Posttranslation modification of G protein-coupled receptor in relationship to biased agonism

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Abstract

Biased signaling has been reported with a series of G protein-coupled receptors (GPCRs), including β2-adrenergic receptor and μ-opioid receptor (OPRM1). The concept of biased signaling suggests that the agonists of one particular receptor may activate the downstream signaling pathways with different efficacies. Thus in an extreme case, agonists might activate different sets of signaling pathways, which provide a new route to develop drugs with increased efficacies and decreased side effects. Among the many factors, posttranslation modifications of receptor proteins have major roles in influencing the biased signaling. Take OPRM1, for example, the phosphorylation and palmitoylation of receptor can regulate the biased signaling induced by agonists. Thus, by modulating these posttranslation modifications, the biased signaling of GPCRs can be regulated. In addition, although it is not considered as posttranslation modification normally, the distribution of GPCRs on cell membrane, especially the distribution between lipid-raft and non-raft microdomains, also contributes to the biased signaling. Thus in this chapter, we described the methods used in our laboratory to study receptor phosphorylation, receptor palmitoylation, and membrane distribution of receptor by using OPRM1 as a model. A functional model was also provided on these posttranslational modifications at the last section of this chapter.

Original languageEnglish (US)
Title of host publicationG Protein Coupled ReceptorsModeling, Activation, Interactions and Virtual Screening
PublisherAcademic Press Inc.
Pages391-408
Number of pages18
ISBN (Print)9780124078659
DOIs
StatePublished - 2013

Publication series

NameMethods in Enzymology
Volume522
ISSN (Print)0076-6879
ISSN (Electronic)1557-7988

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Keywords

  • Biased signaling
  • Lipid-raft
  • OPRM1
  • Palmitoylation
  • Phosphorylation

Cite this

Zheng, H., Loh, H. H., & Law, P-Y. (2013). Posttranslation modification of G protein-coupled receptor in relationship to biased agonism. In G Protein Coupled ReceptorsModeling, Activation, Interactions and Virtual Screening (pp. 391-408). (Methods in Enzymology; Vol. 522). Academic Press Inc.. https://doi.org/10.1016/B978-0-12-407865-9.00018-2