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Title: Hybrid Pyridine–Pyridone Foldamer Channels as M2‐Like Artificial Proton Channels
Abstract

Currently, completely abiotic channel systems that concurrently reproduce the high selectivity and high permeation rate of natural protein channels are rare. Here, we provide one such biomimetic channel system, i.e., a novel family of helically folded hybrid amide foldamers that can serve as powerful artificial proton channels to mimic key transport features of the exceptionally selective Matrix‐2 (M2) proton channels. Possessing an angstrom‐scale tubular pore 3 Å in diameter, these low water permeability artificial channels transport protons at a rate 1.22 and 11 times as fast as gramicidin A and M2 channels, respectively, with exceptionally high selectivity factors of 167.6, 122.7, and 81.5 over Cl, Na+, and K+ions. Based on the experimental and computational findings, we propose a novel proton transport mechanism where a proton may create a channel‐spanning water chain from two or more short water chains to facilitate its own transmembrane flux via the Grotthuss mechanism.

 
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Award ID(s):
1710466 2205220
NSF-PAR ID:
10368519
Author(s) / Creator(s):
 ;  ;  ;  
Publisher / Repository:
Wiley Blackwell (John Wiley & Sons)
Date Published:
Journal Name:
Angewandte Chemie International Edition
Volume:
61
Issue:
28
ISSN:
1433-7851
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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