摘要
发展了应用于鸟嘌呤G和氨基酸残基体系的浮动电荷力场,该力场明确定义了孤对电子和键的电荷和位置,通过电荷随着环境的浮动来体现极化效应;通过氢键拟合函数kHB描绘了氢键键能.应用量子化学方法,对G与氨基酸残基体系从氢键、几何结构及电荷分布3个方面展开计算及分析,并以其为基准,确定参数发展了适用于G与氨基酸残基氢键体系的ABEEMσπPFF.采用3种不同力场模拟目标分子的结构和性质.模拟结果表明,发展的ABEEMσπPFF与量子化学方法具有最好的一致性,可用于模拟生物大分子体系.
The recognition of DNA depends mainly on the hydrogen bonding between corresponding residues of the enzyme and base. Hydrogen bonding is important for maintaining the stability of DNA and protein structures . In order to more realistically simulate biomolecules, a polarization force field(PFF) has been proposed . The main difference between the different force fields is the handling of electrostatic interactions. A fluctuating charge force field was developed and applied to guanine G and amino acid residue systems. In order to accurately describe the hydrogen bond, the force field clearly defines the charge and position of the lone pair of electrons and bonds. The polarization effect was reflected by the floating of the charge with the environment. The position of the lone pair of electrons has a good control of the angle of hydrogen bonds. The hydrogen bond energy was depicted by the hydrogen bond fitting function k HB . The quantum chemical method was used to calculate and analyze the G and amino acid residue systems from hydrogen bond, geometry and charge distribution. Based on this, the parameter was confirmed and applied to the hydrogen bond system of G and amino acid residues. Three different force fields were used to simulate the structure and property of target molecules. The simulation results show that the developed ABEEM σπ PFF has the best consistency with the quantum chemical method.
作者
许炎
刘翠
韩成娟
潘明玉
孙照琦
韩冰玉
杨忠志
XU Yan;LIU Cui;HAN Chengjuan;PAN Mingyu;SUN Zhaoqi;HAN Bingyu;YANG Zhongzhi(School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第2期288-297,共10页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21133005
21603091)
辽宁师范大学创新实践项目(批准号:cx201801012)资助~~
关键词
极化力场
氢键
碱基
氨基酸残基
Polarization force field
Hydrogen bond
Base
Amino acid residue
作者简介
联系人简介:刘 翠,女,博士,讲师,主要从事理论与计算化学研究. E-mail: liuc@lnnu.edu.cn.
