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High Resolution Physical Characterization of Single Metallic Nanoparticles
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Structural and functional characterization of a synthetically modified OmpG.

Wolfgang Grosse1, Philipp Reiss, Simon Reitz

  • 1Philipps-Universität Marburg, Fachbereich Chemie, Hans-Meerwein-Straße, 35032 Marburg, Germany.

Bioorganic & Medicinal Chemistry
|April 10, 2010
PubMed
Summary

Outer membrane protein OmpG was chemically modified for stochastic sensing applications. The resulting OmpG-dansyl hybrid showed partial current blockage, confirming OmpG

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Nanotechnology

Background:

  • Chemical modification of ion channels is a promising area for stochastic sensing and neurobiology.
  • Stable β-barrel proteins, like outer membrane protein OmpG, offer potential for extensive chemical modification due to their wide pores.

Purpose of the Study:

  • To create and characterize ion-channel hybrids using the outer membrane protein OmpG.
  • To assess the suitability of OmpG as a platform for developing stochastic sensors.

Main Methods:

  • Generation of OmpG-dansyl hybrid through S-alkylation with a synthetic modulator.
  • Functional characterization of the hybrid's current and gating properties.
  • Structural determination of the OmpG-dansyl hybrid using X-ray crystallography at 2.4Å resolution.

Main Results:

  • The OmpG-dansyl hybrid exhibited partial blockage of ion current.
  • The OmpG channel's gating characteristics remained largely unaffected by the modification.
  • Crystal structure revealed the dansyl modulator lines the inner pore wall of OmpG.

Conclusions:

  • Outer membrane protein OmpG is a suitable structural base for constructing stochastic sensors.
  • Chemical modification of OmpG can modulate its pore properties for sensing applications.