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Related Experiment Videos

Pheromone binding by polymorphic mouse major urinary proteins.

Scott D Sharrow1, Jeffrey L Vaughn, Lukás Zídek

  • 1Institute for Pheromone Research and Department of Chemistry, Indiana University, Bloomington, Indiana 47405-0001, USA.

Protein Science : a Publication of the Protein Society
|August 23, 2002
PubMed
Summary

Mouse major urinary proteins (MUPs) bind pheromones with varying affinities. Nasal MUP-IV shows high affinity for pheromones, suggesting a role in pheromone transport and receptor interaction.

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Area of Science:

  • Biochemistry
  • Animal Behavior
  • Molecular Biology

Background:

  • Mouse major urinary proteins (MUPs) are implicated in pheromone regulation.
  • Understanding MUP-pheromone interactions is key to deciphering olfactory communication.

Purpose of the Study:

  • To quantify the binding affinities of various MUP isoforms to key pheromonal ligands.
  • To investigate the role of MUP isoforms in pheromone sequestration and transport.

Main Methods:

  • Recombinant expression of five urinary MUP isoforms (MUPs-I, II, VII, VIII, IX) and one nasal isoform (MUP-IV).
  • Isothermal titration calorimetry and intrinsic protein fluorescence to determine dissociation constants (K(d)) for MUP-pheromone pairs.
  • Isolation of MUP-IV protein from mouse nasal extracts.

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Main Results:

  • MUP isoforms exhibit differential binding affinities for pheromones: (+/-)-2-sec-butyl-4,5-dihydrothiazole (SBT), 6-hydroxy-6-methyl-3-heptanone (HMH), and (+/-)dehydro-exo-brevicomin (DHB).
  • SBT binding affinities (K(d) ~0.04–0.9 µM) were significantly higher than DHB (~26–58 µM) and HMH (~50–200 µM).
  • Nasal MUP-IV displayed a notably higher affinity for SBT compared to urinary MUPs.

Conclusions:

  • Structural variations in MUP binding cavities correlate with observed differences in pheromone ligand affinities.
  • While urinary MUP heterogeneity offers limited support for regulating pheromone profiles, nasal MUPs likely play a role in pheromone sequestration and delivery to receptors.