Detection of DNA molecules in a lipid nanotube channel in the low ion strength conditions

K. V. Chekashkina; T. R. Galimzyanov; P. I. Kuzmin; S. A. Akimov; S. A. Romanov; G. E. Pozmogova; D. V. Klinov; P. V. Bashkirov

doi:10.1134/S1990747817030047

Detection of DNA molecules in a lipid nanotube channel in the low ion strength conditions

Authors: Chekashkina K.V.¹^,2, Galimzyanov T.R.²^,3, Kuzmin P.I.², Akimov S.A.²^,3, Romanov S.A.¹^,2^,4, Pozmogova G.E.¹, Klinov D.V.¹, Bashkirov P.V.¹^,2
Affiliations:
1. Federal Research and Clinical Center of Physical-Chemical Medicine
2. Frumkin Institute of Physical Chemistry and Electrochemistry
3. National University of Science and Technology MISiS
4. Moscow Institute of Physics and Technology
Issue: Vol 11, No 3 (2017)
Pages: 217-224
Section: Articles
URL: https://journals.rcsi.science/1990-7478/article/view/213254
DOI: https://doi.org/10.1134/S1990747817030047
ID: 213254

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Abstract

Investigation of the transport phenomena in the nanoscopic channels/pores with the diameter smaller than 100 nm is of utmost importance for various biological, medical, and technical applications. Presently, the main line of development of nanofluidics is creation of biosensors capable of detecting single molecules and manipulating them. Detection of molecules is based on the measurement of electric current through a channel of appropriate size: when the molecule enters the channel, which diameter is comparable with the molecule size, the ion current reduces. In order to improve transport properties of such channels, their walls are often coated with a lipid bilayer, which behaves as two-dimensional liquid and thus is capable of supporting transport phenomena. In the present work, we utilized this property of lipid membranes for the development of a method for detecting and controlling transport of single-stranded DNA through channels formed by membrane cylinders with the luminal radii of 5–7 nm. We have demonstrated that in the conditions of small ion strength, the appearance of a DNA molecule inside such channel is accompanied by an increase of its ion conductivity and can be controlled by the polarity of the applied voltage. The amplitude of the ion current increase allows evaluating the amount of DNA molecules inside the channels. It was also demonstrated that upon adsorption of DNA molecules on the lipid bilayer surface, the membrane cylinder behaves as a voltage-sensitive selective ion channel.

Keywords

lipid bilayer, membrane nanotubes, ion selectivity, electrokinetic phenomena

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Detection of DNA molecules in a lipid nanotube channel in the low ion strength conditions

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Abstract

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About the authors

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