高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (9): 1288.

• 论文 • 上一篇    下一篇

反相液相色谱中温度对蛋白分子构象变化的新表征

时亚丽, 马凤, 耿信笃   

  1. 西北大学现代分离科学研究所, 西安, 710069
  • 收稿日期:1993-11-02 修回日期:1994-04-15 出版日期:1994-09-24 发布日期:1994-09-24
  • 通讯作者: 耿信笃.
  • 作者简介:时亚丽,女,48岁,副编审.
  • 基金资助:

    国家自然科学基金

A New Characterization Parameter for Molecular Conformation Change of Proteins in Reversed-phase Liquid Chromatography

SHI Ya-Li, MA Feng, GENG Xin-Du   

  1. Institute of Modern Separation Science, Northwest University, Xi'an, 710069
  • Received:1993-11-02 Revised:1994-04-15 Online:1994-09-24 Published:1994-09-24

摘要: 液相色谱中溶质计量置换保留模型的Z值可用来对反相高效液相色谱中热变蛋白的分子构象进行表征。发现在异丙醇-甲酸44%(V/V)-水体系为流动相时完全变性蛋白的Z值随温度升高而降低,且Z值与绝对温度倒数(1/T)成正比,因此蛋白分子构象变化可用Z对1/T作图所得两条直线的斜率差值来表征,差值愈大,蛋白分子构象变化愈甚。该两直线的交点即为蛋白分子构象的突变温度。与通常采用的1gk'对1/T的作图相比,用Z对1/T作图对蛋白分子构象进行表征不仅对各种热变蛋白都有效,而且结果准确。

关键词: 液相色谱, 蛋白质, 分子构象, 蛋白热变性

Abstract: The Zvalue of the stoichiometric displacement model for retention can be used to be a new chracterization parameter for the molecular conformation of biopolymers caused by temperature in reversed-phase liquid chromatography(RPLC).It was found that when 2-propanol 44%(V/V)-formic acid-water was selected as a mobile phase, the Zvalues of four kinds of completely denaturated proteins decreased with the increase of temperature and the Zvalue changes would be directly proportional to the reciprocal of absolute termperature (1/T).The chracterization of the change in the molecular conformation of biopolymers in the instance can be obtained by means of the difference between the two slopes of each proteins from the plots of Zvs. 1/T, and the larger the difference, the greater the change in the molecular conformation of the protein is. The abrupt change temperatures for each proteins can be calculated from the intersect of the two straight lines. Compared to the characterization of molecular conformation of proteins with the plot of 1gk'(k'is the capacity factor)versus 1/T, the plot Zversus 1/Tis not only valid for each type of proteins, but also is more accurate.

Key words: Liquid chromatography, Protein, Molecular conformation, Thermal denaturation

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