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Distinct conformations of GPCR??-arrestin complexes mediate desensitization, signaling, and endocytosis #MMPMID28223524
Proc Natl Acad Sci U S A 2017[Mar]; 114 (10): 2562-7 PMID28223524show ga
?-Arrestins (?arrs) interact with G protein-coupled receptors (GPCRs) to desensitize G protein signaling, initiate signaling on their own, and mediate receptor endocytosis. Using a panel of GPCRs believed to couple differently to ?arrs, we demonstrate how distinct conformations of GPCR??arr complexes are specialized to perform different subsets of these cellular functions. Our results thus provide a new signaling paradigm for the understanding of GPCRs, whereby a specific GPCR??arr conformation mediates receptor desensitization, and another drives internalization and some forms of signaling.