高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (6): 812.

• 研究论文 • 上一篇    下一篇

猪胰岛素的活力位置的电子结构分析

叶元杰   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1992-05-12 修回日期:1993-03-10 出版日期:1993-06-24 发布日期:1993-06-24
  • 基金资助:

    国家自然科学基金

Electronic Structure Analysis for Active Sites of Pig Insulin

YE Yuan-Jie   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1992-05-12 Revised:1993-03-10 Online:1993-06-24 Published:1993-06-24

摘要: 本文采用负因子计数方法对猪胰岛素分子作了完整分子的量子化学计算,其中对矩阵元的计算采用EHMO方法。我们将前线轨道的概念推广为靠近Fermi能级的能量区域中的分子轨道,将局域于少数氨基酸残基上的前线轨道简称为活性轨道。计算结果表明,猪胰岛素70%的活力敏感位置上局域有活性轨道。对全部结果的分析说明猪胰岛素的活性轨道和生物活力之间存在某些内在联系,但不是一一对应关系;猪胰岛素的三级构象的变化可以引起电子结构的变化;相同种类的氨基酸残基在分子的不同位置上可以有不同的活性轨道能级和轨道分布。

关键词: 胰岛素, 活力位置, 电子结构

Abstract: The quantum chemical calculation of the entire molecule of pig insulin is carried out by the extended negative factor counting method, in which the matrix elements are calculated in EHMOscheme.The concept of frontier orbitals is extended to involve those molecular orbitals with energies near to the Fermi level.The frontier orbitals localized at a few residues are simply named as "active orbitals".The results show that there are active orbitals at 70% of the active sites of pig insulin.The results show that there might be intrinsic relationship between the active orbitals of pig insulin and its biological activities but there is not 1-1 correspondance.The change of the three-dimensional conformation of pig insulin could result in the change of its electronic structures.The residues of the same kind may have different energy levels and distribution of active orbitals when they are in the different positions of the molecule.

Key words: Insulin, Active sites, Electronic structure

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