Concurrent Phosphite Oxidation and Adenosine Phosphorylation Under Prebiotic Evaporative Conditions

Area of Science:

• Astrobiology
• Prebiotic Chemistry
• Organic Chemistry

Background:

• Phosphorylation is crucial for life, but prebiotic routes remain unclear.
• Reduced phosphorus species like phosphite are potential prebiotic phosphorus sources.
• The role of phosphite in prebiotic phosphorylation needs further investigation.

Purpose of the Study:

• Investigate concurrent phosphite oxidation and adenosine phosphorylation/phosphonylation.
• Explore reactions under prebiotically plausible aqueous conditions.
• Determine the formation of organophosphorus compounds from simple precursors.

Main Methods:

• Aqueous reactions of phosphite, urea, hydrogen peroxide, and adenosine.
• Simulated warm evaporating pool (75-78°C) and wet-dry cycling conditions.
• Product characterization using ³¹P and ¹H NMR spectroscopy.

Main Results:

• Synthesis of adenosine phosphates, adenosine phosphites, and adenosine diphosphate (ADP).
• Up to 73% total adenosine-phosphorus products under evaporating pool conditions.
• Up to 60% products with a preference for adenosine phosphates under wet-dry cycling.

Conclusions:

• Phosphite oxidation and phosphorus incorporation into adenosine occur concurrently under prebiotic conditions.
• Urea facilitates dehydration and condensation reactions in these systems.
• Coupled oxidation, phosphorylation, and condensation transform simple materials into complex organophosphorus compounds relevant to nucleotide chemistry.