Molecular tweezers target a protein-protein interface and thereby modulate complex formation

Area of Science:

• Biochemistry
• Chemical Biology
• Structural Biology

Background:

• Protein-protein interactions (PPIs) are vital for cellular functions.
• Disrupting specific PPIs is a key therapeutic strategy.
• Targeting amino acid residues like lysine and arginine offers specific binding opportunities.

Purpose of the Study:

• To develop and characterize molecular tweezers for targeting specific amino acid residues.
• To investigate the mechanism by which molecular tweezers disrupt protein-protein interactions.
• To demonstrate the utility of these tweezers in a biological context.

Main Methods:

• Nuclear Magnetic Resonance (NMR) spectroscopy for structural elucidation.
• Quantum Mechanics/Molecular Mechanics (QM/MM) calculations for computational insights.
• Isothermal Titration Calorimetry (ITC), fluorescence anisotropy, ELISA, and bio-layer interferometry for binding and interaction studies.

Main Results:

• Molecular tweezers were designed to selectively bind lysine and arginine residues on protein surfaces.
• The unique complexation mode of the tweezers effectively disrupted a critical protein-protein interaction.
• Detailed structural and thermodynamic data confirmed the binding and inhibitory mechanism.

Conclusions:

• Molecular tweezers represent a promising strategy for modulating protein-protein interactions.
• The study provides a detailed mechanistic understanding of how these tweezers function.
• This approach offers potential for developing novel therapeutics targeting PPIs.