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Updated: May 10, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
05:37

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Fluorogenic substrate screening for G-quadruplex DNAzyme-based sensors.

Yang Cai1, Nan Li, De-Ming Kong

  • 1State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300071, PR China.

Biosensors & Bioelectronics
|June 25, 2013
PubMed
Summary
This summary is machine-generated.

Researchers screened fluorogenic substrates for G-quadruplex DNAzymes to enhance sensor sensitivity. Tyramine hydrochloride and 10-acetyl-3,7-dihydroxyphenoxazine were identified as optimal substrates for different G-quadruplex DNAzyme applications.

Keywords:
DNAzymeFluorogenic substrateG-quadruplexHeminScreening

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Molecular Biology

Background:

  • G-quadruplex DNAzymes offer high specificity but often require sensitive detection methods.
  • Fluorescence detection generally provides higher sensitivity than colorimetric methods for biosensors.
  • Developing optimal fluorogenic substrates is crucial for advancing G-quadruplex DNAzyme-based sensor performance.

Purpose of the Study:

  • To identify and evaluate suitable fluorogenic substrates for G-quadruplex DNAzyme applications.
  • To improve the sensitivity of G-quadruplex DNAzyme-based sensors through optimized substrate selection.
  • To compare the performance of different fluorogenic substrates in various sensing systems.

Main Methods:

  • Screening of seven candidate fluorogenic substrates for G-quadruplex DNAzyme compatibility.
  • Evaluation of signal-to-background ratios for different substrates in the presence and absence of G-quadruplexes.
  • Assessment of fluorescence signal changes in response to hydrogen peroxide (H2O2) with different substrates.
  • Application of selected substrates in a model G-quadruplex DNAzyme-based Cu(2+) sensor.

Main Results:

  • Tyramine hydrochloride demonstrated the highest signal-to-background ratio, making it suitable for sensors involving G-quadruplex formation or destruction.
  • 10-acetyl-3,7-dihydroxyphenoxazine showed the maximum fluorescence signal change with H2O2, ideal for H2O2 detection.
  • In a Cu(2+) sensing model, tyramine hydrochloride significantly lowered the detection limit from 4 nM to 0.7 nM compared to colorimetric methods.

Conclusions:

  • Tyramine hydrochloride and 10-acetyl-3,7-dihydroxyphenoxazine are effective fluorogenic substrates for specific G-quadruplex DNAzyme sensor applications.
  • The selection of an appropriate fluorogenic substrate is critical for maximizing sensitivity in G-quadruplex DNAzyme-based sensing platforms.
  • Fluorescence-based detection with optimized substrates offers a substantial improvement in sensitivity for G-quadruplex DNAzyme sensors.