Allosteric interactions within the AT 1 angiotensin receptor homodimer: Role of the conserved DRY motif

Bence Szalai, László Barkai, Gábor Turu, László Szidonya, P. Várnai, L. Hunyady

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

G protein coupled receptor (GPCR) dimerization has a remarkable impact on the diversity of receptor signaling. Allosteric communication between the protomers of the dimer can alter ligand binding, receptor conformation and interactions with different effector proteins. In this study we investigated the allosteric interactions between wild type and mutant protomers of type 1 angiotensin receptor (AT 1R) dimers transiently expressed in CHO cells. In our experimental setup, one protomer of the dimer was selectively stimulated and the β-arrestin2 binding and conformation alteration of the other protomer was followed. The interaction between β-arrestin2 and the non-stimulated protomer was monitored through a bioluminescence resonance energy transfer (BRET) based method. To measure the conformational alterations in the non-stimulated protomer directly, we also used a BRET based intramolecular receptor biosensor, which was created by inserting yellow fluorescent protein (YFP) into the 3rd intracellular loop of AT 1R and fusing Renilla luciferase (RLuc) to its C terminal region. We have detected β-arrestin2 binding, and altered conformation of the non-stimulated protomer. The cooperative ligand binding of the receptor homodimer was also observed by radioligand dissociation experiments. Mutation of the conserved DRY sequence in the activated protomer, which is also required for G protein activation, abolished all the observed allosteric effects. These data suggest that allosteric interactions in the homodimers of AT 1R significantly affect the function of the non-stimulated protomer, and the conserved DRY motif has a crucial role in these interactions.

Original languageEnglish
Pages (from-to)477-485
Number of pages9
JournalBiochemical Pharmacology
Volume84
Issue number4
DOIs
Publication statusPublished - Aug 15 2012

Fingerprint

Angiotensin Receptors
Protein Subunits
Dimers
Bioluminescence
Conformations
Energy Transfer
Energy transfer
Renilla Luciferases
Ligands
Angiotensin Type 1 Receptor
Dimerization
CHO Cells
Conserved Sequence
Biosensing Techniques
G-Protein-Coupled Receptors
GTP-Binding Proteins
Biosensors
Proteins
Chemical activation
Mutation

Keywords

  • Allosteric interaction
  • Angiotensin receptor
  • BRET
  • Dimerization
  • GPCR

ASJC Scopus subject areas

  • Pharmacology
  • Biochemistry

Cite this

Allosteric interactions within the AT 1 angiotensin receptor homodimer : Role of the conserved DRY motif. / Szalai, Bence; Barkai, László; Turu, Gábor; Szidonya, László; Várnai, P.; Hunyady, L.

In: Biochemical Pharmacology, Vol. 84, No. 4, 15.08.2012, p. 477-485.

Research output: Contribution to journalArticle

Szalai, Bence ; Barkai, László ; Turu, Gábor ; Szidonya, László ; Várnai, P. ; Hunyady, L. / Allosteric interactions within the AT 1 angiotensin receptor homodimer : Role of the conserved DRY motif. In: Biochemical Pharmacology. 2012 ; Vol. 84, No. 4. pp. 477-485.
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