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Originally published In Press as doi:10.1074/jbc.M205767200 on September 19, 2002

J. Biol. Chem., Vol. 277, Issue 47, 44925-44931, November 22, 2002
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Quantitative Assessment of beta 1- and beta 2-Adrenergic Receptor Homo- and Heterodimerization by Bioluminescence Resonance Energy Transfer*

Jean-François MercierDagger §, Ali SalahpourDagger , Stéphane Angers, Andreas Breit, and Michel Bouvier||

From the Département de Biochimie and Groupe de Recherche sur le Système Nerveux Autonome, Université de Montréal, Montréal, Quebec H3C 3J7, Canada

Quantitative bioluminescence resonance energy transfer (BRET) analysis was applied to the study of beta 1- and beta 2-adrenergic receptor homo- and heterodimerization. To assess the relative affinity between each of the protomers, BRET saturation experiments were carried out in HEK-293T cells. beta 1- and beta 2-adrenergic receptors were found to have similar propensity to engage in homo- and heterotropic interactions suggesting that, at equivalent expression levels of the two receptor subtypes, an equal proportion of homo- and heterodimers would form. Analysis of the data also revealed that, at equimolar expression levels of energy donor and acceptor, more than 80% of the receptor molecules exist as dimers and that this high incidence of receptor dimerization is insensitive to receptor density for expression levels varying between 1.4 and 26.9 pmol of receptor/mg of membrane protein. Taken together, these results indicate that most of the receptors expressed in cells exist as constitutive dimers and that, at least in undifferentiated fibroblasts, the proportion of homo- and heterodimers between the closely related beta 1- and beta 2-adrenergic receptors is determined by their relative levels of expression.


* This work was supported in part by grants from the Canadian Institute for Health Research (CIHR) and the Heart and Stroke Foundation of Canada (to M. B.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger Both authors contributed equally to this work.

§ Held a studentship from the Fonds de la Recherche en Santé du Québec.

Hold studentships from the CIHR.

|| Holds a Canada Research Chair in Molecular and Cellular Pharmacology. To whom correspondence should be addressed: Dépt. de Biochimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Quebec H3C 3J7, Canada. Tel.: 514-343-6372; Fax: 514-343-2210; E-mail: michel.bouvier@umontreal.ca.


Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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