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Related Concept Videos

Membrane Fluidity01:26

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 Fluidity01:23

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.
Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell types have...
The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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.
Fluid Mosaic Model01:19

Fluid Mosaic Model

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...
Introduction to Membrane Traffic01:44

Introduction to Membrane Traffic

The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...

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Related Experiment Video

Updated: May 10, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Introductory lecture: basic quantities in model biomembranes.

John F Nagle1

  • 1Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA. nagle@cmu.edu

Faraday Discussions
|June 29, 2013
PubMed
Summary
This summary is machine-generated.

This study reviews membrane biophysics, focusing on the bending modulus (K(C)) of lipid bilayers and atomic simulations. It highlights methods for measuring membrane flexibility and understanding lipid structures for biological insights.

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Area of Science:

  • Membrane biophysics
  • Supramolecular biophysics
  • Lipid bilayer systems

Background:

  • Explores material moduli governing supramolecular energies in biological membranes.
  • Critically reviews the bending modulus (K(C)) of lipid bilayers, essential for membrane flexibility.
  • Discusses discrepancies in K(C) values obtained from shape analysis versus micromechanical and X-ray methods.

Discussion:

  • Evaluates the application of atomic-level simulations for quantitative analysis of lipid bilayer structures.
  • Introduces diagnostics for assessing the accuracy of molecular simulations.
  • Examines lateral heterogeneity in biomembranes, particularly concerning lipid mixtures.

Key Insights:

  • Discrepancies in bending modulus measurements may stem from differing methodologies.
  • Atomic simulations offer detailed insights into lipid bilayer structure and dynamics.
  • Synergy between coarse-grained simulations, analytical theories, and experimental data enhances understanding of lipid behavior.

Outlook:

  • Future research directions include integrating biological molecules into lipid bilayers.
  • Investigating membrane shape transformations and non-bilayer structures is crucial.
  • Advancing simulation techniques and experimental validation will deepen our comprehension of membrane functions.