Molecular dynamics simulations elucidate oligosaccharide recognition pathways by galectin-3 at atomic resolution.

Area of Science:

• Biochemistry and Molecular Biology
• Structural Biology
• Computational Biology

Background:

• Lectins, like galectin-3, are crucial in cellular processes and cancer therapeutics due to their carbohydrate recognition.
• Galectin-3 specifically binds β-galactoside, but the dynamic mechanism of this recognition remains unclear.
• Understanding carbohydrate-lectin interactions is vital for developing targeted cancer therapies.

Purpose of the Study:

• To elucidate the atomic-level mechanism and dynamic process of human galectin-3 binding with N-acetyllactosamine (LacNAc).
• To investigate the real-time binding event and identify transient ligand poses during recognition.
• To understand the structure-activity relationship by analyzing ligand-target residence time.

Main Methods:

• Extensive Molecular Dynamics (MD) simulations were employed to model the complete binding event.
• Atomic precision analysis of the simulation trajectory captured the oligosaccharide diffusion and binding process.
• Kinetic analysis and residue-level examination were used to assess ligand-target interactions.

Main Results:

• MD simulations successfully captured the real-time binding of N-acetyllactosamine (LacNAc) to human galectin-3.
• The simulated bound pose accurately correlated with crystallographic data, confirming key stabilizing interactions.
• Ligand resilience against disassociation was identified as critical for the efficacy of active structural variants.

Conclusions:

• The study provides a detailed mechanistic insight into carbohydrate recognition by galectin-3 at the atomic level.
• The findings highlight the significance of ligand-target binary complex residence time in structure-activity relationships.
• This work advances the understanding of galectin-3's role in cellular processes and potential therapeutic targeting.