Halogens in Protein-Ligand Binding Mechanism: A Structural Perspective

Area of Science:

• Medicinal Chemistry
• Structural Biology
• Computational Chemistry

Background:

• Halogen atoms (F, Cl, Br, I) are key in drug design for tuning properties and selectivity.
• Halogen bonding and interactions via the σ-hole are well-studied, but other roles are less explored.

Purpose of the Study:

• To analyze the interacting environment of halogen atoms within protein-ligand complexes.
• To refine understanding of halogen interaction tendencies, considering protein data bank (PDB) redundancy.
• To discuss implications for rational drug design strategies involving halogens.

Main Methods:

• Analysis of protein-ligand complexes from the Protein Data Bank (PDB).
• Consideration of structural redundancy to refine interaction analysis.
• Review of quantum mechanics and statistical analyses of halogen interactions.

Main Results:

• Halogen bonding occurs moderately in protein-ligand complexes.
• Identified other significant roles of halogen atoms beyond halogen bonding.
• Refined understanding of halogen interaction preferences based on structural context.

Conclusions:

• Halogen bonding is not the sole important interaction for halogens in drug design.
• Medicinal chemists should consider diverse halogen interactions for rational drug design.
• This work provides a comprehensive guide to halogen interactions in protein-ligand systems.