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CHARMM-GUI PACE CG Builder for solution, micelle, and bilayer coarse-grained simulations.

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CHARMM-GUI PACE CG Builder simplifies creating complex biological simulations. This tool efficiently builds protein/micelle and protein/bilayer systems for multiscale modeling.

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Area of Science:

  • Computational biology
  • Biophysics
  • Molecular modeling

Background:

  • Coarse-grained (CG) and multiscale simulations are essential for studying large biological systems.
  • System preparation for multi-component biological models (e.g., protein/micelle, protein/bilayer) is often time-consuming.
  • Existing methods require careful arrangement of individual components.

Purpose of the Study:

  • To develop an automated tool for building multi-component biological simulation systems.
  • To enable efficient construction of solution, micelle, and bilayer systems using mixed united-atom (UA) and CG force fields.
  • To validate the accuracy and robustness of the developed builder.

Main Methods:

  • Development of CHARMM-GUI PACE CG Builder.
  • Utilized the PACE force field for proteins (UA model) and the Martini force field for lipids, water, and ions.
  • Validated the builder through simulations of diverse systems: proteins in solution, various micelles, and multiple types of lipid bilayers.

Main Results:

  • Successfully built and simulated multiple protein/micelle and protein/bilayer systems.
  • Simulation results for micelle radius of gyration, bilayer thickness, and per-lipid area were consistent with prior studies.
  • Root-mean squared deviations for most simulated proteins were below 3 Å, indicating good structural preservation.

Conclusions:

  • CHARMM-GUI PACE CG Builder is a robust and efficient tool for constructing complex biological simulation systems.
  • The tool facilitates mixed UA/CG modeling of large biological assemblies.
  • Expected to aid researchers in modeling and refining large, multi-component biological systems.