The use of spin-labeled ligands as biophysical probes to report real-time endocytosis of G protein-coupled receptors in living cells.

Aaron Shafer, John C Voss

Research output: Contribution to journalArticle

2 Scopus citations

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.

Original languageEnglish (US)
JournalScience's STKE : signal transduction knowledge environment
Volume2004
Issue number232
StatePublished - 2004
Externally publishedYes

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