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Colorimetric Detection of Bacteria Using Litmus Test

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Published on: September 17, 2016

Allosterically tunable, DNA-based switches triggered by heavy metals.

Alessandro Porchetta¹, Alexis Vallée-Bélisle, Kevin W Plaxco

¹Dipartimento di Scienze e Tecnologie Chimiche, University of Rome , Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy.

Journal of the American Chemical Society

|August 27, 2013

Summary

Researchers designed DNA molecular switches controlled by metal ions. These switches offer tunable responses, enhancing DNA-based nanomachines.

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Area of Science:

Biochemistry
Molecular Biology
Nanotechnology

Background:

Molecular switches are crucial for controlling biological processes and developing advanced nanomachines.
Existing molecular switches often lack precise control and tunable dynamic ranges.

Purpose of the Study:

To rationally design allosterically controllable, metal-ion-triggered molecular switches using DNA.
To engineer switches with tunable responses for improved functionality in DNA-based nanomachines.

Main Methods:

Designed DNA sequences adopting two low-energy conformations: one non-binding and one with mismatch sites for metal ion recognition.
Incorporated multiple metal binding sites to achieve homotropic allosteric (cooperative) responses.
Utilized single-stranded DNA sequences as heterotropic allosteric effectors to stabilize or destabilize the non-binding state.

Main Results:

Demonstrated the successful design of DNA sequences acting as metal-ion-triggered molecular switches.
Achieved specific recognition of mercury(II) or silver(I) ions through mismatch sites.
Showcased tunable dynamic range over several orders of magnitude using allosteric effectors.

Conclusions:

The rational design of allosterically controllable DNA molecular switches is feasible.
These metal-ion-triggered switches offer tunable responses, advancing DNA-based nanomachinery.
The developed approach provides a valuable tool for enhancing the functionality of DNA-based nanodevices.