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Related Concept Videos

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...
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.Fatty acids tails of phospholipids can be either saturated or...
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...
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...
Asymmetric Lipid Bilayer01:35

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%...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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: Jul 13, 2026

Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro
08:53

Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

Published on: January 11, 2017

How proteins move lipids and lipids move proteins.

H Sprong1, P van der Sluijs, G van Meer

  • 1Department of Cell Biology and Histology, Academic Medical Center, University of Amsterdam, PO Box 22700, 1100 DE Amsterdam.

Nature Reviews. Molecular Cell Biology
|July 4, 2001
PubMed
Summary

Cell membranes control their physical properties through precise lipid composition. This lipid distribution, directed by proteins, influences membrane shape and protein interactions.

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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

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Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
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Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy

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Last Updated: Jul 13, 2026

Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro
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Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

Published on: January 11, 2017

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
08:39

Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy

Published on: December 12, 2025

Area of Science:

  • Cellular biology
  • Biochemistry
  • Biophysics

Background:

  • Cell membranes are dynamic structures composed of lipids and proteins.
  • Lipid composition dictates membrane physical properties, influencing cellular functions.
  • Protein-lipid interactions are crucial for membrane organization and signaling.

Purpose of the Study:

  • To elucidate the mechanisms by which proteins regulate lipid distribution in cell membranes.
  • To investigate how lipid distribution, in turn, affects protein localization and function.
  • To understand the interplay between proteins and lipids in controlling membrane characteristics.

Main Methods:

  • Analysis of lipidomics data to identify specific lipid distributions.
  • Biophysical techniques to measure membrane physical properties.
  • Cellular imaging and protein localization studies.

Main Results:

  • Demonstrated protein-mediated control over specific lipid arrangements within membranes.
  • Observed that altered lipid distributions directly impact membrane deformation and protein recruitment.
  • Identified key proteins involved in directing lipid composition and function.

Conclusions:

  • Protein-lipid interactions are a fundamental mechanism for regulating membrane organization and function.
  • The precise control of lipid composition by proteins allows for dynamic membrane remodeling.
  • Understanding these interactions is key to comprehending cellular processes like vesicle trafficking and signal transduction.