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Updated: Dec 22, 2025

Using an α-Bungarotoxin Binding Site Tag to Study GABA A Receptor Membrane Localization and Trafficking

Using an α-Bungarotoxin Binding Site Tag to Study GABA A Receptor Membrane Localization and Trafficking

Published on: March 28, 2014

Visualizing GABA A Receptor Trafficking Dynamics with Fluorogenic Protein Labeling.

Jacob P Lombardi¹, David A Kinzlmaier¹, Tija C Jacob¹

¹Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.

Current Protocols in Neuroscience

|May 5, 2020

Summary

This summary is machine-generated.

Researchers developed novel optical methods to track GABA A receptor (GABAAR) trafficking dynamics. This technique quantifies receptor movement from the cell surface to intracellular compartments, aiding neuroscience research.

Keywords:

GABA A receptor endocytosis fluorogen lysosome neurons pHluorin seizure trafficking

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High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy

High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy

Published on: July 25, 2014

Area of Science:

Neuroscience
Cell Biology
Biochemistry

Background:

Neurotransmitter receptors, like GABA A receptors (GABAARs), display dynamic cell surface mobility.
Surface trafficking is crucial for regulating GABAAR neurotransmission.
Receptor trafficking involves exocytosis, lateral diffusion, synaptic tethering, and clathrin-dependent endocytosis.

Purpose of the Study:

To develop and present novel optical methods for studying GABAAR trafficking dynamics in neurons.
To enable accurate quantification of receptor turnover and intracellular accumulation.
To provide a protocol for measuring receptor surface levels and postendocytic trafficking decisions.

Main Methods:

Development of dual-tagged GABAAR γ2 subunit (γ2pHFAP) incorporating pH-sensitive GFP and a fluorogen-activating peptide (FAP).
Utilizing FAP for labeling with optically silent fluorogen dyes, activated upon binding.
Combining FAP imaging with organelle labeling for tracking receptors from surface to intracellular compartments.

Main Results:

The developed optical methods allow for novel and accurate measurement of GABAAR turnover.
Quantification of receptor accumulation into intracellular compartments under basal and experimental conditions.
The protocol facilitates rapid, quantitative measurements of receptor surface levels and trafficking pathways.

Conclusions:

The novel optical methods provide a powerful tool for studying GABAAR trafficking dynamics.
This protocol is applicable to various cell types, including primary neurons and cell lines.
Enables detailed analysis of receptor trafficking in response to physiological and pharmacological stimuli.