蛋白质中托的五秒钟圆交叉动态和水化层动态减速的验证
Jin Yang1, Luyuan Zhang, Lijuan Wang
1Department of Physics, and Program of Biophysics, The Ohio State University, Columbus, Ohio 43210, USA.
Journal of the American Chemical Society
|September 21, 2012
概括
托芬状态 (1La和1Lb) 的超快速内部转化不会影响最初的蛋白质水合. 这项研究证实了蛋白质表面附近的水运动减缓,验证了以前的发现.
科学领域:
- 生物物理学的生物物理.
- 蛋白质动力学 蛋白质动力学
- 频谱学是一种光谱学.
背景情况:
- 蛋白质表面附近的水运动显著减缓.
- 托的超快速内部转化对初始水合的影响尚不清楚.
- 烯酸有两个几乎退化的电子状态: (1) La 和 (1) Lb.
研究的目的:
- 研究托的 (1) La和 (1) Lb状态的内部转化动态如何影响初始蛋白质水合.
- 在蛋白质环境中描述这两种状态之间的转换时间尺度.
- 为了验证水化层动态的观察到的减速.
主要方法:
- 通过局部定向的突变发生法,在10个不同的位置创建了一个含有托的小蛋白质.
- 使用 anisotropy 动态测量来描述转换动态.
- 使用光谱技术来探测水的运动和水化动态.
主要成果:
- 所有的 (1) La 和 (1) Lb 状态之间的内部转换时间尺度都在 40-80 femtoseconds 范围内观察到.
- 超快速的内部转化对最初观察到的水化动态没有明显的影响.
- 该研究重新验证了蛋白质表面周围的水化层动态减缓.
结论:
- 托的 (1) La和 (1) Lb状态的超快速内部转化不会影响最初的蛋白质水合.
- 这些发现证实并验证了蛋白质水化层中水运动的显著减速.
- 这项研究阐明了托电子状态在蛋白质水化动态中的作用.
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