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Retinal Conformation Changes Rhodopsin's Dynamic Ensemble.

Nicholas Leioatts1, Tod D Romo1, Shairy Azmy Danial1

  • 1Department of Biochemistry & Biophysics, University of Rochester Medical Center, Rochester, New York.

Biophysical Journal
|August 6, 2015
PubMed
Summary
This summary is machine-generated.

Retinal binding stabilizes rhodopsin dynamics, influencing its switch-like activity. Simulations reveal active retinal destabilizes the inactive state, suggesting complex allosteric signaling beyond classic models.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • G protein-coupled receptors (GPCRs) mediate cellular signaling via allosteric mechanisms.
  • Understanding ligand-induced conformational changes in GPCRs remains a biophysical challenge.
  • Rhodopsin's unique activation cycle, involving retinal isomerization, offers a model system.

Purpose of the Study:

  • To investigate the role of retinal in rhodopsin's conformational dynamics.
  • To elucidate the biophysical underpinnings of GPCR allosteric signaling.
  • To compare dynamics of rhodopsin with and without retinal.

Main Methods:

  • All-atom molecular dynamics simulations.
  • Extensive computational sampling (100 μs aggregate).
  • Analysis of receptor conformational ensembles.

Main Results:

  • Active retinal destabilizes the inactive rhodopsin state.
  • The active rhodopsin ensemble is structurally more homogeneous than the inactive state.
  • Ligand-free opsin exhibits greater conformational heterogeneity than retinal-bound rhodopsin.

Conclusions:

  • Retinal actively influences rhodopsin dynamics, not just passively stabilizing states.
  • GPCR allosteric mechanisms are more complex than traditional ligand-induced conformational selection models.
  • Rhodopsin dynamics provide insights into broader GPCR signaling mechanisms.