A double-decker cage for allosteric encapsulation of ATP

Area of Science:

• Supramolecular Chemistry
• Host-Guest Chemistry
• Molecular Recognition

Background:

• Designing synthetic hosts for selective guest binding is a significant challenge in supramolecular chemistry.
• Adenosine triphosphate (ATP) is a crucial biomolecule, and its controlled sequestration is of interest for various applications.
• Understanding host-guest interactions at the molecular level is key to developing advanced functional materials.

Purpose of the Study:

• To synthesize and characterize a novel double-decker cage molecule with predefined binding sites.
• To investigate the host-guest complexation of adenosine triphosphate (ATP) within the designed cage.
• To elucidate the binding mechanism and driving forces for ATP encapsulation.

Main Methods:

• Synthesis and characterization of the double-decker cage ([1-H6]6+).
• Binding studies using techniques such as Nuclear Magnetic Resonance (NMR) spectroscopy.
• Computational modeling and theoretical calculations to understand interaction energies and binding modes.

Main Results:

• Successful preparation of the [1-H6]6+ double-decker cage featuring two distinct binding pockets.
• Demonstration of high-affinity, allosteric binding of two ATP molecules within the cage.
• Experimental and theoretical evidence for the crucial roles of charged hydrogen bonds and pi-pi stacking interactions in the encapsulation process.

Conclusions:

• The novel double-decker cage exhibits remarkable efficiency in encapsulating two ATP molecules.
• The synergistic interplay between hydrogen bonding and pi-pi stacking is identified as the primary driving force for guest binding.
• This work provides a new platform for the design of sophisticated host molecules for specific biological targets.