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Related Concept Videos

What are Lipids?01:31

What are Lipids?

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Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial to all living organisms.  The three biologically important classes of lipids are triglycerides, phospholipids, and steroids.
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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Related Experiment Video

Updated: Jul 9, 2025

Preparation, Purification, and Use of Fatty Acid-containing Liposomes
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Cyclophospholipids Enable a Protocellular Life Cycle.

Ö Duhan Toparlak1, Lorenzo Sebastianelli2, Veronica Egas Ortuno3

  • 1Department of Cellular, Computational and Integrative Biology, University of Trento, Via Sommarive 9, 38123 Povo, Trentino, Italy.

ACS Nano
|December 1, 2023
PubMed
Summary

New protocells made from cyclophospholipids and fatty acids can grow and divide, retaining genetic material. This breakthrough addresses a key challenge in origin of life research, enabling Darwinian evolution under prebiotic conditions.

Keywords:
Darwinian evolutionartificial cellscyclophospholipidsprebiotic chemistryprotocells

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Area of Science:

  • Origin of Life Research
  • Prebiotic Chemistry
  • Biochemistry

Background:

  • Current model protocells using fatty acid vesicles fail at necessary magnesium concentrations for nucleic acid function.
  • Existing methods to improve vesicle stability, like prebiotic chelates, hinder protocell growth and division.
  • A plausible pathway for self-replicating protocell emergence remains elusive due to these limitations.

Purpose of the Study:

  • To develop a prebiotically plausible protocell model capable of growth and division in the presence of essential magnesium ions.
  • To demonstrate the retention of encapsulated nucleic acids during protocell replication.
  • To show compatibility with key chemical processes required for early genome replication.

Main Methods:

  • Constructing protocells from mixtures of cyclophospholipids and fatty acids.
  • Testing protocell stability and function in the presence of Mg2+-citrate.
  • Assessing nucleic acid retention, nucleotide uptake, and compatibility with nonenzymatic RNA extension.

Main Results:

  • Protocells composed of cyclophospholipid and fatty acid mixtures successfully grew and divided in Mg2+-citrate.
  • Encapsulated nucleic acids were retained throughout the growth and division cycle.
  • Protocells demonstrated the ability to acquire surrounding nucleotides and supported nonenzymatic RNA oligonucleotide extension.

Conclusions:

  • Lipid mixtures of cyclophospholipids and fatty acids form robust protocells active under prebiotic conditions.
  • These protocells overcome critical limitations of previous models, supporting nucleic acid function and replication.
  • The findings present a viable pathway for the emergence of Darwinian evolution from nonliving matter.