用振动光谱探测基结合的环境影响:对理解基转移和酶催化学的影响
Hu Cheng1, Ivana Nikolic-Hughes, Jianghua H Wang
1Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461-1602, USA.
Journal of the American Chemical Society
|September 19, 2002
概括
振动光谱学揭示了基团键与不同替代剂和溶剂的微妙,规律的变化. 这些由静电相互作用影响的结合特性可能反映了酶活性部位的环境.
科学领域:
- 生物化学和生物物理学
- 化学物理 化学物理
- 频谱学是一种光谱学.
背景情况:
- 单替代的二酸酸盐是重要的生物基质.
- 了解它们的内在特性和环境敏感性是关键.
- 振动光谱学为基组的局部环境提供了一个潜在的探测器.
研究的目的:
- 通过振动光谱学研究二离子酸盐中的基的结合特性.
- 评估振动光谱作为基基组局部环境的传感器的能力.
- 探索基态结合和反应性之间的关系.
主要方法:
- 基替代剂和溶剂环境的系统变化.
- 通过振动光谱学对基结合的详细检查.
- 对债券长度,pK (a) 值和溶剂效应的相关性分析.
主要成果:
- 桥梁P-O(R) 键长度和替代醇的pK(a) 之间观察到一个线性相关性.
- 添加二甲基硫氧化物 (DMSO) 延长了桥梁键,表明溶剂对溶解和键顺序的影响.
- 基态结合的变化显示,对反应率差异的能量贡献比以前提出的要小,而静电相互作用被确定为共同的驱动力.
结论:
- 基聚合物对环境变化做出微妙但定期的反应.
- 振动光谱可以探测基基的局部环境.
- 酶结合基质中的基态扭曲可能表明静电活性位点环境.
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