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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kumar, Puneet Pal, Kasturi Mathur, Maneesh Defea, Kathryn |
| Description | Author Affiliation: Pal K ( Cell Molecular Developmental Biology Program, University of California, Riverside, California 92521, USA.) |
| Abstract | ß-Arrestins are multifunctional adaptor proteins that, upon recruitment to an activated G-protein-coupled receptor, can promote desensitization of G-protein signaling and receptor internalization while simultaneously eliciting an independent signal. The result of ß-arrestin signaling depends upon the activating receptor. For example, activation of two G (q)-coupled receptors, protease-activated receptor-2 (PAR(2)) and neurokinin-1 receptor (NK1R), results in drastically different signaling events. PAR(2) promotes ß-arrestin-dependent membrane-sequestered extracellular signal-regulated kinase (ERK1/2) activation, cofilin activation, and cell migration, whereas NK1R promotes nuclear ERK1/2 activation and proliferation. Using bioluminescence resonance energy transfer to monitor receptor/ß-arrestin interactions in real time, we observe that PAR(2) has a higher apparent affinity for both ß-arrestins than does NK1R, recruits them at a faster rate, and exhibits more rapid desensitization of the G-protein signal. Furthermore, recruitment of ß-arrestins to PAR(2) does not require prior G (q) signaling events, whereas inhibition of G (q) signaling intermediates inhibits recruitment of ß-arrestins to NK1R. Using chimeric receptors in which the C terminus of PAR(2) is fused to the N terminus of NK1R and vice versa and a critical Ser/Thr mutant of PAR(2), we demonstrate that interactions between ß-arrestins and specific phosphoresidues in the C termini of each receptor are crucial for determining the rate and magnitude of ß-arrestin recruitment as well as the ultimate signaling outcome. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 5 |
| Volume Number | 288 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2013-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Arrestins Metabolism Receptor, PAR-2 Chemistry Receptors, Neurokinin-1 Signal Transduction Actin Depolymerizing Factors Amino Acid Sequence Animals CHO Cells Calcium Cell Movement Cricetinae Endocytosis Enzyme Activation Extracellular Signal-Regulated MAP Kinases GTP-Binding Protein Alpha Subunits, Gq-G11 HEK293 Cells Intracellular Space Kinetics Mice Mutant Proteins Neurokinin-1 Receptor Antagonists Phosphorylation Antagonists & Inhibitors Structure-Activity Relationship Subcellular Fractions Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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