title: Adaptive Resolution Simulation of Supramolecular Water: The Concurrent Making, Breaking, and Remaking of Water Bundles.
abstract: 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.
authors.affiliation: Department of Molecular Modeling, National Institute of Chemistry , Hajdrihova 19, SI-1001 Ljubljana, Slovenia.|Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana , Jadranska 19, SI-1000 Ljubljana, Slovenia.
authors.forename: Julija
authors.initials: J
authors.lastname: Zavadlav
authors.affiliation: Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen , Nijenborgh 7, 9747 AG Groningen, Netherlands.
authors.forename: Siewert J
authors.initials: SJ
authors.lastname: Marrink
authors.affiliation: Department of Molecular Modeling, National Institute of Chemistry , Hajdrihova 19, SI-1001 Ljubljana, Slovenia.|Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana , Jadranska 19, SI-1000 Ljubljana, Slovenia.
authors.forename: Matej
authors.initials: M
authors.lastname: Praprotnik