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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

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An extensible interface for QM/MM molecular dynamics simulations with AMBER.

Andreas W Götz¹, Matthew A Clark, Ross C Walker

¹San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Drive, La Jolla, California, 92093-0505. agoetz@sdsc.edu.

Journal of Computational Chemistry

|October 15, 2013

Summary

We developed a new interface connecting AMBER molecular dynamics (MD) software with quantum mechanical (QM) methods. This enables advanced QM/MM MD simulations, enhancing computational chemistry research.

Keywords:

AMBER QM/MM ab initio calcium binding density functional theory molecular dynamics

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Area of Science:

Computational Chemistry
Molecular Dynamics
Quantum Mechanics

Background:

Molecular dynamics (MD) simulations are crucial for studying molecular behavior.
Integrating quantum mechanical (QM) methods with MD can provide higher accuracy for specific interactions.
Existing interfaces may lack extensibility or broad applicability.

Purpose of the Study:

To present an extensible interface between AMBER MD software and electronic structure packages.
To enable combined QM/MM MD simulations using various QM methods and embedding schemes.
To facilitate accurate simulations of molecular systems by combining classical and quantum mechanical approaches.

Main Methods:

Developed a modular interface connecting AMBER with QM software (e.g., for ab initio wave function theory, density functional theory).
Implemented data exchange via files, system calls, or message passing interface.
Utilized mechanical and electronic embedding schemes for QM/MM MD simulations.
Provided default settings for QM packages to ensure energy conservation in microcanonical ensemble simulations.

Main Results:

Demonstrated the interface's capability for QM/MM MD simulations within AMBER.
Verified energy conservation for QM/MM MD simulations in the microcanonical ensemble.
Presented results for the binding free energy of calcium ions to aspartate, comparing different QM Hamiltonians.

Conclusions:

The developed interface is extensible and portable, supporting diverse QM/MM MD simulations.
It allows the use of advanced QM methods within the AMBER framework.
The interface facilitates accurate computational studies of molecular systems, as shown by the binding energy calculations.