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Title: Efficient Computation of Free Energy Surfaces of Diels–Alder Reactions in Explicit Solvent at Ab Initio QM/MM Level

Abstract

For Diels–Alder (DA) reactions in solution, an accurate and converged free energy (FE) surface at ab initio (ai) quantum mechanical/molecular mechanical (QM/MM) level is imperative for the understanding of reaction mechanism. However, this computation is still far too expensive. In a previous work, we proposed a new method termed MBAR+wTP, with which the computation of the ai FE profile can be accelerated by several orders of magnitude via a three-step procedure: (I) an umbrella sampling (US) using a semi-empirical (SE) QM/MM Hamiltonian is performed; (II) the FE profile is generated using the Multistate Bennett Acceptance Ratio (MBAR) analysis; and (III) a weighted Thermodynamic Perturbation (wTP) from the SE Hamiltonian to the ai Hamiltonian is performed to obtain the ai QM/MM FE profile using weight factors from the MBAR analysis. In this work, this method is extended to the calculations of two-dimensional FE surfaces of two Diels–Alder reactions of cyclopentadiene with either acrylonitrile or 1-4-naphthoquinone at ai QM/MM level. The accurate activation free energies at the ai QM/MM level, which are much closer to the experimental measurements than those calculated by other methods, indicate that this MBAR+wTP method can be applied in the studies of complex reactions in condensed phase withmore » much-enhanced efficiency.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [4]
  1. East China Normal Univ., Shanghai (China). State Key Lab. of Precision Spectroscopy, School of Physics and Materials Science
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. East China Normal Univ., Shanghai (China). Computer Center, School of Computer Science and Software Engineering
  4. East China Normal Univ., Shanghai (China). State Key Lab. of Precision Spectroscopy, School of Physics and Materials Science; Univ. of Oklahoma, Norman, OK (United States); NYU Shanghai, Shanghai (China). NYU-ECNU Center for Computational Chemistry
Publication Date:
Research Org.:
Q-Chem, Inc., Pleasanton, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1611615
Grant/Contract Number:  
SC0011297; 21773066
Resource Type:
Accepted Manuscript
Journal Name:
Molecules
Additional Journal Information:
Journal Volume: 23; Journal Issue: 10; Journal ID: ISSN 1420-3049
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Biochemistry & Molecular Biology; Chemistry; Diels–Alder reaction; free energy surface; ab initio; reference-potential method; umbrella sampling

Citation Formats

Li, Pengfei, Liu, Fengjiao, Jia, Xiangyu, Shao, Yihan, Hu, Wenxin, Zheng, Jun, and Mei, Ye. Efficient Computation of Free Energy Surfaces of Diels–Alder Reactions in Explicit Solvent at Ab Initio QM/MM Level. United States: N. p., 2018. Web. doi:10.3390/molecules23102487.
Li, Pengfei, Liu, Fengjiao, Jia, Xiangyu, Shao, Yihan, Hu, Wenxin, Zheng, Jun, & Mei, Ye. Efficient Computation of Free Energy Surfaces of Diels–Alder Reactions in Explicit Solvent at Ab Initio QM/MM Level. United States. https://doi.org/10.3390/molecules23102487
Li, Pengfei, Liu, Fengjiao, Jia, Xiangyu, Shao, Yihan, Hu, Wenxin, Zheng, Jun, and Mei, Ye. Fri . "Efficient Computation of Free Energy Surfaces of Diels–Alder Reactions in Explicit Solvent at Ab Initio QM/MM Level". United States. https://doi.org/10.3390/molecules23102487. https://www.osti.gov/servlets/purl/1611615.
@article{osti_1611615,
title = {Efficient Computation of Free Energy Surfaces of Diels–Alder Reactions in Explicit Solvent at Ab Initio QM/MM Level},
author = {Li, Pengfei and Liu, Fengjiao and Jia, Xiangyu and Shao, Yihan and Hu, Wenxin and Zheng, Jun and Mei, Ye},
abstractNote = {For Diels–Alder (DA) reactions in solution, an accurate and converged free energy (FE) surface at ab initio (ai) quantum mechanical/molecular mechanical (QM/MM) level is imperative for the understanding of reaction mechanism. However, this computation is still far too expensive. In a previous work, we proposed a new method termed MBAR+wTP, with which the computation of the ai FE profile can be accelerated by several orders of magnitude via a three-step procedure: (I) an umbrella sampling (US) using a semi-empirical (SE) QM/MM Hamiltonian is performed; (II) the FE profile is generated using the Multistate Bennett Acceptance Ratio (MBAR) analysis; and (III) a weighted Thermodynamic Perturbation (wTP) from the SE Hamiltonian to the ai Hamiltonian is performed to obtain the ai QM/MM FE profile using weight factors from the MBAR analysis. In this work, this method is extended to the calculations of two-dimensional FE surfaces of two Diels–Alder reactions of cyclopentadiene with either acrylonitrile or 1-4-naphthoquinone at ai QM/MM level. The accurate activation free energies at the ai QM/MM level, which are much closer to the experimental measurements than those calculated by other methods, indicate that this MBAR+wTP method can be applied in the studies of complex reactions in condensed phase with much-enhanced efficiency.},
doi = {10.3390/molecules23102487},
journal = {Molecules},
number = 10,
volume = 23,
place = {United States},
year = {Fri Sep 28 00:00:00 EDT 2018},
month = {Fri Sep 28 00:00:00 EDT 2018}
}

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Hybrid ab Initio Quantum Mechanics/Molecular Mechanics Calculations of Free Energy Surfaces for Enzymatic Reactions:  The Nucleophilic Attack in Subtilisin
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Free energy calculation on enzyme reactions with an efficient iterative procedure to determine minimum energy paths on a combined ab initio QM/MM potential energy surface
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