Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (2): 239-247.doi: 10.1007/s40242-017-6401-x

• Articles • Previous Articles     Next Articles

Studies on Hydrolysis Mechanism of Anticancer Ruthenium Drug ImH[trans-Ru(Im)2Cl4] via ABEEMσπ Polarizable Force Field Combined with QM and MD-FEP

LI Hui, ZOU Huiyuan, LIU Linlin, ZHAO Dongxia, YANG Zhongzhi   

  1. School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, P. R. China
  • Received:2016-09-29 Revised:2016-11-09 Online:2017-04-01 Published:2016-12-19
  • Contact: ZHAO Dongxia,E-mail:zhaodx@lnnu.edu.cn;YANG Zhongzhi,E-mail:zzyang@lnnu.edu.cn E-mail:zhaodx@lnnu.edu.cn;zzyang@lnnu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21133005, 21473083).

Abstract:

We used ABEEMσπ(atom-bond electronegativity equalization method) polarizable force field(ABEEMσπ PFF) method combined with QM and molecular dynamics-free energy perturbation(MD-FEP) methods to investigate the function of water molecules in hydrolysis process of ImH[trans-Ru(Im)2Cl4](ICR). The activation free energies obtained via MD-FEP calculation are in fair agreement with the experimental data. In addition, QM/MM(ABEEM) rationally describes the charge distributions and the electrostatic interaction between molecules. ABEEMσπ fluctuating charge model has the following good characteristics:(1) not only atomic charge regions but also σ, π bond and lone pair charge regions are explicitly represented for a molecule; (2) the region charges are geometry dependent and calculated from time to time in the dynamic simulation without any iterative procedure so that its performance is time-saving compared with the Drude model and induced dipole model.

Key words: Atom-bond electronegativity equalization method(ABEEMσπ) polarizable force field, Quantum mechanics/molecular mechanics(QM/MM), Molecular dynamics-free energy perturbation, Hydrolysis mechanism, Activation free energy