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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: Aug 26, 2025

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell

Fluorescence Biomembrane Force Probe: Concurrent Quantitation of Receptor-ligand Kinetics and Binding-induced Intracellular Signaling on a Single Cell

Published on: August 4, 2015

Multivalent binding kinetics resolved by fluorescence proximity sensing.

Clemens Schulte¹, Alice Soldà², Sebastian Spänig³

¹Rudolf Virchow Center, Center for Integrative and Translational Bioimaging, University of Wuerzburg, Josef-Schneider-Str. 2, Germany, 97080, Wuerzburg, Germany.

Communications Biology

|October 7, 2022

Summary

This summary is machine-generated.

Fluorescence proximity sensing (FPS) enables efficient kinetic and thermodynamic optimization of multivalent peptide inhibitors. This method accelerates the development of novel pharmaceutical strategies by improving protein binding analysis with reduced sample consumption.

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Last Updated: Aug 26, 2025

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Area of Science:

Biochemistry
Molecular Biology
Pharmacology

Background:

Multivalent protein interactors are crucial for understanding protein function and developing new pharmaceuticals.
Current methods for developing multivalent binders face limitations in throughput, precision, surface immobilization, fluorescent labeling, and sample consumption.

Purpose of the Study:

To apply Fluorescence Proximity Sensing (FPS) for optimizing multivalent peptide architectures targeting the gephyrin protein.
To systematically analyze the kinetics and thermodynamics of engineered multivalent binders.

Main Methods:

High-throughput synthesis of over 100 peptide architectures (dimeric, tetrameric, octameric).
Direct measurement of binding kinetics (on-rates, off-rates) and thermodynamics (dissociation constants) using FPS.
Machine learning analysis of the generated dataset.

Main Results:

FPS achieved high accuracy and low sample consumption compared to three other technologies.
The study identified specific architectural features correlating with binding kinetics.
Novel multivalent inhibitors with significant protein inhibition capacity were discovered.

Conclusions:

FPS is a valuable tool for the rational engineering of multivalent inhibitors.
This approach enhances the development of pharmaceutical strategies by improving the efficiency and precision of binder optimization.