Study on the molecular conformational equilibrium of butane for the development of an experimental model system of the hydrophobic effect

丁烷分子构象平衡研究，用于疏水效应实验模型系统的开发

基本信息

批准号：
15550020
负责人：
KATO Minoru
金额：
$ 1.41万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

It is well-known that the hydrophobic effect is a critical factor for structural stability of proteins. The purpose of this project is to develop an experimental model for the hydrophobic effect. As a model, we investigated conformational equilibrium of simple chain molecules by using Raman spectroscopy. The most simple and ideal model is the trans gauche equilibrium of butane. We first target this system in aqueous solution. However, it was difficult to observe the equilibrium by Raman spectroscopy due to the low solubility of butane into water. During this project term, we succeed to observe qualitatively the equilibrium, indicating that the relative population of the gauche conformer increased compared with the organic solvent systems. The further experiments for the quantitative analysis are in progress. As another targets we investigated trans-gauche/gauche-gauche equilibrium of diethyl disulfide, which is a model for disulfide bonds for proteins. We elucidated the effect of temperature and pressure on the equilibrium, and discuss the phenomena in comparison with the conformational change of disulfide of a protein when it unfolds. The other research results were obtained for a simple peptide system. We target a simple alanine-rich peptide as a model molecule, which is suitable to observe the helix-coil equilibrium in water. Effect of pressure on the equilibrium showed that the relative population of helix form increases with increasing pressure. This behavior is apparently inconsistent with pressure-induced unfolding of protein. Further projects for elucidating the inconsistency are in progress.

众所周知，疏水作用是蛋白质结构稳定性的关键因素。该项目的目的是为疏水作用开发实验模型。作为模型，我们使用拉曼光谱法研究了简单链分子的构象平衡。最简单和理想的模型是丁烷的反式Gauche平衡。我们首先在水溶液中靶向该系统。但是，由于丁烷对水的溶解度较低，很难观察到拉曼光谱的平衡。在这个项目术语中，我们成功地观察了平衡，表明与有机溶剂系统相比，Gauche构象异构体的相对种群增加。定量分析的进一步实验正在进行中。作为另一个目标，我们研究了二甲基二硫化物的反式透视/gauche-gauche平衡，这是蛋白质二硫键键的模型。我们阐明了温度和压力对平衡的影响，并讨论了与蛋白质展开时二硫化物的构象变化相比的现象。对于简单的肽系统，获得了其他研究结果。我们将富含丙氨酸的肽作为模型分子靶向，该肽适合观察水中的螺旋线油平平衡。压力对平衡的影响表明，螺旋形式的相对群体随压力增加而增加。这种行为显然与压力引起的蛋白质展开不一致。阐明不一致的进一步项目正在进行中。

项目成果

期刊论文数量（26）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

FT-IR Spectroscopic Study on Conformational Equilibria of [Leu]^5-Enkephalin in DMSO and ^2H_2O Solutions

DMSO和^2H_2O溶液中[Leu]^5-脑啡肽构象平衡的红外光谱研究

DOI：
发表时间：
2004
期刊：
J.Mol.Liq. 119(1-3)
影响因子：
0
作者：
T.Imai;T.Takekiyo;A.Kovalenko;F.Hiata;M.Kato;Y.Taniguchi;Takahiro Takekiyo et al.;Takahiro Takekiyo et al.;Hideto Isogai et al.;Takahiro Takekiyo et al.;Takahiro Takekiyo et al.
通讯作者：
Takahiro Takekiyo et al.

Raman Study of Hydration Effect on Conformational Equilibria of Haloacetones

卤代丙酮水合效应对构象平衡的拉曼研究

DOI：
发表时间：
2003
期刊：
Bull.Chem.Soc.Jpn 76
影响因子：
0
作者：
T.Imai;T.Takekiyo;A.Kovalenko;F.Hiata;M.Kato;Y.Taniguchi;Takahiro Takekiyo et al.;Takahiro Takekiyo et al.;Hideto Isogai et al.;Takahiro Takekiyo et al.;Takahiro Takekiyo et al.;Yosuke Shiratori et al.
通讯作者：
Yosuke Shiratori et al.

H.Isogai, M.Kato, Y.Taniguchi: "Effects of Pressure and Solvents on the Infrared Absorption Intensity of the O-H Stretching Mode of Phenol in Solutions"Spectrochim.Acta Part A. (印刷中). (2004)

H.Isogai、M.Kato、Y.Taniguchi：“压力和溶剂对溶液中苯酚 O-H 拉伸模式的红外吸收强度的影响”Spectrochim.Acta Part A（出版中）。