CHARMM-GUI HMMM Builder for Membrane Simulations with the Highly Mobile Membrane-Mimetic Model

Area of Science:

• Computational chemistry
• Biophysics
• Molecular dynamics simulations

Background:

• Conventional simulations struggle with slow lipid diffusion, hindering the study of membrane dynamics and protein interactions.
• The highly mobile membrane-mimetic (HMMM) model accelerates lipid motion by replacing lipid tails with small organic molecules.

Purpose of the Study:

• To develop CHARMM-GUI HMMM Builder for easy generation of HMMM simulation systems.
• To validate the HMMM Builder's capability in creating accurate HMMM membrane models.

Main Methods:

• Development of CHARMM-GUI HMMM Builder for automated input file generation.
• Simulation of various lipid-only and protein-lipid systems using the builder.
• Validation of HMMM model properties and advantages through simulations.

Main Results:

• CHARMM-GUI HMMM Builder successfully generates ready-to-go input files for HMMM membrane simulations.
• Simulations confirm accelerated lipid diffusion (1-2 orders of magnitude) and validate HMMM model properties.
• The builder supports diverse lipid types and includes conversion modules for HMMM and full-length membranes.

Conclusions:

• CHARMM-GUI HMMM Builder simplifies the setup of HMMM simulations, enhancing accessibility.
• The tool facilitates the study of membrane-protein associations and other phenomena requiring enhanced lipid diffusion.
• HMMM Builder is a valuable resource for researchers investigating complex membrane systems.