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Engineering a Red Fluorescent Protein Chromophore for Visualization of RNA G-Quadruplexes.

Chang He1, Jiasheng Peng1, Zheng Li1

  • 1School of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.

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|June 28, 2023
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Researchers developed DEBIT, a novel red fluorescent probe, for visualizing RNA G-quadruplexes (G4s) in living cells. This advancement offers a new tool for studying G4 structures in biological imaging and therapeutics.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Synthetic red fluorescent protein (RFP) chromophores are crucial for biological imaging.
  • Visualizing endogenous RNA G-quadruplexes (G4s) in living cells remains challenging.
  • Existing G4 probes have limitations in cellular applications.

Purpose of the Study:

  • To develop a novel red fluorescent probe for selective RNA G-quadruplex detection in living cells.
  • To create a tool for real-time monitoring of RNA G4 dynamics.
  • To expand the utility of synthetic RFP chromophores in biological research.

Main Methods:

  • Modification of synthetic red fluorescent protein (RFP) chromophores.
  • Integration of Thioflavin T (ThT) G4 recognition moiety.
  • Synthesis and characterization of the novel fluorescent probe DEBIT.
  • Testing DEBIT's selectivity, binding affinity, and photostability for G4 structures.

Main Results:

  • DEBIT, a novel red fluorescent probe, was successfully synthesized.
  • DEBIT exhibits selective recognition of RNA G-quadruplex structures.
  • The probe demonstrates strong binding affinity and high selectivity for G4s.
  • DEBIT possesses excellent photostability, enabling real-time monitoring.
  • Successful visualization of endogenous RNA G4s in living cells was achieved.

Conclusions:

  • DEBIT is a powerful new fluorescent probe for visualizing RNA G-quadruplexes in living cells.
  • This work expands the application scope of synthetic RFP chromophores.
  • DEBIT represents a significant addition to the available toolkit for G4 research.