Oscillatory reaction induced periodic C-quadruplex dna gating of artificial ion channels

Jian Wang, Ruochen Fang, Jue Hou, Huacheng Zhang, Ye Tian, Huanting Wang, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

47 Citations (Scopus)

Abstract

Many biological ion channels controlled by biochemical reactions have autonomous and periodic gating functions, which play important roles in continuous mass transport and signal transmission in living systems. Inspired by these functional biological ion channel systems, here we report an artificial self-oscillating nanochannel system that can autonomously and periodically control its gating process under constant conditions. The system is constructed by integrating a chemical oscillator, consisting of BrO3 −, Fe(CN)6 4−, H+, and SO3 2−, into a synthetic protonsensitive nanochannel modified with C-quadruplex (C4) DNA motors. The chemical oscillator, containing H+-producing and H+-consuming reactions, can cyclically drive conformational changes of the C4-DNA motors on the channel wall between random coil and folded i-motif structures, thus leading to autonomous gating of the nanochannel between open and closed states. The autonomous gating processes are confirmed by periodic high−low ionic current oscillations of the channel monitored under constant reaction conditions. The utilization of a chemical oscillator integrated with DNA molecules represents a method to directly convert chemical energy of oscillating reactions to kinetic energy of conformational changes of the artificial nanochannels and even to achieve diverse autonomous gating functions in artificial nanofluidic devices.
Original languageEnglish
Pages (from-to)3022-3029
Number of pages8
JournalACS Nano
Volume11
Issue number3
DOIs
Publication statusPublished - 28 Mar 2017

Keywords

  • C-quadruplex DNA
  • gating
  • self-oscillating
  • conformational changes
  • artificial nanochannel

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