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Interactions with and Membrane Permeabilization of Brain Mitochondria by Amyloid Fibrils
Published on: September 28, 2019
Analyzing thioflavin T binding to amyloid fibrils by an equilibrium microdialysis-based technique
Irina M Kuznetsova1, Anna I Sulatskaya, Vladimir N Uversky
1Laboratory of Structural Dynamics, Stability and Folding of Proteins, The Institute of Cytology, Russian Academy of Sciences, St Petersburg, Russia.
Plos One
|March 3, 2012
Summary
A novel method quantifies amyloid fibril binding parameters using thioflavin T (ThT) dye. This technique determines binding modes, stoichiometry, and constants, offering new insights into dye-receptor interactions.
Area of Science:
- Biochemistry
- Spectroscopy
- Biophysical Chemistry
Background:
- Amyloid fibrils are implicated in neurodegenerative diseases.
- Thioflavin T (ThT) is a common dye used to detect amyloid fibrils.
- Accurate determination of ThT binding parameters is crucial for understanding fibril formation and detection.
Purpose of the Study:
- To develop a new, universal approach for determining amyloid fibril-thioflavin T (ThT) binding parameters.
- To characterize the spectral properties and binding modes of ThT bound to amyloid fibrils.
- To establish a method applicable to other dye-receptor interactions.
Main Methods:
- Equilibrium microdialysis to prepare solutions with free and bound dye.
- Absorption spectroscopy to determine dye concentrations.
- Analysis of spectral data to derive binding parameters.
Main Results:
- A novel approach for determining ThT-amyloid fibril binding parameters (number of binding modes, stoichiometry, binding constants) was established.
- For the first time, the absorption spectrum, molar extinction coefficient, and fluorescence quantum yield of ThT bound to fibrils were determined for each binding mode.
- The method demonstrated universality for various dye-receptor interactions.
Conclusions:
- The proposed method provides a comprehensive characterization of ThT binding to amyloid fibrils.
- This technique offers unprecedented insights into the molecular interactions between dyes and amyloid aggregates.
- The universality of the approach suggests broad applicability in biophysical studies of molecular binding.
