Implementation and Testing of Multiple Walkers Approach Based Free Energy Calculations in the Grid Environment

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Publikace nespadá pod Ústav výpočetní techniky, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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STŘELCOVÁ Zora KULHÁNEK Petr KMUNÍČEK Jan KOČA Jaroslav MATYSKA Luděk

Rok publikování 2009
Druh Článek ve sborníku
Konference GCCP Proceedings
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Fyzikální chemie a teoretická chemie
Klíčová slova free energy; adaptive biasing force method; multiple walkers approach; pseudorotaxanes; molecular shuttle; cucurbit[n]urils; VOCE; MetaCentrum
Popis The calculation of free energy is a challenging task because it requires very long molecular simulations to obtain converged and reliable results. To overcome this so called sampling problem, several methods have been developed. In this work, Adaptive Biasing Force (ABF) method and Multiple Walkers Approach (MWA) are used in the study of molecular shuttle in pseudorotaxane complexes and water molecule transit through cucurbit[n]uril cavity. ABF method improves sampling by biasing system along a predefined reaction coordinate, which describes studied process. The sampling is further improved by MWA, which exchanges reconstructed free energy potential among several independent simulations (walkers) biased by ABF. Exchanges with all walkers need not be necessarily synchronized therefore it is possible to speed up the whole calculation in almost linear fashion. Due to this feature the combination of both methods is suitable for utilization within the production grid environment. Our tests were performed in the two distinct grid environments (VOCE and MetaCentrum ) and subsequently validated that MWA/ABF approach is promising tool benefiting from run in any Grid.
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