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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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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: Apr 17, 2026

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time
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Simultaneous time-lamination imaging of protein association using a split fluorescent timer protein.

Ayari Takamura1, Mitsuru Hattori1, Hideaki Yoshimura1

  • 1†Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan.

Analytical Chemistry
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Summary

We developed a novel split fluorescent timer method to track protein aggregation over time in living cells. This technique visualizes dynamic protein assembly processes, aiding in understanding cellular coordination mechanisms.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Understanding temporal protein association dynamics is vital for cell activity.
  • Existing methods may lack the temporal resolution to capture dynamic protein assembly.
  • Fluorescent timers (FTs) offer a way to track time-dependent processes via color change.

Purpose of the Study:

  • To develop a method for investigating temporal changes in protein assemblies using split fluorescent timers.
  • To enable visualization and quantification of protein aggregation rates in living cells.
  • To apply this method to study the aggregation of alpha-synuclein.

Main Methods:

  • Developed split fluorescent timer (FT) fragments that regain fluorescence and temporal color change upon reassembly.
  • Identified a specific dissection site for FT complementation.
  • Applied the split FT system to visualize and analyze alpha-synuclein aggregation in living cells.

Main Results:

  • Demonstrated successful reassembly and functional complementation of split FT fragments in vitro.
  • Visualized the dynamic aggregation process of alpha-synuclein in living cells.
  • Quantified aggregation rates by analyzing the blue/red fluorescence ratios of reconstituted FTs.

Conclusions:

  • The split FT method allows for tracing and visualizing temporal alternations of protein associations.
  • This technique enables single fluorescence measurements for analyzing dynamic cellular processes.
  • The approach is applicable to studying various protein assembly dynamics, including disease-related aggregation.