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Updated: Feb 18, 2026
In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
Published on: January 2, 2015
Discovery and characterization of stable and toxic Tau/phospholipid oligomeric complexes
Nadine Ait-Bouziad1, Guohua Lv2, Anne-Laure Mahul-Mellier1
1Laboratory of Molecular and Chemical Biology of Neurodegeneration, Station 19, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
Abstract:
The microtubule-associated protein Tau plays a central role in the pathogenesis of Alzheimer's disease. Although Tau interaction with membranes is thought to affect some of its physiological functions and its aggregation properties, the sequence determinants and the structural and functional consequences of such interactions remain poorly understood. Here, we report that the interaction of Tau with vesicles results in the formation of highly stable protein/phospholipid complexes. These complexes are toxic to primary hippocampal cultures and are detected by MC-1, an antibody recognizing pathological Tau conformations. The core of these complexes is comprised of the PHF6* and PHF6 hexapeptide motifs, the latter in a β-strand conformation. Studies using Tau-derived peptides enabled the design of mutants that disrupt Tau interactions with phospholipids without interfering with its ability to form fibrils, thus providing powerful tools for uncoupling these processes and investigating the role of membrane interactions in regulating Tau function, aggregation and toxicity.
Insights
Tau protein interactions with cell membranes form toxic complexes, contributing to Alzheimer's disease pathogenesis. Researchers identified key Tau motifs involved and developed mutants to study these interactions.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- The microtubule-associated protein Tau is implicated in Alzheimer's disease pathogenesis.
- Tau's interaction with membranes is suspected to influence its function and aggregation, but details are unclear.
Purpose of the Study:
- To investigate the sequence determinants and consequences of Tau-membrane interactions.
- To understand how Tau-phospholipid complexes form and their toxicity.
Main Methods:
- Studied Tau interaction with vesicles to form protein/phospholipid complexes.
- Utilized MC-1 antibody to detect pathological Tau conformations.
- Employed Tau-derived peptides and designed mutants to disrupt membrane interactions.
Main Results:
- Tau forms highly stable complexes with vesicles.
- These complexes are toxic to primary hippocampal cultures.
- The PHF6* and PHF6 hexapeptide motifs are central to these complexes, with PHF6 in a β-strand conformation.
Conclusions:
- Tau-membrane interactions are mediated by specific hexapeptide motifs.
- Disrupting these interactions can be achieved without preventing Tau fibril formation.
- This research provides tools to decouple membrane interactions from fibril formation for further study of Tau's role in disease.
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