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Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
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A light-triggered transmembrane porin.

J Kahlstatt1, P Reiß, T Halbritter

  • 1Goethe University Frankfurt, Institute for Organic Chemistry and Chemical Biology, Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany. heckel@uni-frankfurt.de.

Chemical Communications (Cambridge, England)
|August 11, 2018
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Summary
This summary is machine-generated.

Researchers engineered the OmpG protein channel using photocaged molecules. Light-induced removal of these cages restored channel conductivity, demonstrating precise control over porin function.

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Area of Science:

  • Biophysics
  • Protein Engineering
  • Membrane Transport

Background:

  • Porins, such as OmpG, are transmembrane beta-barrels valuable for channel engineering.
  • OmpG is a robust, monomeric porin lacking inherent ion selectivity.
  • Engineering porin channels allows for the study and manipulation of transport processes.

Purpose of the Study:

  • To create a photocontrollable OmpG channel using a diethylaminocoumarin (DEACM) hybrid.
  • To investigate the effect of photocaged molecules on OmpG channel conductivity.
  • To demonstrate light-induced restoration of channel function.

Main Methods:

  • Genetic engineering of OmpG to incorporate photocaged DEACM groups.
  • Electrophysiological measurements to assess channel conductivity.
  • Photochemical uncaging using 385 nm irradiation.

Main Results:

  • Attachment of DEACM cages to the OmpG pore effectively blocked ion flow, confirmed by reduced conductivity.
  • Optimal pore blockage was achieved with two butyl-substituted coumarin cages inside the pore.
  • 385 nm light irradiation successfully removed the photocages, restoring OmpG channel conductivity.

Conclusions:

  • Photocaged DEACM is an effective tool for reversibly controlling OmpG channel function.
  • This engineered channel provides a model system for light-gated transport.
  • The study demonstrates precise spatiotemporal control over transmembrane channel activity.