Hindering tau fibrillization by disrupting transient precursor clusters

Area of Science:

• Neuroscience and protein aggregation research.

Background:

• Tau protein aggregation is central to Alzheimer's disease (AD) pathogenesis.
• Early-stage tau fibril formation is critical for therapeutic development.
• The role of transient tau-protein clusters in fibrillization was previously unclear.

Purpose of the Study:

• To investigate the functional role of Thioflavin T-inactive tau clusters.
• To determine if these clusters are obligatory precursors in tau fibrillization.
• To explore the potential for targeting these clusters therapeutically.

Main Methods:

• Utilized small-angle X-ray scattering (SAXS) to analyze tau structures.
• Employed Thioflavin T (ThT) fluorescence to monitor fibril formation.
• Investigated the effect of disrupting clusters using NaCl addition.

Main Results:

• Transient tau clusters were confirmed as obligatory precursors in the fibrillization pathway.
• Disrupting these precursor clusters with NaCl addition significantly hindered tau fibril formation.
• The reversibility and targetability of these clusters were demonstrated.

Conclusions:

• Tau fibril formation proceeds through essential, reversible precursor clusters.
• These findings offer a new therapeutic target for Alzheimer's disease.
• Similar physical principles may govern the aggregation of other intrinsically disordered proteins, like alpha-synuclein.