Structural and Functional Analysis of a β2-Adrenergic Receptor Complex with GRK5

Konstantin E. Komolov, Yang Du, Nguyen Minh Duc, Robin M. Betz, João P.G.L.M. Rodrigues, Ryan D. Leib, Dhabaleswar Patra, Georgios Skiniotis, Christopher M Adams, Ron O. Dror, Ka Young Chung, Brian K. Kobilka, Jeffrey L. Benovic

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66 Citations (Scopus)

Abstract

The phosphorylation of agonist-occupied G-protein-coupled receptors (GPCRs) by GPCR kinases (GRKs) functions to turn off G-protein signaling and turn on arrestin-mediated signaling. While a structural understanding of GPCR/G-protein and GPCR/arrestin complexes has emerged in recent years, the molecular architecture of a GPCR/GRK complex remains poorly defined. We used a comprehensive integrated approach of cross-linking, hydrogen-deuterium exchange mass spectrometry (MS), electron microscopy, mutagenesis, molecular dynamics simulations, and computational docking to analyze GRK5 interaction with the β2-adrenergic receptor (β2AR). These studies revealed a dynamic mechanism of complex formation that involves large conformational changes in the GRK5 RH/catalytic domain interface upon receptor binding. These changes facilitate contacts between intracellular loops 2 and 3 and the C terminus of the β2AR with the GRK5 RH bundle subdomain, membrane-binding surface, and kinase catalytic cleft, respectively. These studies significantly contribute to our understanding of the mechanism by which GRKs regulate the function of activated GPCRs. PaperClip

Original languageEnglish
Pages (from-to)407-421.e16
Number of pages31
JournalCell
Volume169
Issue number3
DOIs
Publication statusPublished - 20 Apr 2017
Externally publishedYes

Keywords

  • cross-linking
  • G-protein-coupled receptor
  • G-protein-coupled receptor kinases
  • mass spectrometry
  • molecular dynamics
  • phosphorylation
  • β-adrenergic receptor

Cite this

Komolov, K. E., Du, Y., Duc, N. M., Betz, R. M., Rodrigues, J. P. G. L. M., Leib, R. D., Patra, D., Skiniotis, G., Adams, C. M., Dror, R. O., Chung, K. Y., Kobilka, B. K., & Benovic, J. L. (2017). Structural and Functional Analysis of a β2-Adrenergic Receptor Complex with GRK5. Cell, 169(3), 407-421.e16. https://doi.org/10.1016/j.cell.2017.03.047