Chemical Senses Advance Access originally published online on March 1, 2005
Chemical Senses 2005 30(3):195-207; doi:10.1093/chemse/bji015
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Functional Characterization of Two Human Olfactory Receptors Expressed in the Baculovirus Sf9 Insect Cell System
1 UMR 6149 et GDR 2590 CNRS et Université de Provence, IFR du Cerveau, 31 Chemin J. Aiguier, F-13402 Marseille Cedex 20, France, 2 Laboratoire de Recherches sur les Arômes, INRA, 17 rue Sully, BP 86510, 21065 Dijon Cedex, France and 3 Station de Recherches de Pathologie Comparée, CNRS- INRA et GDR 2590, St Christol-Lez-Alès, France
Correspondence to be sent to: Pr. Catherine Ronin, UMR 6149, CNRS, 31 Chemin J. Aiguier, F-13402 Marseille Cedex 20, France. Email: ronin{at}lnb.cnrs-mrs.fr
Olfactory receptors (ORs) are the largest member of the G-protein-coupled receptors which mediate early olfactory perception in discriminating among thousands of odorant molecules. Assigning odorous ligands to ORs is a prerequisite to gaining an understanding of the mechanisms of odorant recognition. The functional expression of ORs represents a critical step in addressing this issue. Due to limitations in heterologous expression, very few mammal ORs have been characterized, and so far only one is from human origin. Consequently, OR function still remains poorly understood, especially in humans, whose genome encodes a restricted chemosensory repertoire compared with most mammal species. In this study, we have designed cassette baculovirus vectors to coexpress human OR 17-209 or OR 17-210 with either G
olf or G16 proteins in Sf9 cells. Each OR was found to be expressed at the cell surface and colocalized with both G proteins. Using Ca2+ imaging, we showed that OR 17-209 and OR 17-210 proteins are activated by esters and ketones respectively. Odorant-induced calcium response was increased when ORs were coexpressed with G16 protein ,whereas coexpression with Golf abolished calcium signaling. This strategy has been found to overcome most of the limitations encountered when expressing an OR protein and has permitted odorant screening of functional ORs. Our approach could thus be of interest for further expression and ligand assignment of other orphan receptor proteins.
Key words: baculovirus, calcium imaging, confocal microscopy, GPCR, insect cell system, olfactory receptor
* Contributed equally to this paper and should be considered as first coauthors.
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