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Summary

A novel trifluoromethylated guanosine analog, CF3thG, exhibits red-shifted fluorescence and is compatible with cellular applications. This emissive guanosine analog can be incorporated into RNA and used for live cell imaging, showing controlled release in response to guanosine gradients.

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Molecular Biology

Background:

  • Development of novel nucleoside analogs for biological applications.
  • Need for emissive probes for live cell imaging and RNA labeling.

Purpose of the Study:

  • To synthesize and characterize a new trifluoromethylated guanosine analog (CF3thG).
  • To evaluate the photophysical properties of CF3thG in different environments.
  • To assess the compatibility of CF3thG with enzymatic transcription and cellular systems.
  • To demonstrate the utility of CF3thG for live cell imaging.

Main Methods:

  • Synthesis of CF3thG via trifluoromethylation.
  • Spectroscopic analysis (absorption and emission).
  • Photophysical studies in various solvents.
  • In vitro transcription assays with T7 RNA polymerase.
  • Cell viability assays (HEK293T cells).
  • Confocal microscopy for live cell imaging.

Main Results:

  • CF3thG shows red-shifted absorption and emission spectra compared to its precursor.
  • Photophysical properties are influenced by solvent polarity, indicating electronic effects of the trifluoromethyl group.
  • T7 RNA polymerase efficiently incorporates CF3thG into RNA transcripts, yielding highly emissive products.
  • CF3thG exhibits no cytotoxicity in HEK293T cells at tested concentrations.
  • Live cell imaging successfully visualized the free analog, demonstrating its brightness and red-shifted emission.
  • Cellular release of CF3thG was observed and modulated by guanosine concentration.

Conclusions:

  • CF3thG is a promising emissive guanosine analog with tunable photophysical properties.
  • The analog is well-tolerated by T7 RNA polymerase and HEK293T cells.
  • CF3thG serves as a valuable tool for creating fluorescent RNA and for live cell imaging applications.
  • The observed release dynamics suggest potential for developing responsive molecular probes.