Abstract
G protein-coupled receptors (GPCRs) belong to a major receptor family and regulate important physiological and pathological functions. Upon agonist activation, GPCRs couple to G proteins and induce the activation of G protein-dependent signaling pathways. The agonist-activated GPCRs are also phosphorylated by G protein-coupled receptor kinases (GRKs), which promote their interaction with arrestins. Arrestin binding induces desensitization (i.e., inability to couple to G proteins) and/or internalization of GPCRs. Arrestins not only desensitize and/or internalize GPCRs but also mediate other downstream signals such as mitogen-activated protein kinases. G protein-mediated signaling and arrestin-mediated signaling often result in different functional outcomes, and therefore, it has been suggested that signaling-selective regulation of GPCRs could lead to the development of more effective treatments with fewer side effects. Thus, studies have attempted to develop functionally biased (i.e., signaling-selective) GPCR-targeting drugs. To this end, it is important to elucidate the structural mechanism underlying functionally biased GPCR signaling, which includes understanding the structural mechanism underlying the GPCR-arrestin interaction. This review aims discuss the structural aspects of the GPCR-arrestin interaction, focusing on the differences between reported GPCR-arrestin complex structures.
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Acknowledgements
This work was supported by the National Research Foundation of Korea funded by the Korean government (NFR-2018R1A2B6001554 and NRF-2019R1A5A2027340).
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