FRET and BRET sensors operate on the principle of energy transfer between a fluorescent or luminescent One of the significant advantages of FRET and BRET-based sensors is their ability to provide real-time BERKY consists of a membrane linker, a BRET donor, an ER/K α-helix linker, a BRET acceptor, and an active Lee, Probing Arrestin Function Using Intramolecular FlAsH-BRET Biosensors.  Goyet, E., et al., Fast and high resolution single-cell BRET imaging. 

September 2022 "G protein-coupled receptor (GPCR) kinases (GRKs) and arrestins mediate GPCR desensitization, internalization, and signaling. The spatial pattern of GPCR phosphorylation is predicted to trigger these discrete GRK and arrestin-mediated functions. Here, we provide evidence that distal carboxyl-terminal tail (C-tail), but not proximal, phosphorylation of the chemokine receptor CXCR4 specifies βarrestin1 (βarr1)-dependent signaling. We demonstrate by pharmacologic inhibition of GRK2/3-mediated phosphorylation of the chemokine receptor CXCR4 coupled with site-directed mutagenesis and bioluminescence resonance energy transfer approaches that distal, not proximal, C-tail phosphorylation sites are required for recruitment of the adaptor protein STAM1 (signal-transducing adaptor molecule) to βarr1 and focal adhesion kinase phosphorylation but not extracellular signal-regulated kinase 1/2 phosphorylation. In addition, we show that GPCRs that have similarly positioned C-tail phosphoresidues are also able to recruit STAM1 to βarr1. However, although necessary for some GPCRs, we found that distal C-tail sites might not be sufficient to specify recruitment of STAM1 to βarr1 for other GPCRs. In conclusion, this study provides evidence that distal C-tail phosphorylation sites specify GRK-βarrestin-mediated signaling by CXCR4 and other GPCRs." Read more at the source #DrGPCR #GPCR #IndustryNews

September 2022 "The GPR15 receptor is a G protein-coupled receptor (GPCR), which is activated by an endogenous peptide GPR15L(25-81) and a C-terminal peptide fragment GPR15L(71-81). GPR15 signals through the Gi/o pathway to decrease intracellular cyclic adenosine 3',5'-monophosphate (cAMP). However, the activation profiles of the GPR15 receptor within Gi/o subtypes have not been examined. Moreover, whether the receptor can also couple to Gs , Gq/11 and G12/13 is unclear. Here, GPR15L(25-81) and GPR15L(71-81) are used as pharmacological tool compounds to delineate the GPR15 receptor-mediated Gα protein signalling using a G protein activation assay and second messenger assay conducted on living cells. The results show that the GPR15 receptor preferentially couples to Gi/o rather than other pathways in both assays. Within the Gi/o family, the GPR15 receptor activates all the subtypes (Gi1 , Gi2 , Gi3 , GoA , GoB and Gz ). The Emax and activation rates of Gi1, Gi2 , Gi3, GoA and GoB are similar, whilst the Emax of Gz is smaller and the activation rate is significantly slower. The potencies of both peptides toward each Gi/o subtype have been determined. Furthermore, the GPR15 receptor signals through Gi/o to inhibit cAMP accumulation, which could be blocked by the application of the Gi/o inhibitor pertussis toxin." Read more at the source #DrGPCR #GPCR #IndustryNews

Samantha Rea , Ian Mills , Maya S Silver , Jovanni D Ahmad , Konstantin G Birukov , Anna Birukova , Henry Brem , Betty Tyler , Eli E Bar , Charles C Hong Source Contribute to the GPCR News Coming soon Become

Caroline Gorvin is a Wellcome Trust & Royal Society Sir Henry Dale Fellow at the Institute of Metabolism

Approach for Drug Discovery for Human Adhesion GPCRs Stephanie Häfner bioSens-All: A Multiparametric BRET-Based Discovery Laurent Sabbagh Characterizing hADGRE5/CD97 Activation and Signaling: A Mechanical Stimulation BRET-Based Approach (MS-BRET) Ana Lilia Moreno Salinas The NTF Release Sensor Approach for Drug Discovery for Human Stephanie Häfner on the web LinkedIn Scholz Lab Langenhan Lab bioSens-All: A Multiparametric BRET-Based Approach (MS-BRET) Ana Lilia Moreno Salinas Abstract Only available for AGPCR 24 Attendees Authors &