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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...

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Related Experiment Video

Updated: Dec 27, 2025

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

Single-molecule dynamic DNA junctions for engineering robust molecular switches.

Shuang Cai¹, Yingnan Deng¹, Shengnan Fu¹

¹College of Life Science and Technology , Beijing University of Chemical Technology , Beijing 100029 , China .

Chemical Science

|February 29, 2020

Summary

This summary is machine-generated.

Engineered zero-leakage DNA molecular switches offer sensitive detection without amplification. These dynamic DNA junctions provide distinguishable kinetics-based outputs, enabling robust DNA circuits and biomolecule studies.

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Published on: August 15, 2018

Area of Science:

Molecular biology
Nanotechnology
Biochemistry

Background:

DNA molecular switches are programmable tools for sensing, diagnosis, and therapeutics.
Toehold mediated strand displacement is a key reaction but suffers from signal leakage.
Leakage limits the scalability and robustness of DNA-based circuits.

Purpose of the Study:

To engineer 'zero-leakage' molecular switches using single-molecule dynamic DNA junctions.
To develop switches responsive to various inputs with enhanced stability.
To enable sensitive detection and affinity measurements without amplification.

Main Methods:

Engineering single-molecule dynamic DNA junctions.
Utilizing input binding to enhance junction stability.
Employing transient fluorescent probe binding for output signals.
Analyzing kinetics-based outputs for signal discrimination.

Main Results:

Developed 'zero-leakage' molecular switches with high sensitivity.
Achieved distinguishable kinetics-based outputs, eliminating leakage signals at the single-molecule level.
Demonstrated output sensitivity to input binding affinity, functioning as an affinity meter.

Conclusions:

Engineered DNA dynamic junctions provide a robust platform for 'zero-leakage' molecular switches.
Kinetics-based outputs enable sensitive and reliable detection without amplification.
The developed switches have broad applications in DNA circuits, responsive materials, and biomolecule interaction studies.