蛋白质中远红外集体模式的激发态寿命
Excited-state lifetimes of far-infrared collective modes in proteins.
作者信息
Xie A, van der Meer L, Austin R H
机构信息
Department of Physics, Oklahoma State University, Stillwater, OK 74078 USA.
出版信息
J Biol Phys. 2002 Jun;28(2):147-54. doi: 10.1023/A:1019986321524.
Abstract
Vibrational excitations of low frequency collective modes are essential for functionally important conformational transitions in proteins. Here we report the first direct measurement on the lifetime of vibrational excitations of the collective modes at 87 pm (115 cm(-1)) in bacteriorhodopsin, a transmembrane protein. The data show that these modes have extremely long lifetime of vibrational excitations, over 500 picoseconds, accommodating 1500vibrations. We suggest that there is a connection between this relativelyslow anharmonic relaxation rate of approximately 10 g sec(-1) and thesimilar observed rate of conformational transitions in proteins, which require require multi-level vibrational excitations and energy exchanges with othervibrational modes and collisional motions of solvent molecules.
摘要
低频集体模式的振动激发对于蛋白质中功能重要的构象转变至关重要。在此，我们报告了对一种跨膜蛋白细菌视紫红质中87皮米（115厘米⁻¹）处集体模式振动激发寿命的首次直接测量。数据表明，这些模式具有极长的振动激发寿命，超过500皮秒，容纳1500次振动。我们认为，这种约为10克秒⁻¹的相对较慢的非谐弛豫速率与蛋白质中观察到的类似构象转变速率之间存在联系，构象转变需要多级振动激发以及与其他振动模式和溶剂分子的碰撞运动进行能量交换。
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