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Aptamer-mediated universal enzyme assay based on target-triggered DNA polymerase activity
Ki Soo Park1, Chang Yeol Lee2, Kyoung Suk Kang2
1Department of Chemical and Biomolecular Engineering (BK 21+ program), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-338, Republic of Korea; Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
We developed a universal enzyme assay using DNA polymerase activity triggered by target enzymes. This method enables sensitive detection of enzyme activity by destabilizing a probe, allowing for broad applications in enzyme determination.
Area of Science:
- Biochemistry
- Molecular Biology
- Assay Development
Background:
- Enzyme activity detection is crucial in diagnostics and research.
- Existing enzyme assays can lack universality or sensitivity.
- A novel approach is needed for broad and sensitive enzyme activity monitoring.
Purpose of the Study:
- To develop an innovative, universal fluorescence turn-on enzyme assay.
- To utilize target enzyme-triggered DNA polymerase activity for detection.
- To achieve sensitive and selective enzyme activity determination.
Main Methods:
- A two-step strategy involving target recognition and signal transduction.
- Target enzyme destabilizes a detection probe, releasing inhibited DNA polymerase.
- Primer extension and TaqMan probe hybridization monitor polymerase activity.
Main Results:
- Successfully detected activities of exonuclease I and uracil DNA glycosylase.
- Demonstrated high sensitivity and selectivity in enzyme detection.
- Validated the universal applicability of the assay design.
Conclusions:
- The developed assay is a universal platform for enzyme activity detection.
- The modular design allows for adaptation to various target enzymes.
- This method offers a sensitive and selective tool for biochemical analysis.
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