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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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Updated: Jul 11, 2025

Automated Two-dimensional Spatiotemporal Analysis of Mobile Single-molecule FRET Probes

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Published on: November 23, 2021

Time-resolved live-cell spectroscopy reveals EphA2 multimeric assembly.

Xiaojun Shi^1,2, Ryan Lingerak^1,3, Cameron J Herting⁴

¹Division of Cancer Biology, Department of Medicine, MetroHealth Medical Center, Cleveland, OH 44109, USA.

Science (New York, N.Y.)

|November 16, 2023

Summary

This summary is machine-generated.

Ephrin type-A receptor 2 (EphA2) forms multimers through distinct interactions, dictating its dual role in cancer. Understanding these EphA2 assembly mechanisms is key to targeting its oncogenic functions.

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Published on: December 11, 2021

Area of Science:

Molecular and Cellular Biology
Cancer Research
Biophysics

Background:

Ephrin type-A receptor 2 (EphA2) is a receptor tyrosine kinase.
EphA2 exhibits dual signaling roles: tumor-suppressive and oncogenic.
Ligand-free EphA2 interactions drive its complex functions.

Purpose of the Study:

To elucidate the molecular interactions governing EphA2 multimerization.
To understand how EphA2 assembly dictates its opposing roles in cancer.

Main Methods:

Time-resolved, live-cell fluorescence spectroscopy.
Analysis of intermolecular interactions in the EphA2 ectodomain.

Main Results:

Identified two types of intermolecular interactions in ligand-free EphA2 ectodomain assembly.
Symmetric interactions mediate tumor suppression by inhibiting ERK and AKT signaling.
Asymmetric interactions promote oncogenic signaling, cell migration, and tumor invasiveness.

Conclusions:

EphA2 multimerization is driven by specific intermolecular interactions.
The type of EphA2 assembly dictates its function in oncogenesis.
Targeting EphA2 assembly offers a potential strategy for cancer therapy.