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Eunkyung Ji¹, Danlu Wu, Kirk S Schanze

¹Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 24, 2010

Summary

This study developed a novel sensor using a conjugated polyelectrolyte and biotin-tetramethylrhodamine (biotin-TMR) for detecting avidin. The sensor achieves a low detection limit of 100 pM by monitoring fluorescence resonance energy transfer (FRET) changes.

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Area of Science:

Polymer Science
Bioconjugation Chemistry
Fluorescence Spectroscopy

Background:

Conjugated polyelectrolytes offer unique optical properties for sensing applications.
Biotin-tetramethylrhodamine (biotin-TMR) serves as a quencher-ligand for specific biomolecular interactions.
Fluorescence resonance energy transfer (FRET) is a powerful tool for studying molecular interactions.

Purpose of the Study:

To investigate the interaction between a phenylene-ethynylene based helical conjugated polyelectrolyte (poly-1) and biotin-TMR.
To develop a FRET-based sensor for avidin detection using the poly-1/biotin-TMR complex.
To elucidate the mechanism of avidin binding to the polymer-ligand complex.

Main Methods:

Synthesis and characterization of a phenylene-ethynylene based helical conjugated polyelectrolyte (poly-1).

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Complex formation studies between poly-1 and biotin-TMR, monitoring via FRET.

Investigation of FRET signal changes upon addition of avidin to the pre-formed complex.

Titration studies to determine the sensor's detection limit for avidin.

Main Results:

Biotin-TMR intercalates into the helical structure of poly-1, leading to efficient FRET.
Avidin addition to the poly-1/biotin-TMR complex forms cross-links without disrupting FRET.
Pre-mixing avidin with biotin-TMR prior to polymer addition disrupts FRET, enabling sensitive avidin detection.
A detection limit of 100 pM for avidin was achieved with this sensor configuration.

Conclusions:

The developed FRET-based system demonstrates high sensitivity and a low detection limit for avidin.
The interaction mechanism involves specific binding and cross-linking mediated by avidin.
This approach offers a promising platform for developing sensitive biosensors for protein detection.