Excited-state relaxation dynamics of a PYP chromophore model in solution: influence of the thioester group
作者:Pascale Changenet-Barret、Agathe Espagne、Nathalie Katsonis、Sandrine Charier、Jean-Bernard Baudin、Ludovic Jullien、Pascal Plaza、Monique M Martin
DOI:10.1016/s0009-2614(02)01480-x
日期:2002.10
Cis–trans photoisomerization of a photoactive yellow protein chromophore model, the deprotonated trans S-phenyl thio-p-hydroxycinnamate, is studied in aqueous solution by subpicosecond transient absorption and gain spectroscopy. The excited-state deactivation is found to involve the formation, in 1.7 ps, of an intermediate state which decays in 2.8 ps. A persistent bleaching signal is observed at longer
通过亚皮秒瞬态吸收和吸收光谱研究了一种具有光活性的黄色蛋白质生色团模型(去质子化的反S-苯基硫代-对羟基肉桂酸酯)的顺式-反式光异构化。发现激发态失活涉及在1.7 ps内形成中间态的形成,该中间态在2.8 ps内衰减。在更长的时间观察到持久的漂白信号,这表明激发态不仅松弛到基态,而且部分地形成稳定的光产物,可能是顺式异构体。此行为类似于天然光敏黄色蛋白的行为。