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Selection of Transporter-Targeted Inhibitory Nanobodies by Solid-Supported-Membrane SSM-Based Electrophysiology
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pH switchable anion transport by an oxothiosquaramide.

Robert B P Elmes1, Nathalie Busschaert, Dawid D Czech

  • 1School of Chemistry (F11), The University of Sydney, 2006 NSW, Australia. kate.jolliffe@sydney.edu.au.

Chemical Communications (Cambridge, England)
|May 23, 2015
PubMed
Summary

An oxothiosquaramide binds chloride via hydrogen bonds. This molecule facilitates pH-dependent chloride transport across cell membranes using an antiport mechanism.

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Area of Science:

  • Chemical Biology
  • Membrane Transport
  • Supramolecular Chemistry

Background:

  • Chloride ions play crucial roles in cellular physiology.
  • Developing synthetic molecules for controlled ion transport is an active research area.
  • Understanding molecular mechanisms of ion transport across lipid bilayers is essential.

Purpose of the Study:

  • To investigate the chloride binding properties of an oxothiosquaramide derivative.
  • To explore the potential of this molecule in facilitating chloride transport across phospholipid bilayers.
  • To elucidate the mechanism of pH-dependent ion transport mediated by the synthetic molecule.

Main Methods:

  • Synthesis and characterization of the oxothiosquaramide.
  • Binding studies using hydrogen bonding interactions in DMSO.
  • Phospholipid bilayer experiments to assess chloride transport.
  • pH-dependent transport assays to determine switchable activity.
  • Analysis of the transport mechanism, identifying it as antiport.

Main Results:

  • The oxothiosquaramide demonstrated specific binding to chloride ions through hydrogen bonding in DMSO.
  • The molecule successfully mediated chloride transport across phospholipid bilayers.
  • Chloride transport was found to be pH-switchable, indicating tunable activity.
  • The transport mechanism was identified as an antiport process, involving counter-transport of ions.

Conclusions:

  • Oxothiosquaramide is a promising synthetic receptor for chloride ions.
  • The molecule exhibits pH-switchable chloride transport capabilities across lipid membranes.
  • The antiport mechanism highlights the potential for developing novel ion-transporting systems.