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Fluorescence polarization biosensor based on an aptamer enzymatic cleavage protection strategy
Anthony Kidd1, Valérie Guieu, Sandrine Perrier
1Département de Pharmacochimie Moléculaire UMR 5063 CNRS, ICMG FR 2607, Université de Grenoble, Grenoble, France.
Analytical and Bioanalytical Chemistry
|October 7, 2011
Summary
This study introduces a new fluorescence polarization (FP) aptasensing method. It uses target-induced protection of DNA aptamers from enzymatic cleavage for sensitive detection.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Molecular Biology
Background:
- Fluorescence polarization (FP) is a sensitive technique for biomolecular analysis.
- Aptasensors offer specific molecular recognition capabilities.
- Enzymatic cleavage can be modulated by target binding, offering detection strategies.
Purpose of the Study:
- To develop a novel fluorescence polarization (FP) aptasensing platform.
- To utilize target-induced aptamer enzymatic cleavage protection for detection.
- To demonstrate the general applicability of the developed aptasensing approach.
Main Methods:
- A dye-labeled DNA aptamer was designed to be susceptible to enzymatic cleavage.
- Phosphodiesterase I mediated cleavage and subsequent FP analysis were employed.
- Target binding was shown to protect the aptamer from cleavage, altering the FP signal.
Main Results:
- A model system using tyrosinamide/antityrosinamide DNA aptamer demonstrated proof-of-concept.
- Target binding led to increased FP signal due to reduced enzymatic degradation.
- The method was successfully applied to detect ochratoxin A and adenosine.
Conclusions:
- The developed aptasensing platform offers a simple and broadly applicable method for molecular detection.
- Target-induced protection against enzymatic cleavage is an effective strategy for FP-based aptasensing.
- This approach enhances the sensitivity and specificity of aptamer-based detection systems.
