA截面显著增加.
- ETPA的增强在纠的光子中比在经典光线中更为明显.
- 在LOT6P和DHOD B黄蛋白中观察到ETPA信号的增加.
结论:
- ETPA是研究黄蛋白的高度敏感的方法.
- 蛋白质环境增强了ETPA,特别是与纠的光子.
- ETPA作为光蛋白的传感技术具有前景,包括具有较低经典TPA的蛋白.
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