Hybrid QM-MM NAMD

Hybrid QM-MM NAMD performs hybrid quantum mechanics/molecular mechanics (QM/MM) simulations by coupling NAMD molecular dynamics and VMD analysis with quantum chemistry packages ORCA and MOPAC via QwikMD to study reaction mechanisms in enzyme active sites and large bioenergetic complexes.

Key Features:

• Integration via QwikMD: Links NAMD and VMD with ORCA and MOPAC to coordinate QM/MM calculations.
• NAMD QM extension: Extends NAMD functionality to include quantum mechanical regions within molecular dynamics simulations.
• Hybrid QM/MM simulations: Supports partitioning systems into QM and MM regions to combine quantum accuracy with molecular mechanics efficiency.
• Reaction mechanism analysis: Enables investigation of reaction mechanisms in enzyme active sites and large bioenergetic complexes.
• Visualization and analysis with VMD: Uses VMD for visualization and analysis of QM/MM trajectories and results.

Scientific Applications:

• Enzyme active site mechanisms: Study catalytic steps and electronic changes within enzyme active sites using QM/MM.
• Bioenergetic complex dynamics: Analyze reaction mechanisms and dynamics in large bioenergetic complexes.
• Atomic-resolution biomolecular dynamics: Provide atomic-resolution insights into biomolecular dynamic behavior through combined QM and MD approaches.

Methodology:

Hybrid QM/MM simulations using NAMD for molecular dynamics coupled to ORCA or MOPAC for quantum calculations, integrated via QwikMD and analyzed/visualized with VMD.