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Related Concept Videos

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Related Experiment Video

Updated: Jun 25, 2026

Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
08:39

Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins

Published on: May 22, 2017

Rhodopsin activation switches in a native membrane environment.

Steffen Lüdeke1, Mohana Mahalingam, Reiner Vogel

  • 1Institute of Molecular Medicine and Cell Research, Albert-Ludwigs-University Freiburg, Freiburg, Germany.

Photochemistry and Photobiology
|March 10, 2009
PubMed
Summary

Investigating rhodopsin activation in membranes reveals that Glu134 protonation is crucial for signaling. This finding, unlike detergent studies, highlights the lipid bilayer's essential role in G protein-coupled receptor function.

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Last Updated: Jun 25, 2026

Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Protein Dynamics

Background:

  • Understanding membrane protein function is challenging due to lipid bilayer influence.
  • Rhodopsin, a G protein-coupled receptor, is a model for studying activation mechanisms.
  • Previous studies in detergent environments alter key activation equilibria.

Purpose of the Study:

  • To investigate rhodopsin activation equilibria in its native membrane environment.
  • To develop a thermodynamic model for rhodopsin activation steps.
  • To elucidate the role of Glu134 protonation in receptor activation.

Main Methods:

  • UV-visible spectroscopy
  • Fourier-transform infrared spectroscopy
  • Thermodynamic modeling

Main Results:

  • Detergent environments alter activation equilibria compared to native membranes.
  • Protonation of Glu134 from the solvent is essential for full receptor activation in membranes.
  • This protonation is not required in detergent-solubilized rhodopsin.

Conclusions:

  • The lipid bilayer significantly impacts rhodopsin activation equilibria.
  • Glu134 protonation is a critical thermodynamic prerequisite for activation in native membranes.
  • Conserved residues like Glu134 may play similar roles in other Family A G protein-coupled receptors.