Synthesis of Cyclic Megamolecules

Area of Science:

• Macromolecular chemistry
• Supramolecular chemistry
• Bioconjugation chemistry

Background:

• Giant cyclic molecules with nanoscale dimensions are challenging to synthesize.
• Protein engineering offers unique building blocks for macromolecular assembly.
• Controlled chemical ligation is essential for constructing complex architectures.

Purpose of the Study:

• To develop an efficient method for synthesizing giant cyclic macromolecules (10-20 nm in diameter).
• To utilize fusion proteins with orthogonal reactive domains for controlled assembly.
• To investigate the kinetics of macrocycle formation.

Main Methods:

• Employing a fusion protein with N-terminal cutinase and C-terminal SnapTag domains.
• Utilizing small molecule linkers with irreversible inhibitors (p-nitrophenyl phosphonate and benzylguanine).
• Sequential ligation to form linear structures followed by cyclization.

Main Results:

• Successful synthesis of cyclic macromolecules with diameters of 10-20 nm.
• Quantification of cyclization rate constants for dimer, tetramer, and hexamer formation.
• Demonstration of an efficient route to nanoscale cyclic scaffolds.

Conclusions:

• The megamolecule approach provides a versatile strategy for creating large cyclic structures.
• This method enables the generation of novel nanoscale scaffolds with potential applications in materials science and nanotechnology.
• The study establishes a robust synthetic route for complex macromolecular architectures.