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CHARMM36 all-atom additive protein force field: Validation based on comparison to NMR data

Open access
Huang, Jing, MacKerell, Alexander D.·2013·Journal of Computational Chemistry

Abstract

Protein structure and dynamics can be characterized on the atomistic level with both nuclear magnetic resonance (NMR) experiments and molecular dynamics (MD) simulations. Here, we quantify the ability of the recently presented CHARMM36 (C36) force field (FF) to reproduce various NMR observables using MD simulations. The studied NMR properties include backbone scalar couplings across hydrogen bonds, residual dipolar couplings (RDCs) and relaxation order parameter, as well as scalar couplings, RDCs, and order parameters for side-chain amino- and methyl-containing groups. It is shown that the C36 FF leads to better correlation with experimental data compared to the CHARMM22/CMAP FF and suggest using C36 in protein simulations. Although both CHARMM FFs contains the same nonbond parameters, our results show how the changes in the internal parameters associated with the peptide backbone via CMAP and the χ1 and χ2 dihedral parameters leads to improved treatment of the analyzed nonbond interactions. This highlights the importance of proper treatment of the internal covalent components in modeling nonbond interactions with molecular mechanics FFs.

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Metadata

Authors
Huang, J., & MacKerell, A. D.
Venue
Journal of Computational Chemistry
Publisher
Wiley
Published
2013-07-06
Volume
34
Issue
25
Pages
2135-2145
ISSN
0192-8651 (ISSN-L)
OpenAlex
W2109154308
Cited by
4,430
References
4
FWCI
18.15
Type
journal article
Language
en
Open access
green

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