Using multistate free energy techniques to improve the efficiency of replica exchange accelerated molecular dynamics.

Using multistate free energy techniques to improve the efficiency of replica exchange accelerated molecular dynamics.
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DOI:
10.1002/jcc.21285
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发表时间:
2009-08
影响因子:
3
通讯作者:
McCammon, J. Andrew
McCammon, J. Andrew
中科院分区:
化学3区
文献类型:
--
作者:
Fajer, Mikolai;Swift, Robert V.;McCammon, J. Andrew

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Replica exchange accelerated molecular dynamics (REXAMD) is a method that enhances conformational sampling while retaining at least one replica on the original potential, thus avoiding the statistical problems of exponential reweighting. In this paper we study three methods that can combine the data from the accelerated replicas to enhance the estimate of properties on the original potential: weighted histogram analysis method (WHAM), pairwise multistate Bennett acceptance ratio (PBAR), and multistate Bennett acceptance ratio (MBAR). We show that the method that makes the most efficient use of equilibrium data from REXAMD simulations is the MBAR method. This observation holds for both alchemical free energy and structural observable prediction. The combination of REXAMD and MBAR should allow for more efficient scaling of the REXAMD method to larger biopolymer systems.
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