Creating Compartmentalized Pockets for Length-Tunable Short Peptide Growth.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomimetic Chemistry

Background:

• Living systems regulate macromolecular synthesis in enzyme pockets.
• Artificial nanoconfinement strategies exist but lack tunable, length-specific peptide growth.
• Reproducing enzyme-like spatial control in synthetic systems is a key challenge.

Purpose of the Study:

• To develop a stable metal-organic framework (MOF) platform for controlled peptide synthesis.
• To achieve tunable and length-specific growth of short peptides using confined polymerization.
• To explore the potential of MOFs in biomimetic catalysis and functional material design.

Main Methods:

• Utilized a stable metal-organic framework (MOF) as a platform for N-carboxyanhydride (NCA) ring-opening polymerization (ROP).
• Investigated reaction kinetics and employed Nuclear Magnetic Resonance (NMR) spectroscopy to analyze the confined oligomerization process within MOF channels.
• Manipulated monomer size, reaction kinetics, and amino acid pre-coordination to control peptide chain length and sequence.

Main Results:

• Demonstrated confined NCA-ROP within MOF channels, yielding length-selective short peptide growth.
• Achieved significantly higher peptide loading and chain-length selectivity compared to unconfined polymerization.
• Observed a >30-fold acceleration in NCA-ROP by pre-coordinating amino acids at Zr6 clusters.
• Successfully synthesized sequence-specific A-(B)n peptides by selecting appropriate monomers.

Conclusions:

• Established a robust MOF-based platform for biomimetic peptide synthesis, mimicking natural biosynthetic machinery.
• Advanced the understanding of confined oligomerization and polymerization kinetics within defined nanospace.
• Provided a versatile platform for creating functional peptide-MOF materials with potential applications in catalysis.