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Single-Molecule Imaging of Nuclear Transport
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Protein Spherical Nucleic Acids for Live-Cell Chemical Analysis
Journal of the American Chemical Society
|July 25, 2020
Summary
Researchers developed protein spherical nucleic acids (ProSNAs) for live cell chemical analysis. This novel biosensor platform enables sensitive and specific detection of intracellular pH and glucose.
Area of Science:
- Biotechnology
- Chemical Biology
- Molecular Sensing
Background:
- Conventional biosensors face limitations like false positives.
- Need for advanced tools for live-cell chemical analysis.
Purpose of the Study:
- Develop a novel biosensor platform for live-cell chemical analysis.
- Demonstrate ProSNAs for pH and glucose detection in living cells.
Main Methods:
- Utilized protein spherical nucleic acids (ProSNAs) with nucleic acid shells and functional protein cores.
- Employed i-motif for pH sensing with a quencher-free readout.
- Incorporated glucose oxidase for amplified glucose detection.
Main Results:
- Developed a quencher-free, false-positive-resistant pH sensor.
- Achieved >100-fold fluorescence turn-on for glucose sensing.
- Demonstrated selective glucose detection (>5 μM) in the presence of analogs.
Conclusions:
- ProSNAs offer a versatile platform for intracellular analyte detection.
- The developed system enables sensitive and specific monitoring of cellular metabolites.
- This technology advances live-cell chemical analysis and biological studies.
