在三个氧化还原状态下,在flavodoxin的功能位点映射溶解动力学
Chih-Wei Chang1, Ting-Fang He, Lijun Guo
1Department of Physics, Ohio State University, Columbus, Ohio 43210, USA.
Journal of the American Chemical Society
|August 25, 2010
概括
在黄蛋白功能位点的动态溶解是电子转移的关键. 我们在氧化还原状态中描述了flavodoxin溶解动态,揭示了蛋白质和水的灵活性是如何适应的,这对生物功能至关重要.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 结构生物学 结构生物学
背景情况:
- 黄蛋白是重要的氧化还原共酶.
- 了解黄蛋白功能需要了解活性位点的动态溶解.
- 电子转移特性与溶解动力学密切相关.
研究的目的:
- 描述三种氧化还原状态下霍洛夫拉伏多克素的功能位溶解.
- 为了研究Apoflavodoxin的结合点溶解.
- 阐明氧化还原状态,蛋白质构成和水网络灵活性之间的关系.
主要方法:
- 作为光学探针,利用了内在的黄素辅因子和托残留物.
- 采用特定地点的突变来探测溶解动态.
- 分析了多个时间尺度 (比秒到数百比秒) 的溶解动态.
主要成果:
- 在不同氧化还原状态下,在函数位点观察到明显的超快溶解动态.
- 确定了三个放松阶段:水网络放松 (1-2.6 ps),合水蛋白波动 (20-40 ps) 和循环波动 (数百 ps).
- 与氧化还原状态相关的溶解动力学幅度:氧化,半,.
结论:
- 氧化还原状态动态控制局部蛋白质构成可塑性和水网灵活性.
- 这种复杂的关系对于蛋白质间电子转移的生物功能至关重要.
- 鉴定提供了对黄蛋白机制的关键见解.
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