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Related Concept Videos

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Related Experiment Video

Updated: Apr 17, 2026

Strategic Screening and Characterization of the Visual GPCR-mini-G Protein Signaling Complex for Successful Crystallization
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Sequential structural changes in rhodopsin occurring upon photoactivation.

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  • 1Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, 11794-5215, USA.

Methods in Molecular Biology (Clifton, N.J.)
|February 21, 2015
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Summary

Solid-state magic angle spinning NMR spectroscopy reveals the structure and dynamics of inactive rhodopsin and the active metarhodopsin II intermediate. This technique utilizes labeled amino acids and low-temperature methods for detailed molecular insights.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • Rhodopsin is a key visual G protein-coupled receptor.
  • Understanding rhodopsin's conformational changes is crucial for its function.
  • Characterizing the active metarhodopsin II intermediate remains challenging.

Purpose of the Study:

  • To characterize the structure and dynamics of dark, inactive rhodopsin.
  • To investigate the active metarhodopsin II intermediate.
  • To demonstrate the utility of solid-state NMR for membrane protein studies.

Main Methods:

  • Large-scale production of (13)C- and (15)N-labeled, functional rhodopsin using HEK293S cells.
  • Solid-state magic angle spinning NMR spectroscopy.
  • Measurement of chemical shifts and dipolar couplings.
  • Low-temperature trapping of the metarhodopsin II intermediate.

Main Results:

  • Solid-state NMR provides structural and dynamic information in membrane environments.
  • Successful expression of stable, functional, labeled rhodopsin.
  • Characterization of both inactive rhodopsin and the active metarhodopsin II state is feasible.

Conclusions:

  • Solid-state magic angle spinning NMR is a powerful tool for studying membrane protein structure and dynamics.
  • This method enables detailed investigation of rhodopsin's conformational states.
  • The findings contribute to a deeper understanding of G protein-coupled receptor mechanisms.