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A novel molecular mechanism responsible for phosphorylation-independent desensitization of G protein-coupled receptors exemplified by the dopamine D3 receptor.
Metadata
Journalbiochemical and biophysical research communications2.985Date
2020 Jun 03
4 months ago
Type
Journal Article
Volume
2020-Jul-30 / 528 : 432-439
Author
Zheng M 1, Zhang X 1, Sun N 1, Min X 1, Acharya S 1, Kim KM 2
Affiliation
  • 2. Department of Pharmacology, College of Pharmacy, Chonnam National University, Gwang-Ju, 61186, Republic of Korea. Electronic address: [email protected]
Doi
PMIDMESH
Abstract
GRK-mediated receptor phosphorylation followed by association with β-arrestins has been proposed to be the molecular mechanism involved in the desensitization of G protein-coupled receptors (GPCRs). However, this mechanism does not explain the desensitization of some GPCRs, such as dopamine D3 receptor (D3R), which does not undergo GRK-mediated phosphorylation. Loss-of-function approaches and mutants of dopamine D2 receptor and D3R, which exhibit different desensitization properties, were used to identify the cellular components and processes responsible for desensitization. D3R mediated the recruitment of Mdm2 to the cytosol, which resulted in the constitutive ubiquitination of β-arrestin2 in the resting state. Under desensitization conditions, cytosolic Mdm2 returned to the nucleus, resulting in the deubiquitination of cytosolic β-arrestins. Deubiquitinated β-arrestins formed a tight complex with Gβγ, thereby sequestering it, causing interference in D3R signaling. In conclusion, this study shows that β-arrestins, depending on their ubiquitination status, control the G protein cycling by regulating their interactions with Gβγ. This is a novel mechanism proposed to explain how certain GPCRs can undergo desensitization without receptor phosphorylation.
Keywords: Desensitization Dopamine D(3) receptor GPCR Gβγ Mdm2 β-Arrestin
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Biochem Biophys Res Communbiochemical and biophysical research communications
Metadata
LocationUnited States
FromACADEMIC PRESS INC ELSEVIER SCIENCE

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