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J Biol Chem, Vol. 274, Issue 16, 10999-11006, April 16, 1999

Cellular Trafficking of G Protein-coupled Receptor/beta -Arrestin Endocytic Complexes

Jie ZhangDagger , Larry S. BarakDagger , Pieter H. Anborgh§, Stephane A. LaporteDagger , Marc G. CaronDagger , and Stephen S. G. Ferguson§

From the Dagger  Howard Hughes Medical Institute Laboratories, Departments of Cell Biology and Medicine, Duke University Medical Center, Durham, North Carolina 27710 and the § John P. Robarts Research Institute, Departments of Physiology and Pharmacology and Toxicology, University of Western Ontario, P.O. Box 5015, 100 Perth Drive, London, Ontario N6A 5K8, Canada

beta -Arrestins are multifunctional proteins identified on the basis of their ability to bind and uncouple G protein-coupled receptors (GPCR) from heterotrimeric G proteins. In addition, beta -arrestins play a central role in mediating GPCR endocytosis, a key regulatory step in receptor resensitization. In this study, we visualize the intracellular trafficking of beta -arrestin2 in response to activation of several distinct GPCRs including the beta 2-adrenergic receptor (beta 2AR), angiotensin II type 1A receptor (AT1AR), dopamine D1A receptor (D1AR), endothelin type A receptor (ETAR), and neurotensin receptor (NTR). Our results reveal that in response to beta 2AR activation, beta -arrestin2 translocation to the plasma membrane shares the same pharmacological profile as described for receptor activation and sequestration, consistent with a role for beta -arrestin as the agonist-driven switch initiating receptor endocytosis. Whereas redistributed beta -arrestins are confined to the periphery of cells and do not traffic along with activated beta 2AR, D1AR, and ETAR in endocytic vesicles, activation of AT1AR and NTR triggers a clear time-dependent redistribution of beta -arrestins to intracellular vesicular compartments where they colocalize with internalized receptors. Activation of a chimeric AT1AR with the beta 2AR carboxyl-terminal tail results in a beta -arrestin membrane localization pattern similar to that observed in response to beta 2AR activation. In contrast, the corresponding chimeric beta 2AR with the AT1AR carboxyl-terminal tail gains the ability to translocate beta -arrestin to intracellular vesicles. These results demonstrate that the cellular trafficking of beta -arrestin proteins is differentially regulated by the activation of distinct GPCRs. Furthermore, they suggest that the carboxyl-tail of the receptors might be involved in determining the stability of receptor/beta arrestin complexes and cellular distribution of beta -arrestins.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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