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Volume 272, Number 44, Issue of October 31, 1997 pp. 27497-27500
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

COMMUNICATION:
A beta -Arrestin/Green Fluorescent Protein Biosensor for Detecting G Protein-coupled Receptor Activation

(Received for publication, August 21, 1997)

Larry S. Barak , Stephen S. G. Ferguson , Jie Zhang and Marc G. Caron

From the Howard Hughes Medical Institute Laboratories and Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710

G protein-coupled receptors (GPCR) represent the single most important drug targets for medical therapy, and information from genome sequencing and genomic data bases has substantially accelerated their discovery. The lack of a systematic approach either to identify the function of a new GPCR or to associate it with a cognate ligand has added to the growing number of orphan receptors. In this work we provide a novel approach to this problem using a beta -arrestin2/green fluorescent protein conjugate (beta arr2-GFP). It provides a real-time and single cell based assay to monitor GPCR activation and GPCR-G protein-coupled receptor kinase or GPCR-arrestin interactions. Confocal microscopy demonstrates the translocation of beta arr2-GFP to more than 15 different ligand-activated GPCRs. These data clearly support the common hypothesis that the beta -arrestin binding of an activated receptor is a convergent step of GPCR signaling, increase by 5-fold the number of GPCRs known to interact with beta -arrestins, demonstrate that the cytosol is the predominant reservoir of biologically active beta -arrestins, and provide the first direct demonstration of the critical importance of G protein-coupled receptor kinase phosphorylation to the biological regulation of beta -arrestin activity and GPCR signal transduction in living cells. The use of beta arr2-GFP as a biosensor to recognize the activation of pharmacologically distinct GPCRs should accelerate the identification of orphan receptors and permit the optical study of their signal transduction biology intractable to ordinary biochemical methods.


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