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Abstract:

We present a density functional theory (DFT) hybrid quantum mechanical/molecular mechanical (QM-MM) implementation developed for simulations of reactions in complex environments. It is particularly suited to study enzyme active sites or solutes in condensed phases. The method combines a QM description of the solute with a MM treatment of the environment. The QM fragment is treated using DFT as implemented in the computationally efficient program SIESTA, while the environment is treated using the Wang et al. Amber force field parametrization. We applied our new QM-MM scheme to study the conversion of chorismate to prephenate by computing the reaction energy profile in vacuo, aqueous solution and in the active site of the B. subtilis chorismate mutase enzyme. We have performed calculations for two different choices of the QM subsystem in the enzyme simulations: including only the substrate moiety and the substrate plus the charged side chains glu78 and arg90, respectively. In both cases, our results are in good agreement with experiment. The catalytic activity achieved by chorismate mutase relative to the uncatalyzed reaction in solution is due to both a minor destabilization of the substrate molecule by compression and a major electrostatic stabilization of the transition state, which reduce the activation energy of the reaction.

Registro:

Documento: Artículo
Título:A DFT-based QM-MM approach designed for the treatment of large molecular systems: Application to chorismate mutase
Autor:Crespo, A.; Scherlis, D.A.; Martí, M.A.; Ordejón, P.; Roitberg, A.E.; Estrin, D.A.
Filiación:DQI, AQF and INQUIMAE-CONICET, Facultad de Cie. Exactas y Naturales, Univ. de Buenos Aires, Ciudad Universitaria - Pab II, C1428EHA Buenos Aires, Argentina
Inst. Cie. de Mat. de Barcelona-CSIC, Campus de la U.A.B., 08193 Bellaterra, Barcelona, Spain
Quantum Theory Project, Department of Chemistry, University of Florida, Gainesville, FL 32611-8435, United States
Palabras clave:Activation energy; Catalysis; Catalyst activity; Computer simulation; Molecular structure; Numerical analysis; Probability density function; Quantum theory; Chorismate mutase; Lennard-Jones potential interactions; Molecular mechanical scheme; Enzymes
Año:2003
Volumen:107
Número:49
Página de inicio:13728
Página de fin:13736
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:15206106
CODEN:JPCBF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v107_n49_p13728_Crespo

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Citas:

---------- APA ----------
Crespo, A., Scherlis, D.A., Martí, M.A., Ordejón, P., Roitberg, A.E. & Estrin, D.A. (2003) . A DFT-based QM-MM approach designed for the treatment of large molecular systems: Application to chorismate mutase. Journal of Physical Chemistry B, 107(49), 13728-13736.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v107_n49_p13728_Crespo [ ]
---------- CHICAGO ----------
Crespo, A., Scherlis, D.A., Martí, M.A., Ordejón, P., Roitberg, A.E., Estrin, D.A. "A DFT-based QM-MM approach designed for the treatment of large molecular systems: Application to chorismate mutase" . Journal of Physical Chemistry B 107, no. 49 (2003) : 13728-13736.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v107_n49_p13728_Crespo [ ]
---------- MLA ----------
Crespo, A., Scherlis, D.A., Martí, M.A., Ordejón, P., Roitberg, A.E., Estrin, D.A. "A DFT-based QM-MM approach designed for the treatment of large molecular systems: Application to chorismate mutase" . Journal of Physical Chemistry B, vol. 107, no. 49, 2003, pp. 13728-13736.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v107_n49_p13728_Crespo [ ]
---------- VANCOUVER ----------
Crespo, A., Scherlis, D.A., Martí, M.A., Ordejón, P., Roitberg, A.E., Estrin, D.A. A DFT-based QM-MM approach designed for the treatment of large molecular systems: Application to chorismate mutase. J Phys Chem B. 2003;107(49):13728-13736.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v107_n49_p13728_Crespo [ ]