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Detection of structure-switching in G-quadruplexes using end-stacking ability.

Young Jun Seo¹, Il Joon Lee, Byeang Hyean Kim

¹Department of Chemistry, BK School of Molecular Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.

Bioorganic & Medicinal Chemistry Letters

|July 1, 2008

Summary

Oligodeoxynucleotides (ODNs) with aromatic fluorophores can detect G-quadruplex structural changes. Pi-stacking interactions of the fluorophore moiety on the G-quadruplex surface enable differentiation between mixed parallel/antiparallel and antiparallel structures.

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Area of Science:

Biochemistry
Molecular Biology
Chemical Biology

Background:

G-quadruplexes are non-canonical DNA secondary structures implicated in various biological processes.
Oligodeoxynucleotides (ODNs) are key components in G-quadruplex research.
Structural dynamics of G-quadruplexes are crucial for their function and regulation.

Purpose of the Study:

To develop a method for distinguishing between different G-quadruplex structural forms.
To investigate the use of aromatic fluorophores for G-quadruplex structure sensing.
To analyze the structural transitions of G-quadruplex-forming ODNs.

Main Methods:

Synthesis of G-quadruplex-forming ODNs with dangling aromatic fluorophore moieties (A(PY)).
Utilizing fluorescence spectroscopy to monitor structural changes.

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Analyzing pi-stacking interactions between the fluorophore and the G-quadruplex surface.

Comparing fluorescence signals for mixed parallel/antiparallel and antiparallel G-quadruplex structures.

Main Results:

Aromatic fluorophore moieties at the dangling ends of ODNs engage in pi-stacking interactions with the G-quadruplex surface.
Distinct fluorescence changes were observed, correlating with specific G-quadruplex structures.
The method successfully differentiated between mixed parallel/antiparallel and antiparallel G-quadruplex conformations.

Conclusions:

Fluorescence changes arising from A(PY) moiety pi-stacking provide a sensitive readout for G-quadruplex structural dynamics.
This approach offers a valuable tool for discriminating between distinct G-quadruplex architectures.
The findings contribute to understanding G-quadruplex structure-function relationships and developing novel molecular probes.