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Sci. STKE, 11 May 2004
Vol. 2004, Issue 232, p. pl9
[DOI: 10.1126/stke.2322004pl9]

PROTOCOLS

The Use of Spin-Labeled Ligands as Biophysical Probes to Report Real-Time Endocytosis of G ProteinCoupled Receptors in Living Cells

Aaron Shafer1 and John Voss2*

1 Stanford University Medical Center, Department of Molecular and Cellular Physiology, 157 Beckman Center, 279 Campus Drive, Stanford, CA 94305, USA.
2 UC Davis School of Medicine, Department of Biological Chemistry, 4306 Tupper Hall, University of California, Davis, One Shields Avenue, Davis, CA 956168635, USA.

Abstract: Recycling and degradation of plasma membrane receptors and transporters are fundamental mechanisms for regulating cell signaling and metabolic processes. For many membrane proteins, endocytosis reduces the number of molecules available for transport or signal transduction, providing an attenuation response. Fluorescent reporters attached to either the receptor or ligand have been used to monitor the trafficking of internalization; however, these approaches provide poor resolution for the early endocytic response. Here, we describe the use of a spin-labeled ligand for a heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptor for measuring the kinetics of endocytosis in real time. Included are protocols for designing a nitroxide-labeled ligand and measuring receptor endocytosis in live cells using electron paramagnetic resonance (EPR) spectroscopy. Methods for the evaluation of the receptor binding and activation properties of modified ligands and the generation of a cell line stably expressing high receptor levels are also provided.

*Corresponding author. E-mail, jcvoss{at}ucdavis.edu

Citation: A. Shafer, J. Voss, The Use of Spin-Labeled Ligands as Biophysical Probes to Report Real-Time Endocytosis of G ProteinCoupled Receptors in Living Cells. Sci. STKE 2004, pl9 (2004).

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