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Changes in Water Structure Induced by the Guanidinium Cation and Implications for Protein Denaturation

机译:胍盐阳离子诱导的水结构变化及其对蛋白质变性的影响

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摘要

The effect of the guanidinium cation on the hydrogen bonding strength of water was analyzed using temperature-excursion Fourier transform infrared spectra of the OH stretching vibration in 5% H2O / 95% D2O solutions containing a range of different guanidine-HCl and guanidine-HBr concentrations. Our findings indicate that the guanidinium cation causes the water H-bonds in solution to become more linear than those found in bulk water, and that it also inhibits the response of the H-bond network to increased temperature. Quantum chemical calculations also reveal that guanidinium affects both the charge distribution on water molecules directly H-bonded to it as well as the OH stretch frequency of H-bonds in which that water molecule is the donor. The implications of our findings to hydrophobic solvation and protein denaturation are discussed.
机译:使用温度变化的傅里叶变换红外光谱分析了5%的H2O / 95%的D2O溶液中的胍盐阳离子对水氢键强度的影响,该溶液在5%的H2O / 95%的D2O溶液中含有一系列不同的胍盐酸盐和胍盐酸盐浓度。我们的发现表明,胍阳离子导致溶液中的水H键变得比散装水中的线性更线性,并且还抑制了H键网络对温度升高的响应。量子化学计算还表明,胍不仅影响与氢键直接键合的水分子的电荷分布,还影响该水分子作为供体的氢键的OH拉伸频率。讨论了我们的发现对疏水溶剂化和蛋白质变性的影响。

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