High-Speed Atomic Force Microscopy Visualization of Protein-DNA Interactions Using DNA Origami Frames.

Area of Science:

• Molecular Biology
• Biophysics
• Nanotechnology

Background:

• Understanding protein-DNA interactions is crucial for gene regulation.
• Direct imaging of these interactions under physiological conditions is challenging.
• Transcription factors play key roles in controlling gene expression.

Purpose of the Study:

• To develop a novel method for direct, live imaging of transcription factor-DNA binding dynamics.
• To investigate the mechanism of action of the transcription factor FadR.
• To utilize DNA origami technology for precise molecular arrangement.

Main Methods:

• Self-assembly of DNA origami frames.
• Incorporation of specific DNA sequences with transcription factor binding sites.
• High-speed Atomic Force Microscopy (HS-AFM) for live imaging.
• Studying the TetR-family transcription factor FadR from Sulfolobus acidocaldarius.

Main Results:

• Successful self-assembly of DNA origami frames capable of holding stretched DNA sequences.
• Demonstration of the protocol for studying transcription factor binding dynamics.
• Obtained preliminary data on FadR-DNA interactions.

Conclusions:

• DNA origami frames provide a powerful platform for studying protein-DNA interactions in real-time.
• This approach enables mechanistic insights into transcription factor binding and function.
• The method is applicable to various transcription factors and DNA-binding proteins.