Wade F.,UR1197 |
Espagne A.,University Paris - Sud |
Persuy M.-A.,UR1197 |
Vidic J.,French National Institute for Agricultural Research |
And 4 more authors.
Journal of Biological Chemistry | Year: 2011
G-protein-coupled receptor homo-oligomerization has been increasingly reported. However, little is known regarding the relationship between activation of the receptor and its association/conformational states. The mammalian olfactory receptors (ORs) belong to the G protein-coupled receptor superfamily. In this study, the homo-oligomerization status of the human OR1740 receptor and its involvement in receptor activation upon odorant ligand binding were addressed by co-immunoprecipitation and bioluminescence resonance energy transfer approaches using crude membranes or membranes from different cellular compartments. For the first time, our data clearly show that mammalian ORs constitutively self-associate into homodimers at the plasma membrane level. This study also demonstrates that ligand binding mediates a conformational change and promotes an inactive state of the OR dimers at high ligand concentrations. These findings support and validate our previously proposed model of OR activation/inactivation based on the tripartite odorant-binding proteinodorant-OR partnership. © 2011 by The American Society for Biochemistry and Molecular Biology, Inc.