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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Fluid Mosaic Model01:19

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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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What are Membranes?01:54

What are Membranes?

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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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What are Membranes?01:24

What are Membranes?

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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries...
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Related Experiment Video

Updated: Dec 18, 2025

In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth
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In Vesiculo Synthesis of Peptide Membrane Precursors for Autonomous Vesicle Growth

Published on: June 28, 2019

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Peptide-Oleate Complexes Create Novel Membrane-Bound Compartments.

Jesper S Hansen1,2, Tuan Hiep Tran1, Michele Cavalera1

  • 1Department of Microbiology, Immunology and Glycobiology, Institute of Laboratory Medicine, Lund University, Lund, Sweden.

Molecular Biology and Evolution
|June 11, 2020
PubMed
Summary
This summary is machine-generated.

Short peptides and oleic acid complexes can form new membrane-enclosed spaces from lipid vesicles. This suggests a molecular mechanism for the origin of cell division in early life.

Keywords:
cell divisiongiant unilamellar vesiclesoleic acidpeptidespeptide–oleate complexesphospholipidsprotocells

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Last Updated: Dec 18, 2025

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Area of Science:

  • Origin of life studies
  • Evolutionary biology
  • Biochemistry

Background:

  • The origin of cell division is a fundamental question in evolutionary theory.
  • Understanding the molecular mechanisms driving early cell replication is crucial for understanding life's beginnings.

Purpose of the Study:

  • To investigate potential molecular mechanisms for the origin of cell division.
  • To explore the role of simple molecular complexes in protocell formation and division.

Main Methods:

  • Observation of interactions between short alpha-helical peptides and oleic acid.
  • Analysis of the formation of membrane-enclosed spaces from lipid vesicles.

Main Results:

  • Complexes of alpha-helical peptides and oleic acid spontaneously created multiple membrane-enclosed spaces from single lipid vesicles.
  • These peptide-acid complexes demonstrated the ability to initiate and sustain vesicle division.

Conclusions:

  • The findings propose a novel molecular model for protocell division.
  • Simple molecular assemblies may hold the key to understanding the emergence of cellular replication.