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Updated: Jun 19, 2026

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
09:22

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein

Published on: January 2, 2015

Coaggregation with Aβ Drives β-Sheet Formation in tau Microtubule-Binding Repeats

Fengjuan Huang1, Yuying Liu2, Yiran Wang2

  • 1Ningbo Institute of Innovation for Combined Medicine and Engineering, the Affiliated LiHuiLi Hospital of Ningbo University, Ningbo 315211, China.

Biomacromolecules
|June 18, 2026
PubMed

Insights

Alzheimer's disease involves amyloid-β (Aβ) and tau protein clumps. This study reveals how Aβ promotes tau aggregation at a molecular level, offering new insights into early Alzheimer's disease pathology.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Computational Biology

Background:

  • Alzheimer's disease (AD) pathology involves amyloid plaques and neurofibrillary tangles composed of amyloid-β (Aβ) and tau aggregates.
  • The molecular mechanisms driving the coaggregation of Aβ and tau remain largely unknown.

Purpose of the Study:

  • To investigate the molecular basis of tau protein homodimerization and its heterodimerization with amyloid-β (Aβ).
  • To elucidate the role of Aβ in promoting tau aggregation and β-sheet formation.

Main Methods:

  • Utilized microsecond-scale discrete molecular dynamics simulations to model peptide interactions.
  • Performed residue-level analyses and thermodynamic analyses to understand aggregation propensities and mechanisms.

Main Results:

  • Tau repeats R1, R2, and R4 showed weak homodimerization, but significantly enhanced aggregation and β-sheet formation upon heterodimerization with Aβ.
  • Tau repeat R3 demonstrated strong intrinsic aggregation propensity, further stabilized by Aβ interaction into β-sheet-rich structures.
  • Identified specific Aβ regions (Aβ11-21 and Aβ30-41) as structural templates inducing β-sheet transitions in tau.
  • Thermodynamic analysis revealed an energy-entropy compensation mechanism stabilizing Aβ-tau coaggregated states.

Conclusions:

  • Aβ actively facilitates tau coaggregation by promoting β-sheet formation and stabilizing these structures through an energy-entropy compensation mechanism.
  • These findings provide atomistic insights into the early stages of Alzheimer's disease pathology, specifically the interplay between Aβ and tau.
  • The study highlights potential therapeutic targets by revealing key molecular interactions driving pathogenic protein aggregation.

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