In this work, we deliver a proof of concept for a fast method that introduces pH effects into classical coarse-grained (CG) molecular dynamics simulations. Our approach is based upon the latest version of the popular Martini CG model to which explicit proton mimicking particles are added. We verify our approach against experimental data involving several different molecules and different environmental conditions. In particular, we compute titration curves, pH dependent free energies of transfer, and lipid bilayer membrane affinities as a function of pH. Using oleic acid as an example compound, we further illustrate that our method can be used to study passive translocation in lipid bilayers via protonation. Finally, our model reproduces qualitatively the expansion of the macromolecule dendrimer poly(propylene imine) as well as the associated pKa shift of its different generations. This example demonstrates that our model is able to pick up collective interactions between titratable sites in large molecules comprising many titratable functional groups.
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Titratable Martini model for constant pH simulations
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14 July 2020
Research Article|
July 13 2020
Titratable Martini model for constant pH simulations
Fabian Grünewald
;
Fabian Grünewald
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
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Paulo C. T. Souza
;
Paulo C. T. Souza
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
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Haleh Abdizadeh;
Haleh Abdizadeh
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
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Jonathan Barnoud
;
Jonathan Barnoud
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
2
Intangible Realities Laboratory, School of Chemistry, University of Bristol
, Bristol, United Kingdom
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Alex H. de Vries
;
Alex H. de Vries
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
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Siewert J. Marrink
Siewert J. Marrink
a)
1
Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen
, Groningen, The Netherlands
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the JCP Special Topic on Classical Molecular Dynamics (MD) Simulations: Codes, Algorithms, Force fields, and Applications.
J. Chem. Phys. 153, 024118 (2020)
Article history
Received:
May 18 2020
Accepted:
June 18 2020
Citation
Fabian Grünewald, Paulo C. T. Souza, Haleh Abdizadeh, Jonathan Barnoud, Alex H. de Vries, Siewert J. Marrink; Titratable Martini model for constant pH simulations. J. Chem. Phys. 14 July 2020; 153 (2): 024118. https://doi.org/10.1063/5.0014258
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