Electrostatic Fields near the Active Site of Human Aldose Reductase: 2. New Inhibitors and Complications Caused by Hydrogen Bonds
作者:Lin Xu、Aina E. Cohen、Steven G. Boxer
DOI:10.1021/bi200930f
日期:2011.10.4
the nitrile probe. The interpretation of these two peaks as a hydrogen bond formation–dissociation process between the probe nitrile group and a nearby amino acid side chain is used to explain the observation of two IR bands, and the simulations were used to investigate the molecular details of this conformational change. Hydrogen bonding complicates the simplest analysis of vibrational frequency shifts
振动斯塔克效应光谱用于测量人醛糖还原酶 ( h ALR2)活性位点疏水区的静电场。设计并合成了一种新的含腈抑制剂,并在 1.3 Å 分辨率下确定了其复合物的 X 射线结构,以及辅因子 NADP +和野生型h ALR2。发现腈位于 T113 附近,与氢键相互作用一致。当抑制剂与野生型h结合时,在室温下在腈区观察到两个振动吸收峰ALR2,表明腈探针经历了两种不同的微环境,通过与不存在与腈的氢键的 T113A 突变体相比,可以凭经验将这些微环境分为氢键和非氢键种群。基于该结构的经典分子动力学模拟预测沿腈探针投射的蛋白质电场中的双峰分布。将这两个峰解释为探针腈基团和附近氨基酸侧链之间的氢键形成 - 解离过程用于解释对两个红外波段的观察,并使用模拟来研究这种构象的分子细节改变。