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Phosphorylation barcodes direct biased chemokine signaling at CXCR3

Journal Article · · Cell Chemical Biology
 [1];  [2];  [3];  [4];  [1];  [3];  [1];  [1];  [3];  [5];  [6];  [1];  [1];  [7];  [1];  [1];  [1];  [1];  [8];  [3] more »;  [6];  [4];  [3];  [9] « less
  1. Duke Univ., Durham, NC (United States)
  2. Massachusetts General Hospital, Boston, MA (United States); Brigham and Women's Hospital (Harvard Medical School), Boston, MA (United States); Beth Israel Deaconess Medical Center, Boston, MA (United States); Boston Children’s Hospital, Boston, MA (United States); Harvard Medical School, Boston, MA (United States)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  4. Pompeu Fabra Univ. (UPF), Barcelona (Spain)
  5. GlaxoSmithKline, Collegeville, PA (United States)
  6. Tohoku Univ., Sendai (Japan)
  7. Harvard Medical School, Boston, MA (United States)
  8. Pennsylvania State Univ., University Park, PA (United States)
  9. Duke Univ., Durham, NC (United States); Tohoku Univ., Sendai (Japan)

Chemokine receptors, a group of G protein-coupled receptors (GPCRs), interact with transducers such as G proteins, ß-arrestins, and GPCR kinases (GRKs). In the chemokine system, many chemokine agonists act as “biased agonists” that preferentially activate distinct signaling effectors when binding to the same receptor, resulting in distinct physiological effects. Although one third of FDA-approved drugs target GPCRs, there has been limited success in targeting the chemokine system. Currently, there is little evidence that differential receptor phosphorylation, or “phosphorylation barcodes,” direct these biased responses at chemokine receptors. To address this knowledge gap, we used mass spectrometry to demonstrate that chemokines of CXCR3 promote different ensembles of phosphorylation barcodes that are associated with differential activation of G proteins, ß-arrestins and GRKs. Chemokine stimulation also resulted in distinct changes throughout the kinome in global phosphoproteomic studies. Mutation of specific CXCR3 phosphosites altered ß-arrestin conformation and impacted ß-arrestin activation in molecular dynamics simulations. T-cells expressing phosphorylation-deficient CXCR3 mutants resulted in distinct agonist- and receptor-specific chemotactic and signaling profiles that were not completely explained by engagement of G proteins, ß-arrestins, and GRKs alone. In conclusion, our results directly link distinct GPCR phosphorylation patterns with non-redundant chemokine signaling (Figure 1).

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH); American Heart Association (AHA)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
3006969
Report Number(s):
PNNL-SA--174068
Journal Information:
Cell Chemical Biology, Journal Name: Cell Chemical Biology Journal Issue: 4 Vol. 30; ISSN 2451-9456
Publisher:
Cell PressCopyright Statement
Country of Publication:
United States
Language:
English

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