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Multiple-replica strategies for free-energy calculations in NAMD: Multiple-walker adaptive biasing force and walker selection rules. From the most powerful supercomputers to multicore desktops and laptops, parallel computing architectures have been in the mainstream for some time. However, numerical schemes for calculating free energies in molecular systems that directly leverage this hardware paradigm, usually taking the form of multiple-replica strategies, are just now on the cusp of becoming standard practice. Here, we present a modification of the popular molecular dynamics program NAMD that is envisioned to facilitate the use of powerful multiple-replica strategies to improve ergodic sampling for a specific class of free-energy methods known as adaptive biasing force. We describe the software implementation in a so-called multiple-walker context, alongside the interface that makes the proposed approach accessible to the end users. We further evaluate the performance of the adaptive biasing force multiple-walker strategy for a model system, namely, the reversible folding of a short peptide, and show, in particular, in regions of the transition coordinate where convergence of the free-energy calculation is encumbered by hidden barriers, that the multiple-walker strategy can yield far more reliable results in appreciably less real time on parallel architectures, relative to standard, single-replica calculations. Journal of Chemical Theory and Computation, 2015.

Recent publications

Bignon, E.; Gattuso, H.; Morell, C.; Dehez, F.; Georgakilas, A. G.; Monari, A. & Dumont, E.
Correlation of bistranded clustered abasic DNA lesion processing with structural and dynamic DNA helix distortion.
Nucleic Acids Res.

2016,  (44), 8588-8599.
dx.doi.org

Wang, S.; Zhao, T.; Shao, X.; Chipot, C.; Cai, W.
Complex movements in rotaxanes: Shuttling coupled with conformational transition of cyclodextrins
J. Phys. Chem. C

2016,  (120), 19479-19486.
dx.doi.org

Gattuso, H.; Durand, E.; Bignon, E.; Morell, C.; Georgakilas, A. G.; Dumont, E.; Chipot, C.; Dehez, F.; Monari, A.
Repair rate of clustered abasic DNA lesions by human endonuclease: Molecular bases of sequence specificity
J. Phys. Chem. Lett

2016,  (19), 3760-3765.
dx.doi.org

News

- Renewal of the Laboratoire International Associé CNRS-University of Illinois at Urbana-Champaign on November 2016
- An update of ParseFEP is available in the latest version of VMD.
- 新的分子动力学讲义 (Dissemination).
 

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