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Vol. 53, Issue 1, 1-24, March 2001

Evolving Concepts in G Protein-Coupled Receptor Endocytosis: The Role in Receptor Desensitization and Signaling

Stephen S. G. Ferguson1

The John P. Robarts Research Institute and Departments of Physiology, Pharmacology and Toxicology, and Medicine, University of Western Ontario, London, Ontario, Canada

I. Introduction
II. G Protein-Coupled Receptor Desensitization
    A. Protein Kinase Phosphorylation
        1. Second Messenger-Dependent Protein Kinases.
        2. G Protein-Coupled Receptor Kinases.
            a. The G Protein-Coupled Receptor Kinase Family.
            b. Targeting and Regulation.
            c. Site of Action.
        3. Other Kinases.
    B. The Arrestins
        1. The Arrestin Family.
        2. Receptor Binding.
III. G Protein-Coupled Receptor Internalization
    A. Molecular Mechanisms Involved in G Protein-Coupled Receptor Endocytosis
        1. Role of G Protein-Coupled Receptor Kinase and beta -Arrestin Proteins.
        2. Clathrin and beta -Adaptin Interactions.
        3. beta -Arrestin Regulation.
        4. Alternative G Protein-Coupled Receptor Endocytic Pathways.
        5. Receptor Determinants for Endocytosis.
    B. Biological Role of G Protein-Coupled Receptor Internalization
        1. Endocytosis and G Protein-Coupled Receptor Desensitization.
        2. Endocytosis and G Protein-Coupled Receptor Resensitization.
        3. Endocytosis and G Protein-Coupled Receptor Signaling.
IV. Conclusions
Acknowledgments
References

G protein-coupled receptors (GPCRs) are seven transmembrane proteins that form the largest single family of integral membrane receptors. GPCRs transduce information provided by extracellular stimuli into intracellular second messengers via their coupling to heterotrimeric G proteins and the subsequent regulation of a diverse variety of effector systems. Agonist activation of GPCRs also initiates processes that are involved in the feedback desensitization of GPCR responsiveness, the internalization of GPCRs, and the coupling of GPCRs to heterotrimeric G protein-independent signal transduction pathways. GPCR desensitization occurs as a consequence of G protein uncoupling in response to phosphorylation by both second messenger-dependent protein kinases and G protein-coupled receptor kinases (GRKs). GRK-mediated receptor phosphorylation promotes the binding of beta -arrestins, which not only uncouple receptors from heterotrimeric G proteins but also target many GPCRs for internalization in clathrin-coated vesicles. beta -Arrestin-dependent endocytosis of GPCRs involves the direct interaction of the carboxyl-terminal tail domain of beta -arrestins with both beta -adaptin and clathrin. The focus of this review is the current and evolving understanding of the contribution of GRKs, beta -arrestins, and endocytosis to GPCR-specific patterns of desensitization and resensitization. In addition to their role as GPCR-specific endocytic adaptor proteins, beta -arrestins also serve as molecular scaffolds that foster the formation of alternative, heterotrimeric G protein-independent signal transduction complexes. Similar to what is observed for GPCR desensitization and resensitization, beta -arrestin-dependent GPCR internalization is involved in the intracellular compartmentalization of these protein complexes.


1 Address for correspondence: Stephen S. G. Ferguson, The John P. Robarts Research Institute, University of Western Ontario, 100 Perth Dr., P.O. Box 5015, London, Ontario, Canada N6A 5K8. E-mail: ferguson{at}rri.on.ca


0031-6997/01/5301-0001$03.00/0
PHARMACOLOGICAL REVIEWS
Copyright © 2001 by The American Society for Pharmacology and Experimental Therapeutics



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