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Asymmetric Lipid Bilayer

Asymmetric Lipid Bilayer

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%...

Membrane Fluidity

Membrane Fluidity

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
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...

Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...

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.
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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.
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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 with the analogy of...

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Related Experiment Video

Updated: Jun 26, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Bilayer lipid membranes from falling droplets.

Michele Zagnoni¹, Mairi E Sandison, Phedra Marius

¹School of Electronics and Computer Science, University of Southampton, Highfield, So17 1BJ, Southampton, UK. M.Zagnoni@elec.gla.ac.uk

Analytical and Bioanalytical Chemistry

|January 20, 2009

Summary

Researchers developed a microfluidic system for rapid suspended lipid bilayer formation. This method simplifies creating bilayer lipid membranes (BLMs) with membrane proteins for electrophysiology measurements.

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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Last Updated: Jun 26, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

Published on: July 10, 2016

Area of Science:

Biophysics
Microfluidics
Membrane Science

Background:

Bilayer lipid membranes (BLMs) are crucial for studying membrane protein function.
Traditional methods for BLM formation can be complex and time-consuming.
Microfluidic platforms offer potential for miniaturized and automated biological assays.

Purpose of the Study:

To develop a rapid and simple method for forming suspended lipid bilayers.
To integrate BLM formation with microfluidic systems for advanced applications.
To enable straightforward electrophysiology measurements of membrane proteins.

Main Methods:

Utilized a polymeric microfluidic device with a conical cavity.
Formed lipid monolayers at a liquid-liquid interface.
Injected aqueous droplets containing membrane proteins or proteoliposomes onto an electrode above an aperture.

Main Results:

Achieved spontaneous formation of suspended lipid bilayers solely based on device geometry.
Demonstrated the ability to inject droplets containing membrane proteins for functional studies.
Enabled straightforward electrophysiology measurements and buffer exchange.

Conclusions:

The described microfluidic system provides a facile and rapid approach to BLM formation.
This method is suitable for integration into lab-on-a-chip devices.
The system facilitates electrophysiological characterization of membrane proteins in a controlled environment.