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Updated: Apr 18, 2026
Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
Published on: September 13, 2013
Monitoring G protein-coupled receptor activation using the protein fragment complementation technique split TEV
Michael C Wehr1, Sabrina Galinski, Moritz J Rossner
1Molecular Neurobiology, Department of Psychiatry, Ludwig Maximilian University, Nußbaumstr. 7, 80336, Munich, Germany, Michael.Wehr@med.uni-muenchen.de.
Abstract:
G protein-coupled receptors (GPCRs) modulate cellular signaling, often in a ligand-specific manner. Cellular effects regulated include differentiation, proliferation, hormonal regulation, and neuronal activity. Further, they are involved in many disease-relevant processes, such as cancer and neurodevelopmental diseases, and represent the largest class of drug targets. Therefore, monitoring how GPCRs are regulated in their activity is crucial to understand their role in physiological processes and implications for drug development. Split TEV, a method based on TEV protease fragment complementation, can be used to sensitively assay GPCR activities in living cells. The activity of a given GPCR is monitored through its binding to β-arrestin. Split TEV reporters provide at minimum a two-step amplification process facilitating a flexible format and a robust readout. For the initial setup, a GPCR of interest and β-arrestin are fused to the N- and C-terminal fragments of the TEV protease, and occurred interactions are indicated by increased fluorescence or luminescence of TEV cleavage-dependent reporters. The experimental procedure takes 24-72 h to complete, depending on the cell type and complexity of the experimental setup applied.
Insights
Split TEV protease fragment complementation assays G protein-coupled receptor (GPCR) activity by monitoring β-arrestin binding. This sensitive method aids understanding GPCRs in health, disease, and drug development.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Pharmacology
Background:
- G protein-coupled receptors (GPCRs) are crucial cell signaling regulators involved in diverse physiological processes.
- GPCRs play roles in diseases like cancer and neurodevelopmental disorders, making them significant drug targets.
- Understanding GPCR activity regulation is vital for physiological insights and drug development.
Purpose of the Study:
- To introduce and validate Split TEV protease fragment complementation as a sensitive method for assaying GPCR activity.
- To monitor GPCR interactions with β-arrestin in living cells.
Main Methods:
- Utilized Split TEV, a technique based on TEV protease fragment complementation.
- Fused GPCRs and β-arrestin to N- and C-terminal fragments of TEV protease.
- Detected GPCR-β-arrestin interactions via fluorescence or luminescence reporters dependent on TEV cleavage.
Main Results:
- Split TEV enables sensitive detection of GPCR activity through β-arrestin binding.
- The method offers a two-step amplification for a robust readout.
- Experimental procedures are adaptable, taking 24-72 hours.
Conclusions:
- Split TEV is a versatile and sensitive tool for studying GPCR activity in living cells.
- This assay facilitates research into GPCRs' physiological roles and therapeutic potential.
- The method provides a robust platform for drug discovery targeting GPCRs.
