Researchers at the Hebrew University of Jerusalem have linked fatty acids to hydroxy acids, resulting in membrane-like structures that assemble easily and survive longer in water. The findings suggest a possible mechanism for the transition from dormant chemistry to pre-living systems.
One of the central puzzles in the study origin of life It is how simple molecules, which existed on the ancient Earth, organized themselves into systems that were stable and orderly enough to allow the emergence of cells. New research by Dr. Moran Frankel-Pinter and her colleagues fromThe Hebrew University This suggests that the solution did not result from a single molecule, but rather from a collaboration between two types of materials.
Modern cells rely on two basic components: a membrane that separates the cell from its environment and large molecules that perform chemical actions and carry information. However, on the ancient Earth, the complex mechanisms that produce proteins, DNA and phospholipids did not yet exist. The researchers wanted to see if simpler versions of membranes andpolymers They could have developed together.
The team connected fatty acids, which are capable of organizing into membrane-like structures in water, to hydroxy acids, which can form short chains called oligomers. The reactions resulted in conjugated molecules in which the short chain is attached to a fat-like part.
The combination gave both components an advantage. The combined molecules organized into tiny structures at a concentration that was about an order of magnitude lower than the concentration required for fatty acids alone. Among other things, vesicles—bubble-like structures that can serve as primitive chemical compartments—were observed under the microscope.
At the same time, the attachment to the fatty acids protected the oligomers from hydrolysis, that is, decomposition following reaction with water. This is an important result because water is essential for life processes, but can also break down chemical bonds and prevent the accumulation of complex molecules.
Thus, a system of mutual benefit was created: the oligomers improved the ability of the fat-like molecules to assemble into organized structures, while the fatty component extended the life of the oligomers in water.
The researchers say this is not proof that this is how life actually originated. The experiment demonstrates a plausible chemical pathway in which two problems that are usually studied separately—forming membranes and forming polymers—could be solved together. Nor was the result limited to a specific pair of materials: a similar effect was seen with several combinations of fatty acids and hydroxy acids.
Beyond research The beginning of lifeThe mechanism may contribute to the development of biodegradable materials. The reactions are carried out without solvents, and the products are based on simple components that can biodegrade.
Questions and Answers
Did the researchers create a living cell?
No. They created membrane-like chemical structures, demonstrating how simple molecules could organize themselves and become more stable.
Why is the connection between molecules important?
The short polymers helped organize the membranes, while the fatty portion protected the polymers from degradation in water.
Are the conditions in the experiment the same as those on the ancient Earth?
The experiment used simple reactions that fit pre-biological scenarios, but there is no way to know whether the same process actually occurred.
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