Single-Molecule DNA Hybridization on Tetrahedral DNA Framework-Modified Surfaces.

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• Tetrahedral DNA frameworks (TDFs) are widely used in biosensing.
• TDFs enhance DNA hybridization efficiency at the solid-liquid interface.
• Molecular mechanisms of TDF-mediated hybridization are not fully understood.

Purpose of the Study:

• To investigate the molecular mechanisms by which TDF scaffolds influence interfacial DNA hybridization.
• To quantify the effect of TDFs on hybridization kinetics and thermodynamics.

Main Methods:

• Single-molecule total internal reflection fluorescence microscopy (SM-TIRFM) was used.
• Hybridization kinetics of target ssDNA with probe ssDNA were monitored with and without TDF scaffolds.
• Statistical analysis of single-probe site hybridization events was performed.

Main Results:

• TDF scaffolds significantly accelerated interfacial DNA hybridization kinetics.
• Target dissociation time was reduced by 0.5-fold in the presence of TDFs.
• The association constant (Ka) for hybridization increased nearly 4-fold with TDF scaffolds.

Conclusions:

• TDF scaffolds enhance interfacial DNA hybridization by accelerating kinetics and improving binding affinity.
• This study provides molecular-level insights into TDF function in biosensing.
• Findings support the development of advanced DNA nanostructure-based biosensors.