Nuclear magnetic resonance free ligand conformations and atomic resolution dynamics

Area of Science:

• Computational chemistry
• Molecular dynamics
• Drug discovery

Background:

• Knowledge of small molecule conformational preferences and dynamics is crucial for effective drug design.
• Ranking potential drug candidates requires understanding energy minima and rotational energy barriers.

Purpose of the Study:

• To assess the utility of replica exchange with solute tempering molecular dynamics (REST-MD) for analyzing free ligand conformational dynamics.
• To validate computational predictions of rotational energy barriers against experimental data.

Main Methods:

• Replica exchange with solute tempering molecular dynamics (REST-MD) simulations were performed.
• Conformational preferences and rotational energy barriers were calculated for small molecules.
• Results were compared with experimental high-resolution $$H nuclear magnetic resonance (NMR) data.

Main Results:

• REST-MD simulations provided insights into conformational exchange dynamics.
• Calculated rotational energy barriers showed good agreement with experimental NMR values.
• The in-silico method proved relevant for ranking drug design ideas across analog series.

Conclusions:

• REST-MD is a valuable computational tool for understanding small molecule dynamics in solution.
• Accurate prediction of rotational energy barriers aids in prioritizing drug design hypotheses.
• This approach efficiently guides rational drug discovery towards promising molecular candidates.