AMBERff at Scale: Multimillion-Atom Simulations with AMBER Force Fields in NAMD.

Area of Science:

• Structural Biology
• Computational Biophysics
• Biomolecular Simulation

Background:

• All-atom molecular dynamics (MD) simulations are vital for understanding molecular motion in biological systems.
• Accurate force fields, like the AMBER family (AMBERff), are essential for reliable MD simulations.
• Current limitations hinder the simulation of large biological systems.

Purpose of the Study:

• To present a novel implementation of AMBERff for the NAMD simulation engine.
• To overcome previous limitations in simulating large-scale molecular systems.
• To enable high-performance, massively parallel simulations of up to two billion atoms.

Main Methods:

• Implementation of AMBERff within the NAMD simulation package.
• Utilized high-performance computing for massively parallel simulations.
• Performed single-point potential energy comparisons and case studies on model systems.

Main Results:

• The new implementation successfully integrates AMBERff into NAMD.
• Achieved high-performance, massively parallel simulations of systems up to two billion atoms.
• Demonstrated accuracy comparable to AMBERff's native engine.

Conclusions:

• The developed NAMD implementation of AMBERff overcomes previous limitations.
• Enables accurate and efficient simulation of exceptionally large biomolecular systems.
• Advances the capability of structural biology research using molecular dynamics.