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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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Fluid Mosaic Model01:19

Fluid Mosaic Model

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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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The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Membrane Fluidity01:26

Membrane Fluidity

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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
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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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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Oct 3, 2025

Author Spotlight: Enhancing In Vitro Cell Culture Models with Recombinant Functionalized Spider Silk Membranes
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Author Spotlight: Enhancing In Vitro Cell Culture Models with Recombinant Functionalized Spider Silk Membranes

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Spontaneous Membranization in a Silk-Based Coacervate Protocell Model.

Zhuping Yin1, Liangfei Tian2, Avinash J Patil1

  • 1Centre for Protolife Research and Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.

Angewandte Chemie (International Ed. in English)
|February 17, 2022
PubMed
Summary

Researchers developed a dynamic protocell model using alginate/silk coacervates. These membrane-less droplets can reversibly form semipermeable vesicles, offering new insights into cytomimetic models.

Keywords:
CoacervatesProtocellsSilk

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Silk Film Culture System for in vitro Analysis and Biomaterial Design
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Silk Film Culture System for in vitro Analysis and Biomaterial Design

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Silk Film Culture System for in vitro Analysis and Biomaterial Design
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Silk Film Culture System for in vitro Analysis and Biomaterial Design

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Area of Science:

  • Biomimetic chemistry
  • Protocell research
  • Materials science

Background:

  • Coacervate micro-droplets are valuable protocell models but lack physical membranes, limiting their cytomimetic applications.
  • Existing stabilization methods often involve irreversible shell formation using external agents.
  • Endogenous, reversible membranization processes in protocells remain largely unexplored.

Purpose of the Study:

  • To develop a dynamic protocell model with reversible membranization capabilities.
  • To investigate endogenous mechanisms for creating semipermeable coacervate vesicles.
  • To explore pH-controlled structural reconfiguration and solute trafficking within protocells.

Main Methods:

  • Utilized alginate/silk coacervate micro-droplets as the base protocell construct.
  • Investigated spontaneous self-organization of amphiphilic silk polymers at droplet surfaces under specific charge conditions.
  • Employed an antagonistic enzyme system to program internal pH and control membranization reversibility.

Main Results:

  • Demonstrated reversible formation of semipermeable coacervate vesicles from membrane-less droplets without auxiliary agents.
  • Showcased endogenous control of membranization via pH programming using an enzyme system.
  • Coupled protocell structural reconfigurations with the trafficking of water-soluble solutes.

Conclusions:

  • A novel dynamic protocell model based on alginate/silk coacervates with endogenous, reversible membranization was successfully created.
  • This system allows for controlled structural changes and solute transport, mimicking cellular functions.
  • Opens new avenues for designing hybrid protocell models with adaptable structural properties.