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Related Concept Videos

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Updated: Jan 10, 2026

Generation of Native, Untagged Huntingtin Exon1 Monomer and Fibrils Using a SUMO Fusion Strategy
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Tau4RD fibril polymorphism is imprinted during early aggregation.

Ellie I James1,2, Mason Saunders1, Kelly K Lee1

  • 1Department of Medicinal Chemistry, University of Washington, Seattle, WA.

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Researchers used pulsed hydrogen-deuterium exchange with mass spectrometry to study tau protein aggregation. This method revealed distinct structural differences in tau subpopulations during early aggregation, offering insights into neurodegenerative disease mechanisms.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Structural Biology

Background:

  • Microtubule-associated protein tau forms fibrillar species in neurodegenerative diseases.
  • Alzheimer's disease (AD) involves tau deposits like paired helical filaments (PHFs) and straight filaments.
  • Understanding tau aggregation intermediates is crucial for neurodegenerative disease research.

Purpose of the Study:

  • To investigate the early structural changes and polymorphism of tau during aggregation.
  • To differentiate between fibril polymorphism imprinted at nucleation versus later conformational conversion.
  • To explore methods for biasing tau aggregation toward less toxic states.

Main Methods:

  • Pulsed hydrogen-deuterium exchange with mass spectrometry (pulsed HDX-MS) was employed.
  • Studied tau aggregation intermediates and structural conversion.
  • Analyzed tau4RD (truncated tau) aggregation induced by polyphosphate and heparin.

Main Results:

  • Pulsed HDX-MS revealed differences in tau4RD subpopulations within seconds of polyphosphate induction.
  • Distinct structural differences were observed between tau subpopulations formed under different induction conditions (polyphosphate vs. heparin).
  • The study provides insights into the timing and mechanisms of amyloid polymorphism formation.

Conclusions:

  • Amyloid polymorphism in tau may arise from structural rearrangements during aggregation, not solely imprinted at nucleation.
  • Pulsed HDX-MS is a powerful tool for studying transient protein aggregation intermediates.
  • This research contributes to understanding the structural basis of tauopathies and potential therapeutic strategies.