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Related Concept Videos

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Updated: Jun 20, 2025

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Self-Blinking Thioflavin T for Super-resolution Imaging.

Qiqi Yang1, Elnaz Hosseini1, Peigen Yao1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

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|July 19, 2024
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This summary is machine-generated.

Thioflavin T (ThT) dye exhibits inherent stochastic blinking for single-molecule super-resolution imaging, contrary to prior beliefs. This property enables visualization of amyloid fibrils without specialized buffers.

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Area of Science:

  • Biophysics
  • Chemical biology
  • Microscopy

Background:

  • Thioflavin T (ThT) is a standard dye for detecting amyloid and peptide nanofibrils.
  • ThT is generally considered to have stable fluorescence upon binding aggregated proteins.
  • Single-molecule localization microscopy (SMLM) requires photoswitching/blinking properties for super-resolution imaging.

Purpose of the Study:

  • To investigate the intrinsic photoswitching/blinking properties of ThT at the single-molecule level.
  • To determine if ThT can be used for SMLM without specialized blinking buffers.
  • To characterize ThT's blinking behavior under various experimental conditions.

Main Methods:

  • Single-molecule spectroscopy to analyze ThT fluorescence.
  • Investigation of ThT blinking properties (photon count, duration, on-off ratio) at ultralow concentrations.
  • SMLM imaging of ThT-labeled α-synuclein fibrils in air and PBS buffer.

Main Results:

  • ThT demonstrates intrinsic stochastic blinking in stable binding conditions, contradicting previous assumptions.
  • Blinking characteristics of ThT were quantified at the single-molecule level.
  • Successful SMLM imaging of α-synuclein fibrils was achieved using ThT.

Conclusions:

  • ThT possesses inherent photoswitching capabilities suitable for SMLM.
  • Specialized blinking buffers are unnecessary for ThT-based SMLM of amyloid structures.
  • This finding expands the utility of ThT in super-resolution microscopy of protein aggregates.