Figure 5. Effects of bivalent ligands on bystander BRET.
Shown are the saturation curves obtained by co-expressing pairs of Rlu-tagged MOP receptor and YFP-tagged CCK2 receptor constructs after incubation with bivalent ligands (10−6M), as indicated. Bivalent ligands 3a-c produced exponential curves that reached a plateau, supporting specific molecular interactions. Cells treated with either no ligand or with a combination of monovalent ligands for the CCK and mu-opioid receptors showed curves not significantly different from linear fits. Values represent means±S.E.M of data from five independent experiments.