Ultrafast Spectroscopy of Rhodopsins — Photochemistry at Its Best!

Ultrafast Spectroscopy of Rhodopsins — Photochemistry at Its Best!
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视紫红质的超快光谱——最佳光化学!

DOI:
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发表时间:
1995
期刊:
影响因子:
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通讯作者:
R. Mathies
R. Mathies
中科院分区:
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作者:
G. Kochendoerfer;R. Mathies

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最近激光技术的进步使我们能够实时研究视紫红质、细菌视紫红质和卤视紫红质中的超快初级光化学事件。综述了视紫红质的各种超快研究结果,重点是(1)反应速度和反应效率之间的关系及其对异构化机理的影响;(2)反应路径的均一性;(3)蛋白质在反应动力学中的作用。这些结果要求引入一种新的范式来描述这些超快反应,该范式具体考虑了相对于反应运动的振动退相和驰豫的时间尺度的重要性,以及振动相干对反应机制的贡献。
Recent advances in laser technology now allow us to study the ultrafast primary photochemical events in rhodopsin, bacteriorhodopsin, and halorhodopsin in real time. The results of various ultrafast studies of rhodopsins are reviewed with an emphasis on (1) the relationship between the reaction rate and reaction efficiency and its implications for the mechanism of isomerization, (2) the homogeneity of the reaction pathways, and (3) the role of the protein in the reaction dynamics. The results mandate the introduction of a new paradigm to describe these ultrafast reactions that specifically considers the importance of the timescale of vibrational dephasing and relaxation relative to the reactive motion and the contribution of vibrational coherence to the reaction mechanism.
视紫红质中视网膜质子化席夫碱抗衡离子的定位。
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