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Vol. 54, Issue 3, 527-559, September 2002

Cellular Regulation of RGS Proteins: Modulators and Integrators of G Protein Signaling

Susanne Hollinger and John R. Hepler

Department of Pharmacology, Emory University School of Medicine, Atlanta, Georgia

I. Introduction
II. RGS Proteins Directly Regulate G Protein Activity
    A. G Protein Activation and Deactivation and Early Evidence for RGS Proteins
    B. Discovery of RGS Proteins
    C. RGS Proteins Are GTPase-Activating Proteins for Galpha
    D. Structure and Classification of RGS Proteins
    E. Simple versus Complex RGS Proteins
III. RGS Proteins Modulate G Protein Signaling
    A. RGS4 Modulation of Gq/11-Directed Ca2+ Signaling
        1. Cellular Mechanisms That Influence RGS4 Membrane Recruitment and Attachment.
        2. Once Bound to Membranes, What Factors Influence RGS4 Specificity for Target Galpha in Cells?
        3. Once RGS4 Is Bound to Membranes and Functionally Linked to Receptor and G Protein, What Factors Regulate Its Effects on Ca2+ Signaling?
        4. What Factors Contribute to Turning Off This Signaling Loop?
    B. RGS4 As a Possible Scaffolding Protein That Links Receptors to Related Signaling Proteins
    C. RGS Modulation of the Kinetics of Fast-Acting Signaling Responses
IV. RGS Proteins Integrate G Protein Signals
    A. RGS Proteins Integrate Distinct G Protein Signaling Pathways
    B. RGS Proteins Integrate G Protein and Non-G Protein-Linked Signals
    C. RGS Proteins Link Galpha to Monomeric GTPases
    D. RGS Proteins As Scaffolds to Assemble Related Signaling Components
    E. RGS Proteins Regulate Intracellular Trafficking
    F. RGS Protein Interactions with Non-G Protein Binding Partners
V. Cellular Mechanisms Regulating RGS Protein Functions
    A. Regulation of RGS Signaling Capacity by Feedback Phosphorylation
    B. Membrane Targeting and Lipid Modification
    C. Factors Regulating RGS Protein Half-Life
    D. Targeted Subcellular Localization of RGS Proteins
    E. Factors Regulating Cellular Expression of RGS Proteins
    F. Expression of Alternatively Spliced Gene Products
VI. RGS Proteins As Therapeutic Targets
    A. Roles for RGS Proteins in Cell Migration and Development
    B. Roles of RGS Proteins in Organ Physiology
    C. RGS Proteins in Neuronal Function and Behavior
    D. RGS Proteins in Disease States
    E. Molecular Targets for Drug Development
        1. Direct Modulation of RGS/Galpha Binding.
        2. Allosteric Modulation of RGS/Galpha Binding.
        3. Selectivity of RGS-Galpha Interactions.
        4. Modulation of RGS Membrane Localization.
        5. Modulation of RGS Binding to GPCR, Effector and/or Regulatory Proteins.
VII. Conclusion and Future Directions
Acknowledgments
References

Regulators of G protein signaling (RGS) and RGS-like proteins are a family (>30 members) of highly diverse, multifunctional signaling proteins that bind directly to activated Galpha subunits. Family members are defined by a shared RGS domain, which is responsible for Galpha binding and markedly stimulates the GTPase activity of Galpha subunits leading to their deactivation and termination of downstream signals. Although much has been learned in recent years about the biochemistry of RGS/Galpha interactions, considerably less is known about the broader cellular roles and regulation of RGS proteins. Recent findings indicate that cellular mechanisms such as covalent modification, alternative gene splicing, and protein processing can dictate the activity and subcellular localization of RGS proteins. Many family members also directly link G proteins to a growing list of signaling proteins with diverse cellular roles. New findings indicate that RGS proteins act not as dedicated inhibitors but, rather, as tightly regulated modulators and integrators of G protein signaling. In some cases, RGS proteins modulate the lifetime and kinetics of both slow-acting (e.g., Ca2+ oscillations) and fast-acting (e.g., ion conductances, phototransduction) signaling responses. In other cases, RGS proteins integrate G proteins with signaling pathways linked to such diverse cellular responses as cell growth and differentiation, cell motility, and intracellular trafficking. These and other recent studies with animal model systems indicate that RGS proteins play important roles in both physiology and disease. Recognition of the central functions these proteins play in vital cellular processes has focused our attention on RGS proteins as exciting new candidates for therapeutic intervention and drug development.


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Copyright © 2002 by The American Society for Pharmacology and Experimental Therapeutics



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