Modelling flexible protein-ligand binding in p38α MAP kinase using the QUBE force field

Area of Science:

• Computational chemistry
• Molecular modeling
• Drug discovery

Background:

• p38α MAP kinase is a key target in inflammatory diseases.
• Accurate calculation of binding free energies is crucial for drug discovery.
• Developing reliable computational methods for flexible molecules is challenging.

Purpose of the Study:

• To evaluate the quantum mechanical bespoke (QUBE) force field for calculating relative binding free energies.
• To test the QUBE force field's performance with flexible inhibitors of p38α MAP kinase.
• To assess the potential of quantum mechanics-derived force fields in drug discovery.

Main Methods:

• Retrospective calculation of relative binding free energies using the QUBE force field.
• Application to a series of 17 flexible inhibitors of p38α MAP kinase.
• Utilized enhanced sampling techniques to mitigate starting structure dependence.

Main Results:

• The QUBE force field achieved competitive accuracy compared to a widely-used biological force field.
• The calculations demonstrated the QUBE force field's capability with flexible and relatively large molecules.
• Enhanced sampling was necessary for reliable results with these complex systems.

Conclusions:

• Quantum mechanics-derived force fields, like QUBE, are nearing the accuracy needed for prospective drug discovery.
• The QUBE force field shows potential as a valuable tool in guiding the design of new kinase inhibitors.
• Further development and validation of QM-derived force fields are warranted for broader application in pharmaceutical research.