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Related Experiment Videos

Is the olfactory receptor a metalloprotein?

Jiangyun Wang1, Zaida A Luthey-Schulten, Kenneth S Suslick

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 2003
PubMed
Summary

Metal ions may play a key role in how olfactory receptors (ORs) recognize scents. Researchers propose a "shuttlecock" mechanism involving metal ion binding to a specific OR loop, explaining structural changes during odorant detection.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Molecular Biology

Background:

  • The sense of smell, mediated by olfactory receptors (ORs), is crucial yet poorly understood.
  • Mammals possess approximately 1,000 olfactory genes, highlighting the complexity of scent detection.
  • Olfactory receptors are seven-helix transmembrane proteins, but their structural details and odorant recognition mechanisms remain elusive.

Purpose of the Study:

  • To propose a novel hypothesis for odorant recognition involving metal ions.
  • To identify a potential metal-binding site within olfactory receptors.
  • To elucidate the structural changes in ORs upon odorant binding.

Main Methods:

  • Analysis of predicted olfactory receptor structures and consensus sequences.
  • Synthesis of a pentapeptide containing a putative metal-binding site.

Related Experiment Videos

  • Biochemical assays to assess metal ion binding affinity and structural transitions.

    • Main Results:

    • A putative metal-binding site was identified in the loop between the fourth and fifth helix (4-5 loop) of olfactory receptors.
    • A synthetic pentapeptide demonstrated high affinity for Cu(II) and Zn(II) ions.
    • Metal ion binding induced a significant transition to an alpha-helical structure in the pentapeptide.

    Conclusions:

    • Metal ions are proposed to play a critical role in odorant recognition by olfactory receptors.
    • A
    • shuttlecock
    • mechanism is hypothesized, involving metal ion binding to the 4-5 loop and subsequent membrane penetration.
    • This mechanism explains structural changes in ORs essential for initiating nerve cell activity upon odorant detection.