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J Biol Chem, Vol. 274, Issue 19, 12984-12989, May 7, 1999

-Arrestin-dependent Desensitization of Luteinizing Hormone/Choriogonadotropin Receptor Is Prevented by a Synthetic Peptide Corresponding to the Third Intracellular Loop of the Receptor

Sutapa Mukherjee, Krzysztof Palczewski^§, Vsevolod V. Gurevich^¶, and Mary Hunzicker-Dunn

From the  Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, Illinois 60611, the ^§ Department of Ophthalmology, Pharmacology, and Chemistry, University of Washington School of Medicine, Seattle, Washington 98195-6485, and the ^¶ Ralph and Muriel Roberts Laboratory for Vision Research, Sun Health Research Institute, Sun City, Arizona 85372

Desensitization is a ubiquitous response of guanine nucleotide-binding protein-coupled receptors (GPCRs) characterized by the waning of effector activity despite continued presence of agonist. Binding of an arrestin to the activated, often phosphorylated GPCR triggers desensitization. We reported for the luteinizing hormone/choriogonadotropin receptor (LH/CG R) that -arrestin tightly bound to porcine ovarian follicular membranes mediates agonist-dependent desensitization of LH/CG R-stimulated adenylyl cyclase (AC) activity (Mukherjee, S., Palczewski, K., Gurevich, V. V., Benovic, J. L., Banga, J. P., and Hunzicker-Dunn, M. (1999) Proc. Natl. Acad. Sci. U. S. A. 96, 493-498). We now show that addition of a synthetic peptide corresponding to the entire third intracellular loop (3i) of the LH/CG R completely and specifically reverses desensitization of AC activity, with an ED₅₀ of 10 µM but does not modulate basal, hCG-stimulated, or forskolin-stimulated AC activities. -Arrestin binds selectively to the 3i peptide coupled to activated Sepharose. Desensitization of LH/CG R-stimulated AC activity is rescued when the 3i peptide is preincubated with exogenous -arrestin. These results show that endogenous -arrestin participates in cell-free desensitization of agonist-dependent LH/CG R-stimulated AC activity in follicular membranes by interacting directly with the 3i loop of the receptor, thereby preventing G_s activation.

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