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Double stranded DNA discrimination by di-pyrene modified gamma-cyclodextrin.

Akane Takeda1, Kazuhiko Akimoto, Yoshihiko Kondo

  • 1Department of Material-Process and Applied Chemistry for Environments, Graduate School of Engineering and Resource Science, Akita University, Akita 010-8502, Japan.

Bioorganic & Medicinal Chemistry Letters
|May 11, 2010
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A new fluorescent molecule, di-pyrene modified gamma-cyclodextrin, can distinguish between single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA). This molecule shows high selectivity for dsDNA, indicated by a significant fluorescent signal change.

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Area of Science:

  • Supramolecular Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Cyclodextrins are versatile hosts with applications in molecular recognition.
  • Fluorescent probes are crucial for sensitive detection of biomolecules.
  • Distinguishing between single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) is important for various biological and diagnostic applications.

Purpose of the Study:

  • To synthesize a novel neutral fluorescent probe based on di-pyrene modified gamma-cyclodextrin.
  • To evaluate the probe's ability to selectively discriminate between ssDNA and dsDNA.
  • To investigate the binding interactions between the probe and different DNA forms using fluorescence.

Main Methods:

  • Synthesis of neutral fluorescent active di-pyrene modified gamma-cyclodextrin.
  • Fluorescence spectroscopy was employed to monitor binding events.
  • Titration experiments were performed by adding ssDNA and dsDNA to the probe solution.

Main Results:

  • The synthesized di-pyrene modified gamma-cyclodextrin exhibited selective binding towards dsDNA.
  • Binding with dsDNA resulted in a significant increase in fluorescence intensity.
  • No significant change in fluorescence intensity was observed upon addition of ssDNA, indicating high selectivity.

Conclusions:

  • The developed fluorescent probe demonstrates high selectivity for dsDNA over ssDNA.
  • This probe can serve as a sensitive tool for differentiating between dsDNA and ssDNA.
  • The fluorescence response mechanism provides a basis for developing new DNA sensing platforms.