波谱学杂志 ›› 2005, Vol. 22 ›› Issue (2): 163-172.

• 研究论文 • 上一篇    下一篇

原子电性作用矢量用于氨基酸化学位移计算

  

  1. 1.重庆大学 生物医学工程教育部与重庆市重点实验室; 2.重庆大学 化学化工学院;  3.重庆大学 生物工程学院,重庆 400044
  • 收稿日期:2004-11-29 修回日期:2005-02-21 出版日期:2005-06-05 发布日期:2005-06-05
  • 基金资助:

    霍英东基金(1998-7-6),国家春晖计划教育部启动基金(1999-1-4/38)及重庆大学创新基金(2003-5-6)资助项目.

Calculation of 13C Chemical Shifts of Amino Acids Using Atomic Electronegativity Interaction Vector

  1. 1.Key Laboratory of Biomedical Engineering of Ministry of Education and Chongqing City, Chongqing 400044, China; 
    2.College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China; 
    3.College of Bioengineering, Chongqing University, Chongqing 400044, China
  • Received:2004-11-29 Revised:2005-02-21 Online:2005-06-05 Published:2005-06-05
  • Supported by:

    霍英东基金(1998-7-6),国家春晖计划教育部启动基金(1999-1-4/38)及重庆大学创新基金(2003-5-6)资助项目.

摘要:

提出了用于表征分子内部化学微环境的结构描述子:原子电性作用矢量(AEIV),并将其应用于20个天然氨基酸103个13C 原子核磁共振化学位移CS建模:δ =-190.514+7.352×ν1+63.998×ν2+49.252×ν3+39.678×ν4,取得优良效果. 模型值、留一法(LOO)和留分法(LMO)交互校验的复相关系数分别为RMM=0.966 0, RLOO=0.957 7和RLMO=0.957 7.

关键词: 13C NMR, 定量结构波谱关系, 原子电性作用矢量, 氨基酸, 化学微环境

Abstract:

A novel method based on atomic electronegativity interaction vector (AEIV) was developed to describe chemical environment and atomic state in amino acids, and to predict 13C chemical shifts. One hundred and three 13C chemical shifts for twenty natural amino acids were calculated by the method. The precision of calculation is cross-validated using the chemical shifts calculated by established methods, including molecular modeling, the leave-one-out (LOO) method and the leave-molecule-out (LMO) method. The correlation coefficients (R) obtained are RMM=0.966, RLOO=0.958 and RLOO=0.950, respectively. The model developed was also applied to predict fifteen 13C NMR chemical shifts for two newly discovered natural amino acids.

Key words: nuclear magnetic resonance,  13C NMR, atomic electronegativity interaction vector, amino acid, chemical shif

中图分类号: