Host Dynamics under General-Purpose Force Fields

Area of Science:

• Computational Chemistry
• Molecular Modeling
• Supramolecular Chemistry

Background:

• Macrocyclic hosts are vital in pharmaceutical research for binding gaseous and drug-like guests.
• Accurate modeling of host-guest interactions requires a balanced understanding of host dynamics and various interaction terms.
• Current general-purpose force fields lack detailed understanding for macrocycle host-guest systems.

Purpose of the Study:

• To comprehensively profile the energetics and dynamics of four popular macrocycle types: cucurbiturils, pillararenes, cyclodextrins, and octa acids.
• To investigate the impact of force field definitions, refitting, and evaluations on host-guest modeling.
• To address the gap in understanding force field performance for macrocyclic host-guest systems.

Main Methods:

• Detailed investigation of force field definitions for selected macrocycles.
• Force field refitting and evaluation protocols.
• Analysis of host dynamics and energetics in host-guest complexation.

Main Results:

• Unprecedentedly detailed investigations of force field parameters for cucurbiturils, pillararenes, cyclodextrins, and octa acids.
• Identification of key factors influencing host dynamics and energetics.
• Insights into the performance of commonly used general-purpose force fields.

Conclusions:

• A balanced description of interacting terms is indispensable for accurate host-guest modeling.
• The study provides valuable observations and explanations for force field selection.
• General guidelines for force field parametrization and selection in host-guest modeling are summarized.