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Optical sensing by transforming chromophoric silver clusters in DNA nanoreactors
Jeffrey T Petty1, Sandra P Story, Selina Juarez
1Department of Chemistry, Furman University, Greenville, South Carolina 29163, USA. jeff.petty@furman.edu
Analytical Chemistry
|November 22, 2011
Summary
This study introduces a novel DNA oligonucleotide sensor that uses silver clusters for detecting target DNA. The sensor changes spectral properties, enabling near-infrared detection in biological settings.
Area of Science:
- Biochemistry
- Nanotechnology
- Molecular Biology
Background:
- Few-atom silver clusters exhibit unique spectral properties dependent on DNA template sequences.
- Oligonucleotide sensors typically rely on specific DNA-target interactions for detection.
Purpose of the Study:
- To develop a bifunctional DNA oligonucleotide sensor for detecting target DNA strands.
- To utilize chromophoric silver clusters for spectral readout of DNA hybridization events.
Main Methods:
- Designing a bifunctional DNA oligonucleotide with a silver cluster template and a target recognition site.
- Investigating spectral changes (absorption and emission) upon target binding.
- Synthesizing silver clusters using DNA templates with varying lengths and compositions.
Main Results:
- The sensor selectively binds ~7 silver atoms, showing absorption at 400 nm in the absence of the target.
- Upon target binding, the sensor transitions to bind ~11 silver atoms, exhibiting near-infrared absorption at 720 nm and strong emission.
- Structural changes in the DNA sensor direct the conversion between distinct silver cluster states.
Conclusions:
- Bifunctional DNA-silver cluster sensors offer a versatile platform for oligonucleotide detection.
- The developed sensor enables near-infrared-based detection in complex biological environments.
- This approach provides a general strategy for creating responsive molecular sensors.
