Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (2): 288.doi: 10.7503/cjcu20180653

• Physical Chemistry • Previous Articles     Next Articles

Development of Polarization Force Field for Guanine and Amino Acid Residues Systems

XU Yan, LIU Cui*(), HAN Chengjuan, PAN Mingyu, SUN Zhaoqi, HAN Bingyu, YANG Zhongzhi   

  1. School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, China
  • Received:2018-09-26 Online:2019-02-10 Published:2018-11-19
  • Contact: LIU Cui E-mail:liuc@lnnu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21133005, 21603091) and the Innovative Practice Program of Liaoning Normal University, China(No.cx201801012)

Abstract:

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 kHB. 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 ABEEMσπ PFF has the best consistency with the quantum chemical method.

Key words: Polarization force field, Hydrogen bond, Base, Amino acid residue

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