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2016 ; 12
(8
): 4138-45
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Adaptive Resolution Simulation of Supramolecular Water: The Concurrent Making,
Breaking, and Remaking of Water Bundles
#MMPMID27409519
Zavadlav J
; Marrink SJ
; Praprotnik M
J Chem Theory Comput
2016[Aug]; 12
(8
): 4138-45
PMID27409519
show ga
The adaptive resolution scheme (AdResS) is a multiscale molecular dynamics
simulation approach that can concurrently couple atomistic (AT) and
coarse-grained (CG) resolution regions, i.e., the molecules can freely adapt
their resolution according to their current position in the system. Coupling to
supramolecular CG models, where several molecules are represented as a single CG
bead, is challenging, but it provides higher computational gains and connection
to the established MARTINI CG force field. Difficulties that arise from such
coupling have been so far bypassed with bundled AT water models, where additional
harmonic bonds between oxygen atoms within a given supramolecular water bundle
are introduced. While these models simplify the supramolecular coupling, they
also cause in certain situations spurious artifacts, such as partial unfolding of
biomolecules. In this work, we present a new clustering algorithm SWINGER that
can concurrently make, break, and remake water bundles and in conjunction with
the AdResS permits the use of original AT water models. We apply our approach to
simulate a hybrid SPC/MARTINI water system and show that the essential properties
of water are correctly reproduced with respect to the standard monoscale
simulations. The developed hybrid water model can be used in biomolecular
simulations, where a significant speed up can be obtained without compromising
the accuracy of the AT water model.