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General strategy for biosensor design and construction employing multifunctional surface-tethered components.
Igor L Medintz1, George P Anderson, Michael E Lassman
1Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, USA. lmedintz@cbmse.nrl.navy.mil
Analytical Chemistry
|October 1, 2004
Summary
This study introduces a novel method for creating self-assembling biosensors that are fully reversible and reagentless. These biosensors utilize specific protein-analyte interactions to generate detectable signals, offering a versatile platform for various applications.
Area of Science:
- Biotechnology
- Biosensor Technology
- Surface Chemistry
Background:
- Biosensors rely on bioreceptor-target analyte binding for signal generation, enabling continuous monitoring or reversible baseline readings.
- Existing biosensors often require reagents and complex assembly processes.
- Developing reagentless, self-assembling biosensors is crucial for simplified and efficient analyte detection.
Purpose of the Study:
- To present a novel approach for producing fully reversible, reagentless, self-assembling biosensors on surfaces.
- To demonstrate the feasibility of this approach using a prototype biosensor for maltose detection.
- To explore methods for controlling biosensor sensitivity and dynamic range.
Main Methods:
- Utilized a surface-immobilized E. coli maltose binding protein (MBP) as the bioreceptor, labeled with a quencher dye.
- Constructed a modular tether arm with a DNA oligonucleotide, FRET donor dye, and beta-cyclodextrin (beta-CD) analyte analogue.
- Employed DNA-directed immobilization for self-assembly of sensor components on a NeutrAvidin-coated surface.
Main Results:
- Achieved self-assembly of a functional biosensor with baseline Fluorescence Resonance Energy Transfer (FRET) quenching due to beta-CD and MBP interaction.
- Demonstrated concentration-dependent FRET changes upon addition of maltose, which displaces the beta-CD-dye from MBP.
- Showcased sensor regeneration by washing away the analyte, returning the system to baseline quenching levels.
Conclusions:
- The developed approach enables the creation of fully reversible, reagentless, self-assembling biosensors.
- The system's sensitivity and dynamic range can be tuned by modifying the bioreceptor or DNA tether.
- This versatile strategy holds potential for assembling a wide array of surface-based biosensors.