Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2007 May;71(5):1329-40.
doi: 10.1124/mol.106.030304. Epub 2007 Jan 31.

Real-time analysis of agonist-induced activation of protease-activated receptor 1/Galphai1 protein complex measured by bioluminescence resonance energy transfer in living cells

Mohammed A Ayoub  1 , Damien Maurel, Virginie Binet, Michel Fink, Laurent Prézeau, Hervé Ansanay, Jean-Philippe Pin
Affiliations
Free article

Real-time analysis of agonist-induced activation of protease-activated receptor 1/Galphai1 protein complex measured by bioluminescence resonance energy transfer in living cells

Mohammed A Ayoub et al. Mol Pharmacol. 2007 May.
Free article

Abstract

G protein-coupled receptors transmit extracellular signals into the cells by activating heterotrimeric G proteins, a process that is often followed by receptor desensitization. Monitoring such a process in real time and in living cells will help better understand how G protein activation occurs. Energy transfer-based approaches [fluorescence resonance energy transfer (FRET) and bioluminescence resonance energy transfer (BRET)] were recently shown to be powerful methods to monitor the G protein-coupled receptors (GPCRs)-G protein association in living cells. Here, we used a BRET technique to monitor the coupling between the protease-activated receptor 1 (PAR1) and Galpha(i1) protein. A specific constitutive BRET signal can be measured between nonactivated PAR1 and the Galpha(i1) protein expressed at a physiological level. This signal is insensitive to pertussis toxin (PTX) and probably reflects the preassembly of these two proteins. The BRET signal rapidly increases upon receptor activation in a PTX-sensitive manner. The BRET signal then returns to the basal level after few minutes. The desensitization of the BRET signal is concomitant with beta-arrestin-1 recruitment to the receptor, consistent with the known rapid desensitization of PARs. The agonist-induced BRET increase was dependent on the insertion site of fluorophores in proteins. Taken together, our results show that BRET between GPCRs and Galpha proteins can be used to monitor the receptor activation in real time and in living cells. Our data also revealed that PAR1 can be part of a preassembled complex with Galpha(i1) protein, resulting either from a direct interaction between these partners or from their colocalization in specific microdomains, and that receptor activation probably results in rearrangements within such complexes.

PubMed Disclaimer

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

Publication types

MeSH terms

LinkOut - more resources