The Role of Quantum and Molecular Mechanics in Drug Design: Advanced Hybrid Techniques for Enhanced Therapeutic Precision.

The Quantum Mechanics/Molecular Mechanics (QM/MM) hybrid approach combines the accuracy of quantum mechanics with the computational efficiency of molecular mechanics, making it a powerful tool in drug design. This review discusses the QM/MM methodology, which applies quantum mechanics to active sites in biomolecules while using molecular mechanics to model their surrounding environment. This method has proven effective for studying enzyme reactions, ligand-protein interactions, and other critical processes in drug discovery. Key components such as QM and MM region partitioning, link atom schemes, and boundary treatments are reviewed, alongside recent advancements like polarizable force fields, enhanced sampling techniques, and integration with machine learning. Real-world applications, including virtual screening, lead optimization, and biochemical mechanism analysis, illustrate QM/MM's impact on designing effective therapeutics. As QM/MM technology continues to advance, its role in accelerating and refining drug discovery is expected to grow, bringing new possibilities to the field.