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Related Experiment Video

Updated: Jul 16, 2025

In Vitro Assay for Studying the Aggregation of Tau Protein and Drug Screening
09:49

In Vitro Assay for Studying the Aggregation of Tau Protein and Drug Screening

Published on: November 20, 2018

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Precision Proteoform Design for 4R Tau Isoform Selective Templated Aggregation.

Andrew P Longhini1,2, Austin DuBose3, Samuel Lobo4

  • 1Neuroscience Research Institute, University of California Santa Barbara, Santa Barbara, California, USA.

Biorxiv : the Preprint Server for Biology
|September 11, 2023
PubMed
Summary

Tau fibrils propagate tauopathies by selectively seeding 4R tau aggregation. Specific amino acid changes in tau isoforms significantly alter this seeding process, suggesting targeted therapeutic strategies for tauopathies.

Keywords:
Amyloidogenic CoreBiological SciencesNeurosciencePrion-Like TemplatingProtein MisfoldingTauopathies

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Related Experiment Videos

Last Updated: Jul 16, 2025

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In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Prion-like spread of tau conformers is characteristic of tauopathies.
  • Understanding tau isoform-specific aggregation is crucial for disease mechanisms.

Approach:

  • A 19-residue tau peptide probe with a P301L mutation was designed to mimic seeding-competent fibrils.
  • Replica exchange molecular dynamics (MD) simulations were employed to analyze peptide monomer conformational ensembles.
  • Site-directed mutagenesis was used to investigate the role of specific amino acid residues in tau seeding.

Key Points:

  • The tau peptide probe forms U-shaped fibrils that selectively seed 4R tau aggregation, not 3R tau.
  • MD simulations revealed distinct aggregation-competent (U-fold) and aggregation-inhibiting (β-hairpin) structures.
  • A single amino acid substitution (S305K) significantly reduced seeding, while mimicking 4R tau features restored it.
  • These peptide fibrils act as partial prions, templating the aggregation of longer 4R tau species.

Conclusions:

  • The structural and sequence features of tau influence its seeding propensity and isoform selectivity.
  • Targeting tau isoform-specific interactions offers a promising avenue for developing tauopathy therapeutics.