Cyclophospholipids Increase Protocellular Stability to Metal Ions.
Ö Duhan Toparlak1, Megha Karki2, Veronica Egas Ortuno2
1Department CIBIO, University of Trento, via Sommarive 9, 38123, Povo, Italy.
New research shows cyclophospholipids form stable protocells under diverse early Earth conditions. These robust vesicles offer a more plausible origin for life than fatty acids, supporting the emergence of Darwinian evolution.
Area of Science:
- Origin of life studies
- Biochemistry
- Astrobiology
Background:
- Model protocells are crucial for understanding early life.
- Fatty acid-based protocells are limited by instability in varying pH and metal ion concentrations.
- Metal ions are essential for biological catalysis and polymer function in extant life.
Purpose of the Study:
- To investigate prebiotically plausible cyclophospholipids as an alternative to fatty acids for stable protocell formation.
- To assess the stability of cyclophospholipid vesicles across a range of environmental conditions.
Main Methods:
- Synthesis and characterization of monoacyl cyclophospholipids.
- Vesicle formation and stability assays under varying pH and metal ion (Mg2+, Ca2+, Na+) concentrations.
Main Results:
- Monoacyl cyclophospholipids form robust vesicles.
- These vesicles exhibit stability across a broad pH range.
- Vesicles remain stable at high concentrations of Mg2+, Ca2+, and Na+.
- Na+ enhances the stability of vesicles in the presence of Mg2+ and Ca2+.
Conclusions:
- Cyclophospholipids offer a more stable and versatile alternative for early protocell models compared to fatty acids.
- These findings suggest cyclophospholipids could have played a key role in the origin of life and the emergence of Darwinian evolution.
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