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An Autonomously Reciprocating Transmembrane Nanoactuator
Author(s) -
Watson Matthew A.,
Cockroft Scott L.
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201508845
Subject(s) - reciprocating motion , molecular machine , nanopore , dissipative system , transmembrane protein , membrane , biological system , coupling (piping) , biophysics , supramolecular chemistry , nanotechnology , chemistry , chemical physics , materials science , computer science , molecule , physics , artificial intelligence , thermodynamics , biochemistry , metallurgy , organic chemistry , receptor , bearing (navigation) , biology
Biological molecular machines operate far from equilibrium by coupling chemical potential to repeated cycles of dissipative nanomechanical motion. This principle has been exploited in supramolecular systems that exhibit true machine behavior in solution and on surfaces. However, designed membrane‐spanning assemblies developed to date have been limited to simple switches or stochastic shuttles, and true machine behavior has remained elusive. Herein, we present a transmembrane nanoactuator that turns over chemical fuel to drive autonomous reciprocating (back‐and‐forth) nanomechanical motion. Ratcheted reciprocating motion of a DNA/PEG copolymer threaded through a single α‐hemolysin pore was induced by a combination of DNA strand displacement processes and enzyme‐catalyzed reactions. Ion‐current recordings revealed saw‐tooth patterns, indicating that the assemblies operated in autonomous, asymmetric cycles of conformational change at rates of up to one cycle per minute.