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Ion Channels Made from a Single Membrane-Spanning DNA Duplex.

Kerstin Göpfrich1, Chen-Yu Li2, Iwona Mames3

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Researchers created a simple DNA-based ion channel that spans cell membranes. This novel channel facilitates ion conduction through a DNA-lipid interface, mimicking natural ion channels.

Keywords:
DNA nanotechnologylipid membranemolecular dynamicsporphyrinsynthetic ion channel

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biophysics
  • Nanotechnology

Background:

  • Transmembrane channels facilitate ion transport across cell membranes, crucial for cellular functions.
  • Existing protein channels and synthetic pores often involve complex structures for ion conduction.

Purpose of the Study:

  • To demonstrate ion conduction through a DNA duplex lacking a hollow interior.
  • To elucidate the mechanism of ion transport at the DNA-lipid interface.
  • To develop a simplified, DNA-based synthetic ion channel.

Main Methods:

  • Design and synthesis of a DNA duplex tagged with porphyrin molecules to span lipid membranes.
  • Electrophysiology measurements to record ion current.
  • All-atom molecular dynamics simulations to analyze the ion conduction pathway at the molecular level.

Main Results:

  • A single DNA duplex, despite lacking a central hollow channel, induced ion conduction across lipid membranes.
  • Ion flow occurred at the DNA-lipid interface, driven by lipid head group tilting to form a toroidal pore.
  • The DNA-lipid channel exhibited characteristics of natural channels, including insertion, closure, and gating.
  • Experimental and simulation results for ionic conductance showed excellent quantitative agreement.

Conclusions:

  • A novel, highly simplified DNA-based ion channel mechanism was demonstrated.
  • This approach offers a pathway for designing new synthetic ion channels with maximum simplicity.
  • The findings highlight the potential of DNA nanotechnology in creating functional biomimetic systems.