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    Comparing the Ability of Enhanced Sampling Molecular Dynamics Methods to Reproduce the Behavior of Fluorescent Labels on Proteins

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    Fulltext not available
    Authors
    Walczewska-Szewc, K.
    Deplazes, Evelyne
    Corry, B.
    Date
    2015
    Type
    Journal Article
    
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    Citation
    Walczewska-Szewc, K. and Deplazes, E. and Corry, B. 2015. Comparing the Ability of Enhanced Sampling Molecular Dynamics Methods to Reproduce the Behavior of Fluorescent Labels on Proteins. Journal of Chemical Theory and Computation. 11 (7): pp. 3455-3465.
    Source Title
    Journal of Chemical Theory and Computation
    DOI
    10.1021/acs.jctc.5b00205
    ISSN
    1549-9618
    School
    School of Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/17950
    Collection
    • Curtin Research Publications
    Abstract

    Adequately sampling the large number of conformations accessible to proteins and other macromolecules is one of the central challenges in molecular dynamics (MD) simulations; this activity can be difficult, even for relatively simple systems. An example where this problem arises is in the simulation of dye-labeled proteins, which are now being widely used in the design and interpretation of Förster resonance energy transfer (FRET) experiments. In this study, MD simulations are used to characterize the motion of two commonly used FRET dyes attached to an immobilized chain of polyproline. Even in this simple system, the dyes exhibit complex behavior that is a mixture of fast and slow motions. Consequently, very long MD simulations are required to sufficiently sample the entire range of dye motion. Here, we compare the ability of enhanced sampling methods to reproduce the behavior of fluorescent labels on proteins. In particular, we compared Accelerated Molecular Dynamics (AMD), metadynamics, Replica Exchange Molecular Dynamics (REMD), and High Temperature Molecular Dynamics (HTMD) to equilibrium MD simulations. We find that, in our system, all of these methods improve the sampling of the dye motion, but the most significant improvement is achieved using REMD.

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