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      Electrostatics of Polymer Translocation Events in Electrolyte Solutions

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      Author(s)
      Buyukdagli, S.
      Ala-Nissila, T.
      Date
      2016
      Source Title
      Journal of Chemical Physics
      Print ISSN
      0021-9606
      Publisher
      American Institute of Physics Inc.
      Volume
      145
      Issue
      1
      Pages
      1 - 12
      Language
      English
      Type
      Article
      Item Usage Stats
      206
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      222
      downloads
      Abstract
      We develop an analytical theory that accounts for the image and surface charge interactions between a charged dielectric membrane and a DNA molecule translocating through the membrane. Translocation events through neutral carbon-based membranes are driven by a competition between the repulsive DNA-image-charge interactions and the attractive coupling between the DNA segments on the trans and the cis sides of the membrane. The latter effect is induced by the reduction of the coupling by the dielectric membrane. In strong salt solutions where the repulsive image-charge effects dominate the attractive trans-cis coupling, the DNA molecule encounters a translocation barrier of ∼10 kBT. In dilute electrolytes, the trans-cis coupling takes over image-charge forces and the membrane becomes a metastable attraction point that can trap translocating polymers over long time intervals. This mechanism can be used in translocation experiments in order to control DNA motion by tuning the salt concentration of the solution.
      Keywords
      Carbon
      DNA
      Electrolytes
      Molecules
      Polymers
      Analytical theory
      Charge interactions
      Dielectric membranes
      Electrolyte solutions
      Image charge force
      Image-charge effects
      Polymer translocation
      Salt concentration
      Membranes
      DNA
      Electrolyte
      Polymer
      Solution and solubility
      Algorithm
      Cell membrane
      Chemical model
      Chemistry
      Permeability
      Solution and solubility
      Static electricity
      Algorithms
      Cell Membrane
      DNA
      Electrolytes
      Models, Chemical
      Permeability
      Polymers
      Solutions
      Static Electricity
      Permalink
      http://hdl.handle.net/11693/36651
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.4954919
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      • Department of Physics 2550
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