Empirical hydrogen-bond potential functions--an old hat reconditioned

Area of Science:

• Computational chemistry
• Biophysics
• Molecular modeling

Background:

• Accurate description of hydrogen bonds is critical for computational modeling of biological systems.
• Standard force field (FF) and semiempirical quantum mechanical (SQM) methods struggle with precise hydrogen bond representation.
• Empirical hydrogen bond correction terms can substantially enhance SQM method performance.

Purpose of the Study:

• To review recent advancements in hydrogen bond terms for FF and SQM methods.
• To investigate the impact of angular and torsional information on hydrogen bond accuracy.
• To introduce a reduced DH(+) model for FF methods and protein-ligand scoring.

Main Methods:

• Review of existing FF and SQM hydrogen bond correction terms.
• Analysis of angular and torsional geometric parameters in hydrogen bonding.
• Development and application of a reduced DH(+) model with a modified UFF force field.

Main Results:

• A complete geometric description, including angular and torsional data, is essential for accurate hydrogen bonding.
• The reduced DH(+) model significantly improves accuracy for non-covalent interactions in FF methods.
• Accuracy gains exceeding one order of magnitude were observed for non-covalent interactions.

Conclusions:

• Incorporating detailed geometric information enhances hydrogen bond accuracy in computational models.
• The developed DH(+) model offers a promising approach for improving FF-based simulations and scoring functions.
• Further research into geometric descriptors can lead to more reliable molecular modeling techniques.