Selective RNA binding and imaging with imidazopyrazine-based fluorescent molecule

Area of Science:

• Chemical synthesis and characterization of novel heterocyclic compounds.
• Biophysical chemistry and molecular interactions.
• Cellular imaging and bioanalytical applications.

Background:

• Development of fluorescent probes for nucleic acid detection is crucial for understanding biological processes.
• Existing probes often lack specificity or exhibit suboptimal photophysical properties.
• Imidazopyrazine scaffolds offer potential for designing novel fluorescent molecules.

Purpose of the Study:

• To synthesize and characterize novel imidazopyrazine-based fluorescent molecules (5a and 5b).
• To investigate the binding interactions of these molecules with RNA and DNA.
• To evaluate the potential of these molecules for cellular RNA imaging and sensing.

Main Methods:

• Organic synthesis and spectroscopic characterization (UV-Vis, fluorescence).
• Nucleic acid binding assays (spectroscopy, agarose gel electrophoresis).
• Cellular imaging studies using MCF-7 cells.

Main Results:

• Molecules 5a and 5b were successfully synthesized and characterized.
• Molecule 5b demonstrated superior photophysical properties, including stable fluorescence and high quantum yield.
• Molecule 5b exhibited strong and selective binding to RNA, indicated by fluorescence quenching and spectral changes.
• Agarose gel electrophoresis confirmed RNA binding.
• Cellular imaging revealed that 5b penetrates MCF-7 cells, selectively stains RNA, and maintains fluorescence for extended periods.

Conclusions:

• Novel imidazopyrazine-based fluorescent molecules were developed.
• Molecule 5b is a promising candidate for RNA-specific bioimaging and sensing.
• These findings contribute to the advancement of tools for studying RNA dynamics in living cells.