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• W2008174310 abstract "Recent development of constant pH molecular dynamics (CpHMD) methods has offered promise for adding pH-stat in molecular dynamics simulations. However, until now the working pH molecular dynamics (pHMD) implementations are dependent in part or whole on implicit-solvent models. Here we show that proper treatment of long-range electrostatics and maintaining charge neutrality of the system are critical for extending the continuous pHMD framework to the all-atom representation. The former is achieved here by adding forces to titration coordinates due to long-range electrostatics based on the generalized reaction field method, while the latter is made possible by a charge-leveling technique that couples proton titration with simultaneous ionization or neutralization of a co-ion in solution. We test the new method using the pH-replica-exchange CpHMD simulations of a series of aliphatic dicarboxylic acids with varying carbon chain length. The average absolute deviation from the experimental pKa values is merely 0.18 units. The results show that accounting for the forces due to extended electrostatics removes the large random noise in propagating titration coordinates, while maintaining charge neutrality of the system improves the accuracy in the calculated electrostatic interaction between ionizable sites. Thus, we believe that the way is paved for realizing pH-controlled all-atom molecular dynamics in the near future." @default.
• W2008174310 created "2016-06-24" @default.
• W2008174310 creator A5046050151 @default.
• W2008174310 creator A5084434392 @default.
• W2008174310 date "2012-11-14" @default.
• W2008174310 modified "2023-10-17" @default.
• W2008174310 title "Charge-leveling and proper treatment of long-range electrostatics in all-atom molecular dynamics at constant pH" @default.
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• W2008174310 doi "https://doi.org/10.1063/1.4766352" @default.
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• W2008174310 hasPublicationYear "2012" @default.
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