Time-Resolved FRET Binding Assay to Investigate Hetero-Oligomer Binding Properties: Proof of Concept with Dopamine D/D Heterodimer.
Fiche publication
Date publication
novembre 2014
Auteurs
Membres identifiés du Cancéropôle Est :
Pr HIBERT Marcel
Tous les auteurs :
Hounsou C, Margathe JF, Oueslati N, Belhocine A, Dupuis E, Thomas C, Mann A, Ilien B, Rognan D, Trinquet E, Hibert M, Pin JP, Bonnet D, Durroux T
Lien Pubmed
Résumé
G protein-coupled receptors (GPCRs) have been described to form hetero-oligomers. The importance of these complexes in physiology and pathology is considered crucial, and heterodimers represent promising new targets to discover innovative therapeutics. However, there is a lack of binding assays to allow the evaluation of ligand affinity for GPCR hetero-oligomers. Using dopamine receptors and more specifically the D1 and D3 receptors as GPCR models, we developed a new time-resolved FRET (TR-FRET) based assay to determine ligand affinity for the D1/D3 heteromer. Based on the high-resolution structure of the dopamine D3 receptor (D3R), six fluorescent probes derived from a known D3R partial agonist (BP 897) were designed, synthesized and evaluated as high affinity and selective ligands for the D3/D2 receptors, and for other dopamine receptor subtypes. The highest affinity ligand 21 was then employed in the development of the D1/D3 heteromer assay. The TR-FRET was monitored between a fluorescent tag donor carried by the D1 receptor (D1R) and a fluorescent acceptor D3R ligand 21. The newly reported assay, easy to implement on other G protein-coupled receptors, constitutes an attractive strategy to screen for heteromer ligands.
Référence
ACS Chem Biol. 2014 Nov 11.