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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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Detection of Protein Aggregation using Fluorescence Correlation Spectroscopy
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Detection of Protein Aggregation using Fluorescence Correlation Spectroscopy.

Akira Kitamura1, Ai Fujimoto2, Masataka Kinjo2

  • 1Laboratory for Molecular Cell Dynamics, Faculty of Advanced Life Science, Hokkaido University; akita@sci.hokudai.ac.jp.

Journal of Visualized Experiments : Jove
|May 10, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a standard fluorescence correlation spectroscopy (FCS) method to detect protein aggregation in neurodegenerative diseases. The technique analyzes diffusion properties of aggregation-prone proteins like TDP25 and SOD1 in cell lysates and live cells.

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Characterizing Individual Protein Aggregates by Infrared Nanospectroscopy and Atomic Force Microscopy
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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Protein aggregation is a key feature of neurodegenerative diseases, including ALS, AD, PD, and HD.
  • Detecting soluble protein oligomers and aggregates is crucial for understanding disease mechanisms.
  • Standardized methods for protein aggregation detection using fluorescence correlation spectroscopy (FCS) are lacking.

Purpose of the Study:

  • To establish a standard procedure for using FCS to detect protein aggregation.
  • To analyze the diffusion properties of aggregation-prone proteins in cellular environments.
  • To provide a reliable method for studying neurodegenerative disease-related proteinopathies.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) to measure diffusion properties of single molecules.
  • Applied FCS to analyze aggregation-prone proteins, specifically TDP25 and SOD1, in cell lysates and live cells.
  • Employed green fluorescent protein (GFP) tagging for protein visualization and tracking.

Main Results:

  • Demonstrated that a portion of GFP-tagged TDP25 aggregates was present in the soluble fraction of cell lysate.
  • Observed slower diffusion of GFP-tagged SOD1 with an ALS-associated mutation in live cells, indicating aggregation.
  • Successfully applied FCS to differentiate diffusion characteristics related to protein aggregation.

Conclusions:

  • FCS provides a sensitive method for detecting and characterizing protein aggregation.
  • The established procedure enables the study of diffusion properties of aggregation-prone proteins in complex biological samples.
  • This technique can aid in understanding the molecular basis of neurodegenerative disorders and in developing diagnostic tools.