A Voltage‐Responsive Synthetic Cl−‐Channel Regulated by pH. (23rd September 2020)

• Record Type: Journal Article
• Authors: Zheng, Shao‐Ping; Jiang, Ji‐Jun; van der Lee, Arie; Barboiu, Mihail
• Is Part Of: Angewandte Chemie. Volume 132:Number 43(2020)
• Page Start: 19082
• Page End: 19088
• Publication Date: 2020-09-23
• Subjects: biomimetics -- H-bonding -- ion channels -- self-assembly -- water/Cl− wires; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202008393
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Transmembrane protein channels are an important inspiration for the design of artificial ion channels. Their dipolar structure helps overcome the high energy barrier to selectively translocate water and ions sharing one pathway, across the cell membrane. Herein, we report that the amino‐imidazole (Imu) amphiphiles self‐assemble via multiple H‐bonding to form stable artificial Cl − ‐channels within lipid bilayers. The alignment of water/Cl − wires influences the conduction of ions, envisioned to diffuse along the hydrophilic pathways; at acidic pH, Cl − /H + symport conducts along a partly protonated channel, while at basic pH, higher Cl − /OH − antiport translocate through a neutral channel configuration, which can be greatly activated by applying strong electric field. This voltage/pH regulated channel system represents an unexplored alternative for ion‐pumping along artificial ion‐channels, parallel to that of biology. Abstract : Voltage‐controlled translocation through chloride channels in bilayer membranes simultaneously regulated by pH is demonstrated. This voltage/pH regulated channel system represents an unexplored alternative for ion‐pumping along artificial ion‐channels.