A molecular tuning fork in single-molecule mechanochemical sensing

Area of Science:

• Biotechnology
• Molecular Biology
• Nanotechnology

Background:

• Conventional biosensors face challenges with real-time response and noise due to separate target recognition and signal transduction.
• Developing integrated systems for analyte recognition and signal reporting is crucial for improved biosensing.

Purpose of the Study:

• To develop a novel biosensing platform by combining analyte recognition and signal reporting through mechanochemical coupling.
• To create a single-molecule DNA template device, termed a molecular tuning fork (MTF), for real-time analysis of biomolecular binding events.

Main Methods:

• Incorporation of a DNA hairpin as a mechanophore within a single-molecule DNA template.
• Utilizing mechanochemical coupling for stochastic transitions (mechanoescence) in the DNA hairpin under force.
• Monitoring hairpin structure lifetimes to differentiate binding modes during individual antibody-antigen interactions.

Main Results:

• Demonstrated a molecular tuning fork (MTF) device capable of real-time biosensing.
• Successfully differentiated between mono- and bivalent antibody-antigen binding modes.
• Established a method for analyzing individual binding events using hairpin structure dynamics.

Conclusions:

• The developed MTF biosensor offers a novel approach to overcome limitations of conventional biosensors.
• Mechanospectroscopic methods provide a powerful tool for analyzing biomolecular interactions at the single-molecule level.
• This technology holds promise for the advancement of novel bioanalytical techniques.