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Martini 3 Coarse-Grained Force Field for Carbohydrates.

Fabian Grünewald1, Mats H Punt1, Elizabeth E Jefferys2

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The Martini 3 force field now accurately models carbohydrates using a novel fragment-based approach. This enhanced biomolecular simulation method improves descriptions of solubility and membrane interactions.

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Area of Science:

  • Computational chemistry
  • Biomolecular simulations
  • Coarse-grained modeling

Background:

  • The Martini 3 force field offers improved accuracy for condensed phase systems.
  • Accurate parametrization of diverse molecules is crucial for biomolecular simulations.

Purpose of the Study:

  • To develop a consistent and accurate strategy for parametrizing carbohydrate molecules within the Martini 3 force field.
  • To enable more precise simulation of carbohydrate behavior in various environments.

Main Methods:

  • Developed a canonical mapping scheme to decompose carbohydrates into limited fragments.
  • Assigned bead types by matching physicochemical properties of mono- and disaccharides.
  • Established guidelines for bonds, angles, and dihedrals to improve conformational accuracy.

Main Results:

  • Accurately reproduced osmotic pressures of carbohydrate-water solutions.
  • Correctly differentiated the solubility of dextran and cellulose.
  • Successfully applied new building blocks to glycolipids, reproducing membrane properties and protein binding.

Conclusions:

  • The developed Martini 3 parametrization strategy provides accurate and transferable models for carbohydrates.
  • This approach enhances the simulation of carbohydrate-related systems, including glycolipids and their interactions.
  • The findings validate the utility of the new building blocks for biomolecular modeling.