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Updated: May 29, 2026

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
Published on: January 2, 2015
Thioflavin T forms a non-fluorescent complex with α-helical poly-L-glutamic acid.
Viktoria Babenko1, Wojciech Dzwolak
1Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
Thioflavin T (ThT) dye binds orderly to alpha-helical structures, challenging the necessity of beta-sheets for protein interactions. This finding expands understanding of ThT
Area of Science:
- Biochemistry
- Biophysics
- Molecular Biology
Background:
- Thioflavin T (ThT) is a widely used fluorophore for detecting amyloid fibrils.
- Amyloid fibril detection typically relies on ThT's specific binding to beta-sheet structures.
- The precise molecular interactions governing ThT binding are not fully elucidated.
Purpose of the Study:
- To investigate the binding mechanism of Thioflavin T (ThT) beyond amyloid structures.
- To determine if ThT binding requires the presence of beta-sheet conformations.
- To explore ThT's interaction with non-amyloid protein structures.
Main Methods:
- Utilized induced circular dichroism spectroscopy.
- Studied the interaction between Thioflavin T (ThT) and poly-L-glutamic acid (PLGA) in its alpha-helical conformation.
Main Results:
- Demonstrated that Thioflavin T (ThT) binds in an orderly fashion to alpha-helical poly-L-glutamic acid (PLGA).
- Provided evidence that stacked beta-sheets are not essential for ThT binding to proteins.
- Indicated that pi-pi stacking interactions are not a prerequisite for ThT-protein complex formation.
Conclusions:
- Thioflavin T (ThT) binding is not exclusively dependent on beta-sheet structures.
- The dye can interact with proteins adopting alpha-helical conformations.
- This broadens the scope of ThT as a potential probe for various protein structures.
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