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Related Experiment Video

Updated: Sep 8, 2025

Author Spotlight: Characterizing DNA G-Quadruplex by Bis-3-Chloropiperidine Based Chemical Mapping
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Tetraphenylethene derivative that discriminates parallel G-quadruplexes.

Lei Liu1, Wei Zhang2, Ming-Qing Zhong1

  • 1State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, University Town Guian New District Guizhou 550025 P. R. China shenxiangchun@126.com xcd@gmc.edu.cn.

RSC Advances
|June 15, 2022
PubMed
Summary

A new fluorescent probe, TPE-B, selectively detects parallel G-quadruplex (G4) structures. This molecule offers a valuable tool for studying G4s, which are important nucleic acid structures in genomes.

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Area of Science:

  • Molecular Biology
  • Biophysical Chemistry
  • Chemical Biology

Background:

  • G-quadruplex (G4) structures are non-canonical nucleic acid formations found in genomes.
  • G4s play crucial roles in various biological processes, making them targets for study.
  • Developing selective fluorescent probes for G4s is essential but challenging.

Purpose of the Study:

  • To synthesize and characterize a novel tetraphenylethene derivative, TPE-B, as a fluorescent probe.
  • To evaluate TPE-B's selectivity and efficacy in detecting parallel G-quadruplex structures.

Main Methods:

  • Synthesis of the tetraphenylethene derivative TPE-B.
  • Fluorescence spectroscopy to assess G4 binding and response.
  • Circular dichroism (CD) spectroscopy and melting curve analysis for structural studies.
  • Electrospray ionization mass spectrometry (ESI-MS) for binding stoichiometry.
  • Gel staining assays for evaluating probe performance.

Main Results:

  • TPE-B exhibits a strong fluorescence response upon binding to G-quadruplex structures.
  • TPE-B demonstrates significantly higher fluorescence intensity for parallel G4s compared to anti-parallel ones.
  • CD spectra and melting curves confirm TPE-B selectively binds and stabilizes parallel G4s without altering topology.
  • ESI-MS indicates a 1:1 binding stoichiometry between TPE-B and parallel G4s.
  • Gel staining results validate TPE-B as a suitable probe for parallel G4s.

Conclusions:

  • TPE-B functions as a selective fluorescent light-up probe for parallel G-quadruplex structures.
  • The developed probe offers a promising tool for discriminating and studying parallel G4s in biological contexts.
  • TPE-B's ability to stabilize parallel G4s without topological changes enhances its utility in G4 research.