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Related Experiment Videos

Odorant binding and conformational dynamics in the odorant-binding protein.

Eric Hajjar1, David Perahia, Hélène Débat

  • 1CNRS UMR8619, Modélisation et Ingénierie des Protéines, Université Paris-Sud, 91405 Orsay, France.

The Journal of Biological Chemistry
|July 20, 2006
PubMed
Summary

Odorant-binding proteins (OBPs) in mammals may actively transport odorants to olfactory receptors. Molecular dynamics revealed how rat OBPs bind thymol, showing strand opening consistent with receptor recognition.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroscience

Background:

  • Mammalian olfactory epithelium secretes odorant-binding proteins (OBPs), a type of lipocalin.
  • OBPs are found in the mucus layer, protecting olfactory neurons and potentially aiding odorant transport.

Purpose of the Study:

  • To elucidate the molecular mechanisms of OBPs in the initial steps of olfaction.
  • To investigate the interaction between OBPs and odorant molecules at an atomic level.

Main Methods:

  • Molecular dynamics (MD) simulations of rat and pig OBPs with the odorant thymol.
  • Analysis of conformational changes and ligand unbinding pathways using MD.
  • Calculation of the potential of mean force (PMF) for ligand unbinding.
  • Titration microcalorimetry to confirm specific ligand binding.

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Main Results:

  • MD simulations revealed a consensus pathway for ligand unbinding in rat OBP.
  • Observed conformational changes, including lipocalin strand pair opening, in both rat and pig OBPs upon ligand binding.
  • Titration microcalorimetry confirmed specific, hydrophobic binding of thymol to OBPs.

Conclusions:

  • OBPs may play an active role in olfaction beyond passive transport.
  • The observed conformational changes suggest a mechanism for OBP-ligand complex recognition by olfactory receptors.
  • These findings provide atomic-level insights into the early events of the olfactory process.