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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...
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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%...
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...
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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...
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Membrane Domains

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Related Experiment Video

Updated: Jul 4, 2026

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

Lipases at interfaces: unique interfacial properties as globular proteins.

P Reis1, R Miller, J Krägel

  • 1Nestlé Research Center, CH-1000 Lausanne 26, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 3, 2008
PubMed
Summary

Lipase exhibits unique interfacial properties compared to beta-lactoglobulin, maintaining activity even after forming a skin-like film. Understanding these properties can help regulate lipase activity and lipolysis.

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Last Updated: Jul 4, 2026

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

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Published on: March 5, 2017

Lipid-Protein Membrane Structure-Function Characterization using Droplet Interface Bilayers
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Published on: June 12, 2026

Defining Substrate Specificities for Lipase and Phospholipase Candidates
08:59

Defining Substrate Specificities for Lipase and Phospholipase Candidates

Published on: November 23, 2016

Area of Science:

  • Biochemistry
  • Surface Chemistry
  • Protein Science

Background:

  • Proteins at interfaces are crucial in food, pharmaceutical, and industrial applications.
  • Understanding protein adsorption behavior is key to controlling interfacial properties and biological activity.

Purpose of the Study:

  • To investigate the adsorption behavior and interfacial properties of lipase from Rhizomucor miehei and beta-lactoglobulin.
  • To compare the interfacial behavior of lipase with a reference protein, beta-lactoglobulin.
  • To explore the impact of interfacial behavior on lipase activity and lipolysis.

Main Methods:

  • Pendant drop technique to study protein adsorption at oil/water and air/water interfaces.
  • Analysis of adsorption kinetics and isotherms.
  • Compression of protein films to observe structural changes.

Main Results:

  • Mathematical models accurately described the adsorption behavior of both proteins.
  • Lipase displayed unique interfacial properties distinct from beta-lactoglobulin.
  • Both proteins formed a folded drop with a 'skin-like' film after aging and compression, indicative of unfolding and cross-linking.
  • Lipase activity remained unaffected despite these interfacial changes.

Conclusions:

  • Lipase exhibits unique interfacial activation properties, maintaining enzymatic activity even after significant structural changes at the interface.
  • The study provides insights into the mechanisms regulating lipolysis by understanding lipase's physical properties.
  • Findings suggest novel strategies for controlling lipase activity based on its interfacial behavior.