A program to calculate non-bonded interaction energy in biomolecular aggregates

Area of Science:

• Computational Chemistry
• Molecular Modeling
• Biophysics

Background:

• Accurate calculation of intermolecular and intramolecular electronic potential energy is crucial for understanding molecular interactions.
• Non-bonded interactions play a significant role in the structure and function of biomolecular assemblies.
• Existing methods may not fully capture non-additive effects important for cooperative phenomena.

Purpose of the Study:

• To present a computational program for calculating electronic potential energy from non-bonded interactions.
• To provide a tool for analyzing energy contributions in biomolecular systems.
• To incorporate non-additive dispersion effects for studying cooperative phenomena.

Main Methods:

• Application of Rayleigh-Schroedinger perturbation theory to non-overlapping molecular regions.
• Simplification of theoretical expressions using approximations common in semi-empirical molecular orbital theories.
• Development of a program to compute intermolecular and intramolecular energies.

Main Results:

• The program successfully calculates electronic potential energy arising from non-bonded interactions.
• It provides detailed insights into energy contributions from various interaction types.
• The inclusion of non-additive dispersion effects is demonstrated.

Conclusions:

• The developed program is a valuable tool for studying biomolecular assemblies.
• It offers a method to analyze cooperative phenomena by accounting for non-additive dispersion.
• The approach facilitates a deeper understanding of molecular interactions and energy components.