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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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...
Lipids as Anchors01:32

Lipids as Anchors

In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Membrane Domains01:18

Membrane Domains

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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Related Experiment Video

Updated: May 17, 2026

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
10:34

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

Published on: April 23, 2017

Well-defined lipid interfaces for protein adsorption studies.

Cristina Satriano1, Sofia Svedhem, Bengt Kasemo

  • 1Department of Chemical Sciences, Catania University, viale Andrea Doria, 6, 95125 Catania, Italy. csatriano@unict.it

Physical Chemistry Chemical Physics : PCCP
|November 8, 2012
PubMed
Summary
This summary is machine-generated.

Electrostatic interactions are key for ferritin adsorption onto artificial lipid membranes. This study used advanced biophysical techniques to reveal how ferritin binds to supported lipid bilayers (SLBs).

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Published on: February 10, 2022

Area of Science:

  • Biophysics
  • Materials Science
  • Surface Chemistry

Background:

  • Understanding biomolecule-surface interactions is crucial for developing biosensors and drug delivery systems.
  • Artificial lipid membranes, such as supported lipid bilayers (SLBs), serve as model systems for cell membranes.
  • Ferritin, a protein involved in iron storage, presents a model biomolecule for studying adsorption phenomena.

Purpose of the Study:

  • To investigate the adsorption of ferritin onto supported lipid bilayers (SLBs) with varying compositions and charges.
  • To elucidate the role of electrostatic forces in the ferritin-SLB interaction.
  • To characterize the biomolecule-artificial lipid membrane interface using multiple biophysical techniques.

Main Methods:

  • Quartz Crystal Microbalance with Dissipation monitoring (QCM-D) to quantify adsorption.
  • Surface Plasmon Resonance (SPR) to measure binding kinetics and affinity.
  • Fluorescence Recovery After Photobleaching (FRAP) to assess membrane fluidity and ferritin mobility.

Main Results:

  • Ferritin adsorption onto SLBs is highly dependent on the lipid bilayer's charge.
  • Electrostatic interactions were identified as the primary driving force for ferritin binding to SLBs.
  • Specific lipid compositions significantly influenced the adsorption efficiency and stability of ferritin layers.

Conclusions:

  • The study highlights the critical role of electrostatics in controlling ferritin adsorption on artificial membranes.
  • These findings provide fundamental insights into biomolecule-membrane interactions, relevant for biomaterial design.
  • QCM-D, SPR, and FRAP are powerful complementary techniques for characterizing such interfaces.