Nucleoside phosphorylation: a feasible step in the prebiotic pathway to RNA

Area of Science:

• Prebiotic chemistry
• Origin of life studies
• Nucleotide synthesis

Background:

• Early Earth conditions and prebiotic chemistry are crucial for understanding life's origins.
• Nucleotides are fundamental building blocks of nucleic acids, essential for all known life.
• Previous studies, like Lohrmann and Orgel (1971), explored prebiotic nucleoside phosphorylation using inorganic phosphate and urea.

Purpose of the Study:

• To investigate and optimize prebiotic phosphorylation of nucleosides under plausible early Earth conditions.
• To achieve preferential formation of 5-nucleotide monophosphates (5-NMPs).
• To develop methods for purifying and recycling desired nucleotide products.

Main Methods:

• Utilizing a modified Lohrmann and Orgel system with heated dry films and urea.
• Employing selective binding to hydroxylapatite for purification of 5-NMPs.
• Investigating hydrolytic conditions for selective phosphate removal.

Main Results:

• A modified system achieved preferential phosphorylation at the 5-OH group over the 3(2)-OH group (2-fold preference).
• Formation of undesired derivatives was minimized.
• Hydrolysis showed a 3:1 preference for removing phosphates from the 3-OH group over the 5-OH group.
• Hydroxylapatite effectively removed bis-phosphorylated compounds.

Conclusions:

• The modified system offers a more efficient route to prebiotic 5-NMPs.
• Selective purification and hydrolysis strategies enhance product yield and purity.
• A proposed recycling procedure further improves the efficiency of 5-NMP production from byproducts.