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Size-dependent interaction of a 3-arm star poly(ethylene glycol) with two biological nanopores

  • Monasadat Talarimoghari
  • Gerhard Baaken
  • Ralf Hanselmann
  • Jan C. Behrends
Regular Article
  • 33 Downloads
Part of the following topical collections:
  1. Polymers: From Adsorption to Translocation - Topical Issue in Memoriam Loïc Auvray (1956-2016)

Abstract.

We use two pore-forming proteins, alpha-hemolysin and aerolysin, to compare the polymer size-dependence of ionic current block by two types of ethyleneglycol polymers: 1) linear and 2) 3-arm star poly(ethylene glycol), both applied as a polydisperse mixture of average mass 1kDa under high salt conditions. The results demonstrate that monomer size sensitivity, as known for linear PEGs, is conserved for the star polymers with only subtle differences in the dependence of the residual conductance on monomer number. To explain this absence of a dominant effect of polymer architecture, we propose that PEG adsorbs to the inner pore wall in a collapsed, salted-out state, likely due to the effect of hydrophobic residues in the pore wall on the availability of water for hydration.

Graphical abstract

Keywords

Polymers: From Adsorption to Translocation - Topical Issue in Memoriam Loïc Auvray (1956-2016) 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Monasadat Talarimoghari
    • 1
  • Gerhard Baaken
    • 2
  • Ralf Hanselmann
    • 3
    • 4
  • Jan C. Behrends
    • 1
    • 4
    • 5
  1. 1.Laboratory for Membrane Physiology and Technology, Department of Physiology, Faculty of MedicineUniversity of FreiburgFreiburgGermany
  2. 2.Ionera Technologies GmbHFreiburgGermany
  3. 3.Institute for Macromolecular ChemistryFreiburgGermany
  4. 4.Freiburg Materials Research CentreUniversity of FreiburgFreiburgGermany
  5. 5.Freiburg Centre for Interactive Materials and Bioinspired TechnologiesUniversity of FreiburgFreiburgGermany

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