Selective Preconcentration and Mass Spectrometry Profiling of Charged Extracellular Modified Ribonucleosides by...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• Extracellular modified ribonucleosides are crucial signaling molecules.
• Their low abundance in biofluids hinders functional studies.
• Existing sample preparation methods lack efficiency for extraction and purification.

Purpose of the Study:

• To develop an efficient method for extracting and preconcentrating extracellular modified nucleosides.
• To enable sensitive detection and profiling of these molecules in biological samples.
• To advance the understanding of ribonucleoside signaling pathways.

Main Methods:

• Development of a borate complexation, temperature-assisted ionic liquid microextraction (BTAIL-ME) technique.
• Optimization of ionic liquid solvents and extraction parameters (temperature, time, concentration).
• Mass spectrometry-compatible recovery of nucleosides for LC-MS analysis.

Main Results:

• The optimized BTAIL-ME method achieved preconcentration factors of ~27-fold for N7-methylguanosine (m7G) and ~30-fold for N1-methyladenosine (m1A).
• Demonstrated successful application to primary cultures of Aplysia californica neural tissues.
• Enabled LC-MS detection of three methylated, positively charged ribonucleosides.

Conclusions:

• BTAIL-ME offers a robust approach for profiling extracellular modified ribonucleosides.
• This method overcomes limitations of low abundance and facilitates LC-MS detection.
• Paves the way for deeper investigation into the biological roles of modified ribonucleosides.