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Related Experiment Videos

Identification of a third rat odorant-binding protein (OBP3).

D Löbel1, J Strotmann, M Jacob

  • 1Institute of Physiology, University of Hohenheim, Stuttgart, Germany.

Chemical Senses
|July 28, 2001
PubMed
Summary

Researchers identified a novel rat lipocalin, OBP3, in the olfactory epithelium. This protein binds odorants with high affinity, suggesting a role in olfaction.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Olfactory Science

Background:

  • Lipocalins are a diverse protein family involved in binding and transporting small hydrophobic molecules.
  • Odorant-binding proteins (OBPs) are crucial for olfaction, facilitating odorant transport to olfactory receptors.

Purpose of the Study:

  • To isolate and characterize a novel lipocalin from the rat olfactory epithelium.
  • To investigate the odorant-binding properties and potential function of the newly identified protein.

Main Methods:

  • cDNA library screening and molecular cloning.
  • In situ hybridization for expression pattern analysis.
  • Heterologous protein expression and spectroscopic binding assays.
  • Isothermal titration calorimetry for thermodynamic analysis.

Main Results:

  • A lipocalin gene, designated OBP3, was isolated from rat olfactory epithelium cDNA.
  • OBP3 exhibited strong expression in nasal glands, similar to rat OBP1.
  • Recombinant OBP3 bound fluorescent probes (1-AMA) and competed with high-affinity odorants.
  • Thermodynamic parameters of OBP3-odorant interactions were determined.

Conclusions:

  • OBP3 is a novel rat odorant-binding protein with characteristics suggesting a role in the olfactory system.
  • The protein's nasal expression and demonstrated odorant-binding capabilities support its involvement in olfaction.

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