Abstract:
One of the main goals of chemistry is to understand the underlying principles of chemical reactions, in terms of both its reaction mechanism and the thermodynamics that govern it. Using hybrid quantum mechanics/molecular mechanics (QM/MM)-based methods in combination with a biased sampling scheme, it is possible to simulate chemical reactions occurring inside complex environments such as an enzyme, or aqueous solution, and determining the corresponding free energy profile, which provides direct comparison with experimental determined kinetic and equilibrium parameters. Among the most promising biasing schemes is the multiple steered molecular dynamics method, which in combination with Jarzynski's Relationship (JR) allows obtaining the equilibrium free energy profile, from a finite set of nonequilibrium reactive trajectories by exponentially averaging the individual work profiles. However, obtaining statistically converged and accurate profiles is far from easy and may result in increased computational cost if the selected steering speed and number of trajectories are inappropriately chosen. In this small review, using the extensively studied chorismate to prephenate conversion reaction, we first present a systematic study of how key parameters such as pulling speed, number of trajectories, and reaction progress are related to the resulting work distributions and in turn the accuracy of the free energy obtained with JR. Second, and in the context of QM/MM strategies, we introduce the Hybrid Differential Relaxation Algorithm, and show how it allows obtaining more accurate free energy profiles using faster pulling speeds and smaller number of trajectories and thus smaller computational cost. © 2016 Elsevier Inc.
Registro:
Documento: |
Artículo
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Título: | Steered Molecular Dynamics Methods Applied to Enzyme Mechanism and Energetics |
Autor: | Ramírez, C.L.; Martí, M.A.; Roitberg, A.E. |
Filiación: | FCEN, UBA, Buenos Aires, Argentina University of Florida, Gainesville, FL, United States
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Palabras clave: | Free energy; Jarzynski relationship; Multiple time step; Nonequilibrium dynamics; chorismic acid; prephenate dehydratase; amidase; bacterial protein; chorismate mutase; cyclohexanecarboxylic acid derivative; cyclohexene derivative; N-acetyl-1-D-inosityl-2-amino-2-deoxy-alpha-D-glucopyranoside deacetylase; prephenic acid; algorithm; analytic method; chemical reaction; computer simulation; energy transfer; enzyme mechanism; molecular dynamics; molecular mechanics; quantum mechanics; thermodynamics; Bacillus subtilis; chemistry; enzyme specificity; enzymology; kinetics; metabolism; molecular dynamics; Mycobacterium tuberculosis; quantum theory; static electricity; Algorithms; Amidohydrolases; Bacillus subtilis; Bacterial Proteins; Chorismate Mutase; Chorismic Acid; Cyclohexanecarboxylic Acids; Cyclohexenes; Kinetics; Molecular Dynamics Simulation; Mycobacterium tuberculosis; Quantum Theory; Static Electricity; Substrate Specificity; Thermodynamics |
Año: | 2016
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Volumen: | 578
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Página de inicio: | 123
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Página de fin: | 143
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DOI: |
http://dx.doi.org/10.1016/bs.mie.2016.05.029 |
Título revista: | Methods in Enzymology
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Título revista abreviado: | Methods Enzymol.
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ISSN: | 00766879
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CODEN: | MENZA
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CAS: | chorismic acid, 617-12-9; prephenate dehydratase, 9044-88-6; amidase, 9012-56-0; chorismate mutase, 9068-30-8; Amidohydrolases; Bacterial Proteins; Chorismate Mutase; Chorismic Acid; Cyclohexanecarboxylic Acids; Cyclohexenes; N-acetyl-1-D-inosityl-2-amino-2-deoxy-alpha-D-glucopyranoside deacetylase; prephenic acid
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00766879_v578_n_p123_Ramirez |
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Citas:
---------- APA ----------
Ramírez, C.L., Martí, M.A. & Roitberg, A.E.
(2016)
. Steered Molecular Dynamics Methods Applied to Enzyme Mechanism and Energetics. Methods in Enzymology, 578, 123-143.
http://dx.doi.org/10.1016/bs.mie.2016.05.029---------- CHICAGO ----------
Ramírez, C.L., Martí, M.A., Roitberg, A.E.
"Steered Molecular Dynamics Methods Applied to Enzyme Mechanism and Energetics"
. Methods in Enzymology 578
(2016) : 123-143.
http://dx.doi.org/10.1016/bs.mie.2016.05.029---------- MLA ----------
Ramírez, C.L., Martí, M.A., Roitberg, A.E.
"Steered Molecular Dynamics Methods Applied to Enzyme Mechanism and Energetics"
. Methods in Enzymology, vol. 578, 2016, pp. 123-143.
http://dx.doi.org/10.1016/bs.mie.2016.05.029---------- VANCOUVER ----------
Ramírez, C.L., Martí, M.A., Roitberg, A.E. Steered Molecular Dynamics Methods Applied to Enzyme Mechanism and Energetics. Methods Enzymol. 2016;578:123-143.
http://dx.doi.org/10.1016/bs.mie.2016.05.029