Highly Efficient Artificial Potassium Ion Channels Constructed via Supramolecular Cooperativity

Area of Science:

• Biomimetic chemistry
• Supramolecular chemistry
• Nanotechnology

Background:

• Biological ion channels are crucial for cellular function and implicated in various diseases.
• Artificial ion channels offer potential therapeutic solutions for ion channelopathies.
• Previous work established artificial potassium channels, necessitating further optimization.

Purpose of the Study:

• To design and synthesize novel biomimetic potassium (K+) channels.
• To enhance molecular assembly and ion selectivity using directional supramolecular interactions.
• To investigate the structure-property relationships governing artificial ion channel efficiency.

Main Methods:

• Incorporation of π stacking and hydrogen bonding for directional supramolecular interactions.
• Design of aromatic helix-based structures with a precise pore size (2.7 Å).
• Evaluation of K+ selectivity and transport activity using established experimental conditions.

Main Results:

• Developed artificial K+ channels exhibiting remarkable K+ selectivity.
• Achieved a K+/Na+ selectivity ratio of 37.8, reaching 48% of the KcsA channel.
• Demonstrated high potassium ion transport activity (EC50 as low as 6.4 nM), surpassing existing artificial channels.
• Identified nanopore preorganization and supramolecular cooperativity as critical for efficiency.

Conclusions:

• Supramolecular cooperativity, particularly via hydrogen bonding, significantly enhances ion transport activity (5-fold increase).
• The study presents a fundamental supramolecular strategy for designing highly efficient artificial ion channels.
• These findings pave the way for advanced applications in treating ion channelopathies.