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FRET Microscopy for Real-time Monitoring of Signaling Events in Live Cells Using Unimolecular Biosensors
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A FRET-based biosensor for NO detection.

Maria Strianese1, Franco De Martino, Vincenzo Pavone

  • 1Dipartimento di Chimica, Università di Salerno, via Ponte Don Melillo, Fisciano (Sa), I84084 Italy.

Journal of Inorganic Biochemistry
|March 23, 2010
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel method for detecting nitric oxide (NO) using fluorescently labeled cytochrome c peroxidase (CcP). This sensitive biosensor offers a fast and quantitative approach for NO monitoring.

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Analytical Chemistry

Background:

  • Nitric oxide (NO) is a crucial signaling molecule in biological systems.
  • Accurate and sensitive detection of NO is essential for research and diagnostics.
  • Existing NO detection methods may have limitations in sensitivity or speed.

Purpose of the Study:

  • To develop a sensitive biosensor for nitric oxide (NO) detection.
  • To utilize fluorescently labeled cytochrome c peroxidase (CcP) and Förster Resonance Energy Transfer (FRET).
  • To explore the immobilization of CcP for a solid-state NO sensing device.

Main Methods:

  • Employing fluorescently labeled CcP from baker's yeast.
  • Utilizing the Förster Resonance Energy Transfer (FRET) mechanism for NO detection.
  • Determining binding affinity (K(d)), dissociation rate (k(off)), and association rate (k(on)) constants for NO-CcP interaction.
  • Immobilizing labeled CcP into a polymeric matrix.

Main Results:

  • Achieved sub-micromolar level detection of NO.
  • Determined the binding affinity constant (K(d)) for NO to CcP as 10±1.5 µM.
  • Quantified NO dissociation (k(off) = 0.22±0.08 min⁻¹) and association (k(on) = 0.024±0.002 µM⁻¹ min⁻¹) rate constants.
  • Demonstrated proof-of-principle for a solid-state NO sensing device.

Conclusions:

  • Fluorescently labeled CcP is a viable tool for sensitive NO monitoring.
  • The developed FRET-based system provides a fast, simple, and quantitative NO sensing solution.
  • Immobilization of CcP in a polymeric matrix enables practical application in solid-state devices.