RestraintMaker

RestraintMaker is a novel software program that enhances the accuracy and efficiency of calculating relative binding free energies (RBFE) in molecular simulations. This process is critical in computational chemistry and drug discovery, as it involves understanding how different molecules interact at an atomic level. The calculation of RBFE is complex, involving selecting a system representation (single or dual topology), a sampling approach, and a free-energy estimator. RestraintMaker introduces a systematic way to manage these calculations, mainly focusing on the dual-topology approach where molecules are simulated as separate entities. This method is noted for its ease of automation for high-throughput RBFE calculations.

The core functionality of RestraintMaker lies in its innovative use of a greedy algorithm to identify optimally (local optimum) distanced restraints between atom pairs based on geometric considerations. This feature is crucial for preventing the simulated molecules from drifting apart, thus significantly improving the sampling efficiency necessary for accurate RBFE calculations. Moreover, RestraintMaker extends its application to multi-state methods, such as enveloping distribution sampling (EDS) and multi-site lambda dynamics, broadening its utility in complex computational analyses.