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Related Concept Videos

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.
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 anterior...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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 cytoskeletal...
Eukaryotic Compartmentalizations01:46

Eukaryotic Compartmentalizations

One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal cells...
Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
For example, lysosomes in the animal cells...
Plasma Membrane in Bacteria and Archaea01:27

Plasma Membrane in Bacteria and Archaea

The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
Prokaryotic Cells01:28

Prokaryotic Cells

Prokaryotes are small unicellular organisms that include the domains — Archaea and Bacteria. Bacteria include many common microorganisms, such as Salmonella and E. coli, while the Archaea include extremophiles that live in harsh environments, such as volcanic springs.
Like eukaryotic cells, all prokaryotic cells are surrounded by a plasma membrane, have genetic material in the form of single, circular DNA, a cytoplasm that fills the interior of the cell, and ribosomes that synthesize proteins.

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Related Experiment Video

Updated: Jun 10, 2026

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
08:58

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores

Published on: April 15, 2019

Functional microdomains in bacterial membranes.

Daniel López1, Roberto Kolter

  • 1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.

Genes & Development
|August 18, 2010
PubMed
Summary
This summary is machine-generated.

Bacterial membranes possess microdomains similar to eukaryotic lipid rafts, containing key signaling and transport proteins. Inhibiting these structures impacts biofilm formation and protein secretion, revealing a conserved membrane organization principle.

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

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Related Experiment Videos

Last Updated: Jun 10, 2026

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores
08:58

Visualization of Germinosomes and the Inner Membrane in Bacillus subtilis Spores

Published on: April 15, 2019

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers
08:10

In Vitro Reconstitution of Self-Organizing Protein Patterns on Supported Lipid Bilayers

Published on: July 28, 2018

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

Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Eukaryotic cells possess specialized membrane microdomains called lipid rafts, crucial for cellular signaling and transport.
  • These lipid rafts are characterized by specific protein and lipid compositions, influencing membrane dynamics and function.

Purpose of the Study:

  • To investigate the presence and function of similar membrane microdomains in bacterial cells.
  • To determine if bacterial microdomains harbor proteins homologous to eukaryotic lipid raft components.
  • To assess the physiological impact of inhibiting bacterial microdomain formation.

Main Methods:

  • Comparative analysis of bacterial membrane proteins against eukaryotic lipid raft markers, including Flotillin-1 homologs.
  • Utilizing zaragozic acid, a squalene synthase inhibitor, to disrupt microdomain formation in bacteria.
  • Assessing the effects of microdomain inhibition on bacterial biofilm formation, protein secretion, and cell viability.

Main Results:

  • Bacterial membranes from diverse species harbor microdomains containing Flotillin-1 homologs and other signaling/transport proteins.
  • Inhibition of microdomain formation using zaragozic acid significantly impaired bacterial biofilm formation.
  • Protein secretion in bacteria was also negatively affected by microdomain inhibition, while cell viability remained largely unaffected.

Conclusions:

  • Bacterial membranes contain functional microdomains analogous to eukaryotic lipid rafts.
  • These bacterial microdomains play essential roles in regulating biofilm formation and protein secretion.
  • The organization of physiological processes within membrane microdomains represents a conserved biological feature across different domains of life.