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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Membrane Fluidity01:26

Membrane Fluidity

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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...
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Membrane Fluidity01:23

Membrane Fluidity

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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.
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Membrane Domains01:18

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.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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Related Experiment Video

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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Membrane pore formation at protein-lipid interfaces.

Robert J C Gilbert1, Mauro Dalla Serra2, Christopher J Froelich3

  • 1Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK.

Trends in Biochemical Sciences
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Pore-forming proteins (PFPs) can create toroidal pores by fusing lipid bilayer leaflets. This mechanism, distinct from channel formation, involves diverse proteins and peptides, offering new research avenues.

Keywords:
Bcl-2/colicin family proteinsMACPF/CDC family proteinsactinoporinspore-forming peptides and proteinsprotein–membrane interactionstoroidal pore formation

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Last Updated: Apr 20, 2026

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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Biophysics

Background:

  • Pore-forming proteins (PFPs) are crucial for membrane integrity.
  • PFPs typically form hydrophilic channels via oligomerized subunits.
  • Emerging evidence points to an alternative pore formation mechanism involving lipid bilayer fusion.

Purpose of the Study:

  • To review and discuss toroidal pore formation by various peptides and PFPs.
  • To highlight the structural and functional diversity of toroidal pores.
  • To suggest future research directions for investigating toroidal pores.

Main Methods:

  • Literature review and synthesis of existing research.
  • Comparative analysis of different PFP families and peptides.
  • Discussion of potential experimental approaches for toroidal pore characterization.

Main Results:

  • Toroidal pores are formed by the fusion of inner and outer lipid bilayer leaflets.
  • Examples include melittin, protegrin, Aβ1-41, Bax, actinoporins, and MACPF/CDC proteins.
  • This mechanism represents a distinct mode of membrane disruption.

Conclusions:

  • Toroidal pore formation is a conserved mechanism across diverse biological systems.
  • Understanding toroidal pores is essential for comprehending membrane disruption.
  • Further investigation into toroidal pore structure and function is warranted.