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A duplex DNA-gold nanoparticle probe composed as a colorimetric biosensor for sequence-specific DNA-binding proteins
Junho Ahn1, Yeonweon Choi1, Ae-Ree Lee1
1Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 660-701, Korea. jonghwa@gnu.ac.kr.
The Analyst
|February 24, 2016
Summary
Researchers developed a colorimetric assay using DNA-gold nanoparticle (AuNP) aggregates to detect SQUAMOSA Promoter-binding-Like protein 12 (SPL-12). This method offers a rapid and sensitive way to identify SPL-12 through a distinct color change.
Area of Science:
- Nanotechnology
- Biochemistry
- Molecular Biology
Background:
- Gold nanoparticles (AuNPs) are widely used in biosensing due to their unique optical properties.
- DNA-AuNP assemblies offer a versatile platform for molecular recognition.
- Detecting specific DNA-binding proteins is crucial for diagnostics and research.
Purpose of the Study:
- To develop a novel colorimetric method for the direct detection of SQUAMOSA Promoter-binding-Like protein 12 (SPL-12).
- To utilize duplex DNA-AuNP aggregates for sequence-specific protein recognition.
- To establish a rapid and sensitive assay based on observable color changes.
Main Methods:
- Preparation of duplex DNA-AuNP aggregates by attaching thiol-modified DNA strands to AuNPs.
- Incubation of duplex DNA-AuNP aggregates with the target protein, SPL-12.
- Monitoring changes in aggregate size and absorption spectra (color change) upon protein binding.
- Conducting control experiments with Bovine Serum Albumin (BSA).
Main Results:
- Duplex DNA-AuNP aggregates recognized SPL-12, leading to a color change from red to blue (absorption shift from 529 nm to 570 nm).
- The aggregation size increased from 160 nm to approximately 247 nm upon SPL-12 addition.
- Detection was rapid, especially at higher temperatures.
- No spectral changes were observed when using BSA, indicating specificity for SPL-12.
Conclusions:
- Duplex DNA-AuNP aggregates can be effectively used for the sequence-specific detection of SPL-12.
- The observed colorimetric response provides a simple visual readout for protein presence.
- This method demonstrates potential for sensitive and rapid protein detection applications.
