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Single Quantum Dot-Based Nanosensor for Sensitive Detection of O-GlcNAc Transferase Activity
Juan Hu1, Yueying Li1, Ying Li2
1College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University , Jinan 250014, China.
A novel nanosensor detects human O-GlcNAc transferase (OGT) activity using quantum dots. This sensitive, enzyme-free assay aids in diagnosing diseases like cancer and diabetes.
Area of Science:
- Biochemistry
- Nanotechnology
- Molecular Biology
Background:
- Protein glycosylation is vital for biological recognition.
- Dysregulated OGT activity is linked to cancer, diabetes, and neurodegenerative diseases.
Purpose of the Study:
- To develop a sensitive quantum dot (QD)-based nanosensor for OGT assay.
- To enable enzyme kinetic analysis, cellular OGT activity detection, and inhibitor screening.
Main Methods:
- Designed a Cy5/biotin-modified peptide substrate for OGT.
- Utilized a protease site for cleavage and glycosylation-dependent protection.
- Employed QD-peptide-Cy5 nanostructures and FRET for signal detection.
Main Results:
- Achieved a high sensitivity with a limit of detection of 3.47 × 10-13 M.
- Developed a simple, enzyme-free, and non-radioactive assay.
- Demonstrated applicability for enzyme kinetics, cellular activity, and inhibitor screening.
Conclusions:
- The QD-based nanosensor offers a sensitive and versatile platform for OGT detection.
- This method has significant potential for drug discovery and clinical diagnosis.
