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Protein Dynamics in Living Cells

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Related Experiment Video

Updated: Jun 8, 2026

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

Fluorescent Peptide Tracers for Simultaneous Oxytocin Receptor Activation and Visualization.

Monika Perisic Böhm^1,2, Predrag Kalaba¹, Rachel S Gormal³

¹Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Vienna, Austria.

Angewandte Chemie (International Ed. in English)

|September 26, 2025

Summary

This summary is machine-generated.

Researchers developed novel fluorescent peptide tracers for the oxytocin receptor (OTR). These tools enable precise imaging and functional studies of OTR, advancing research into OTR

Keywords:

Bioactive peptide tracers Imaging Immunocytochemistry Oxytocin receptor visualization Structure–activity relationship (SAR) study

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Last Updated: Jun 8, 2026

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Area of Science:

Neuroscience
Molecular Biology
Biochemistry

Background:

The oxytocin receptor (OTR) plays a crucial role in physiological functions and is linked to diseases like autism spectrum disorder.
Existing molecular tools for studying OTR are limited, hindering research into its roles in health and disease.

Purpose of the Study:

To develop novel, reliable molecular tools for investigating oxytocin receptor (OTR) function and localization.
To create fluorescent peptide tracers for precise spatial and functional analysis of OTR actions.

Main Methods:

Development of potent, selective, and bright fluorescent peptide tracers based on oxytocin.
Testing tracers in cellular bioassays (live and fixed cells, overexpression and primary systems).
Utilizing live-cell super-resolution microscopy for single-molecule tracking and fluorescence-activated cell sorting (FACS).

Main Results:

Fluorescent tracers demonstrated efficient OTR labeling, activation, and internalization in various cell systems.
Tracers are compatible with immunocytochemical protocols, showing versatility for imaging.
Single-molecule tracking and FACS successfully analyzed OTR dynamics and cell populations.

Conclusions:

Novel fluorescent tracers provide versatile tools for both live-cell and post-hoc imaging of OTR.
These tracers offer functional capabilities beyond traditional methods, enabling new research avenues.
The developed tools will advance the understanding of OTR's role in physiological processes and diseases.