Fixed DNA Molecule Arrays for High-Throughput Single DNA-Protein Interaction Studies

Area of Science:

• Molecular Biology
• Nanotechnology
• Biophysics

Background:

• The DNA Curtains assay is a single-molecule technique for studying protein-DNA interactions.
• Current DNA Curtains methods using chromium barriers and lipid bilayers are technically challenging and unstable.
• A need exists for more stable and accessible platforms for DNA-protein interaction analysis.

Purpose of the Study:

• To develop an alternative, stable DNA arraying strategy for individual DNA-protein interaction analysis.
• To create a facile fabrication method for nanoscale DNA platforms.
• To enable advanced functional studies of DNA machineries and nanodevices.

Main Methods:

• Fabrication of streptavidin templates (200 nm lines) on glass coverslips using surface chemistry, atomic force microscopy (AFM), and soft lithography.
• Affinity-driven assembly for stable DNA tethering onto nanopatterned protein templates.
• Characterization of molecular architecture and DNA binding using AFM and total internal reflection fluorescence microscopy (TIRFM).

Main Results:

• Successfully arrayed single- and double-tethered DNA strands, including short DNA and lambda DNA.
• Demonstrated the feasibility of the DNA molecule arrays for protein-DNA interaction studies.
• Showcased suitability for localizing single DNA-protein interactions using restriction endonucleases.

Conclusions:

• A stable and facile method for fabricating nanoscale DNA arrays was developed.
• The new platform does not require cleanroom equipment, enhancing accessibility.
• The developed platform supports advanced functional studies of DNA-protein interactions and nanodevice development.