Publication

Capturing Choline–Aromatics Cation−π Interactions in the MARTINI Force Field

Khan, H. M., Telles de Souza, P. C., Thallmair, S., Barnoud, J., De Vries, A. H., Marrink, S. J. & Reuter, N., May-2020, In : Journal of Chemical Theory and Computation. 16, 4, p. 2550-2560 11 p.

Research output: Contribution to journalArticleAcademicpeer-review

Cation-π interactions play an important role in biomolecular recognition including interactions between membrane phosphatidylcholine lipids and aromatic amino acids of peripheral proteins. While molecular mechanics coarse grain (CG) force fields are particularly well suited to simulate membrane proteins in general, they are not parameterized to explicitly reproduce cation-π interactions. We here propose a modification of the polarizable MARTINI coarse grain (CG) model enabling it to model membrane binding events of peripheral proteins whose aromatic amino acid interactions with choline headgroups are crucial for their membrane binding. For this purpose we first collected and curated a dataset of eight peripheral proteins from different families. We find that the MARTINI CG model expectedly underestimates aromatics-choline interactions and is unable to reproduce membrane binding of the peripheral proteins in our dataset. Adjustments of the relevant interactions in the polarizable MARTINI force field yield significant improvements in the observed binding events. The orientation of each membrane-bound protein is comparable to reference data from all-atom simulations and experimental binding data. We also use negative controls to ensure that choline-aromatics interactions are not overestimated. We finally check that membrane properties, transmembrane proteins and membrane translocation PMF of aromatic amino acid side-chain analogues are not affected by the new parameter set. This new version "MARTINI 2.3P" is a significant improvement over its predecessors and is suitable for modeling membrane proteins including peripheral membrane binding of peptides and proteins.

Original languageEnglish
Pages (from-to)2550-2560
Number of pages11
JournalJournal of Chemical Theory and Computation
Volume16
Issue number4
Early online date25-Feb-2020
Publication statusPublished - May-2020

    Keywords

  • MEMBRANE-PROTEIN INTERACTIONS, PLECKSTRIN HOMOLOGY DOMAINS, COARSE-GRAINED MODEL, MOLECULAR-DYNAMICS, COUPLED RECEPTORS, PHOSPHOLIPASE-C, HIGH-THROUGHPUT, EQUINATOXIN-II, BINDING-SITE, AMINO-ACIDS

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