ATP-Assisted Protocellular Membrane Formation with Ethanolamine-Based Amphiphiles

Area of Science:

• Origin of Life Studies
• Biochemistry
• Supramolecular Chemistry

Background:

• Prebiotic membranes are crucial for compartmentalizing life's components.
• Modern cell membranes utilize ethanolamine phospholipids, suggesting a link to early membrane formation.

Purpose of the Study:

• To investigate the prebiotic synthesis of ethanolamine-based amphiphiles.
• To explore their ability to form protocellular membranes under simulated early Earth conditions.
• To understand the role of templating molecules like ATP and ADP in vesicle formation.

Main Methods:

• Wet-dry cycles for amphiphile synthesis.
• Turbidimetry, NMR, DLS, fluorescence, and microscopy for characterization.
• Glucose encapsulation studies to assess membrane integrity.

Main Results:

• OLEA and OLMEA were synthesized under wet-dry cycles.
• OLEA-ATP and OLMEA-ATP (3:1 ratio) formed stable protocellular membranes, with ATP acting as a template.
• OLDMEA did not form membranes; ADP templated smaller OLEA vesicles, indicating phosphate backbone's role in curvature.

Conclusions:

• N-methylethanolamine-based amphiphiles can form prebiotic vesicles.
• The ethanolamine moiety's hydrogen bonding ability confers an evolutionary advantage for stable protocell formation in fluctuating environments.
• This work offers insights into the transition from prebiotic chemistry to early cellular life.