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Updated: Aug 23, 2025

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein

Published on: January 2, 2015

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An Additive-Free Model for Tau Self-Assembly

Youssra K Al-Hilaly1,2, Karen E Marshall3, Liisa Lutter4,5

  • 1Chemistry Department, College of Science, Mustansiriyah University, Baghdad, Iraq. youssra.alhilaly@uomustansiriyah.edu.iq.

Methods in Molecular Biology (Clifton, N.J.)
|October 31, 2022
PubMed

Insights

Researchers developed methods to create tau protein filaments in vitro, crucial for studying Alzheimer's disease (AD) pathology. This work provides a new model system for investigating tau misfolding and self-assembly in AD.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Tau protein is essential for microtubule stability.
  • Misfolded tau protein self-assembles into filaments (PHFs and SFs) in Alzheimer's disease (AD).
  • Full-length tau assembly is limited in vitro without additives like heparin.

Purpose of the Study:

  • To describe methods for preparing in vitro paired helical filaments (PHFs) and straight filaments (SFs) from a truncated tau protein (297-391), named dGAE.
  • To establish an alternative in vitro PHF model system.
  • To discuss techniques for monitoring tau filament assembly and structure.

Main Methods:

  • Utilized a truncated tau protein (297-391) for self-assembly.
  • Developed methods to prepare in vitro PHFs and SFs.
  • Employed various biophysical and biochemical techniques to analyze filament assembly and structure.

Main Results:

  • Successfully prepared in vitro PHFs and SFs from the truncated tau protein (dGAE) without additives.
  • Demonstrated the self-assembly capability of the truncated tau form.
  • Established a novel in vitro model system for tau filament formation.

Conclusions:

  • The truncated tau protein (dGAE) provides a valuable tool for studying tauopathies like AD.
  • The developed methods facilitate the investigation of tau self-assembly mechanisms.
  • Further research can utilize these in vitro models to explore therapeutic strategies for AD.
Keywords:
Atomic force microscopyCircular dichroismCross-betaElectron microscopyPaired helical filamentSelf-assemblyTauThioflavin S fluorescenceTyrosine fluorescenceX-ray fibre diffraction

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