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Updated: Jun 7, 2026
16:16
Genetically-encoded Molecular Probes to Study G Protein-coupled Receptors
Published on: September 13, 2013
Methods to detect cell surface expression and constitutive activity of GPR6
Balakrishna M Prasad1, Bettye Hollins, Nevin A Lambert
1Department of Clinical Investigation, Eisenhower Army Medical Center, Georgia, USA.
Methods in Enzymology
|November 2, 2010
Summary
Researchers explored methods for studying G protein-coupled receptor 6 (GPR6) cell surface expression and constitutive activity. Proteolytic enzyme assays proved more effective than biotinylation for cell surface expression, while imaging assays accurately detected signaling in single cells.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- G protein-coupled receptor 6 (GPR6) is a constitutively active receptor signaling from intracellular compartments.
- Studying receptor expression and activity is crucial for understanding cellular signaling pathways.
Purpose of the Study:
- To compare methods for assessing GPR6 cell surface expression.
- To evaluate techniques for detecting constitutive activity in Gs-coupled receptors.
Main Methods:
- Comparison of cell surface biotinylation with methods based on susceptibility to proteolytic enzymes for receptor expression.
- Utilization of imaging-based assays for intracellular cyclic AMP (cAMP) accumulation to detect constitutive activity.
Main Results:
- Proteolytic enzyme susceptibility assays offer more efficient estimates of cell surface expression compared to cell surface biotinylation.
- Imaging assays effectively detect intracellular cAMP accumulation at a single-cell level, suitable for low-transfection efficiency cultures.
Conclusions:
- Proteolytic enzyme assays are advantageous for accurate cell surface expression quantification.
- Imaging-based cAMP assays provide valuable insights into single-cell signaling of constitutively active receptors like GPR6.
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