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Updated: May 13, 2026

Methodology for Studying Interactions of Vitamin A Membrane Receptors and Opsin Protein with their Ligands in Generating the Retinylidene Protein
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Structural insight into proteorhodopsin oligomers.

Katherine M Stone1, Jeda Voska, Maia Kinnebrew

  • 1Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California, USA.

Biophysical Journal
|February 28, 2013
PubMed
Summary
This summary is machine-generated.

Proteorhodopsin (PR) forms hexamers, but its structure was unknown. Site-directed spin-labeling revealed a defined, radial orientation of PR subunits within the hexamer, clarifying its structural organization.

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

Published on: June 27, 2014

Area of Science:

  • Structural Biology
  • Membrane Protein Biophysics

Background:

  • Oligomerization is crucial for membrane protein function.
  • Structural determination of large, non-crystallizable membrane protein oligomers is difficult.
  • Proteorhodopsin (PR) forms hexamers in membranes, but its subunit organization is unclear.

Purpose of the Study:

  • To elucidate the structural organization and subunit interface of proteorhodopsin (PR) hexamers.
  • To model the specific orientation of PR subunits within the hexameric complex.

Main Methods:

  • Site-directed spin-labeling (SDSL).
  • Electron spin-resonance (ESR) lineshape analysis.
  • Overhauser dynamic nuclear polarization (DNP) analysis.
  • Local solvent dynamics measurements.

Main Results:

  • Determined intersubunit distances within the PR hexamer.
  • Established a model for the radial orientation of PR subunits.
  • Identified specific loop regions (A-B and E-F) facing the hexamer core and exterior.
  • Resolved protein surface exposure at key residue sites.

Conclusions:

  • PR subunits adopt a defined, radial orientation within the hexamer.
  • The A-B loop (residue 55) faces the hexamer core, while the E-F loop (residue 177) faces the exterior.
  • SDSL and DNP provide powerful constraints for modeling membrane protein oligomer structures.