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Related Concept Videos

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...
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%...
Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
Biosynthesis of Lipids01:29

Biosynthesis of Lipids

Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
Membrane Lipids01:32

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...

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Updated: Jun 1, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Lipid polymorphisms and membrane shape.

Vadim A Frolov1, Anna V Shnyrova, Joshua Zimmerberg

  • 1Unidad de Biofisica (Centro Mixto CSIC-UPV/EHU), Leioa 48940, Spain.

Cold Spring Harbor Perspectives in Biology
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

Lipids

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Area of Science:

  • Cell biology
  • Biophysics

Background:

  • Cellular membranes require morphological plasticity for essential life processes.
  • Membrane rearrangements are constrained by compartment integrity and organelle stability.
  • Lipids' polymorphic nature is key to membrane flexibility and shape control.

Purpose of the Study:

  • To explore the significance of lipid polymorphism in cellular membrane shaping.
  • To elucidate the role of lipid shapes in controlling cell membrane morphology.

Main Methods:

  • Review of lipid self-assembly principles.
  • Analysis of lipid polymorphism in biological membranes.
  • Discussion of morphological and topological membrane behaviors.

Main Results:

  • Lipids' ability to adopt various shapes (polymorphism) enables membrane flexibility.
  • Self-assembled lipid structures form adaptable yet stable membrane frameworks.
  • Lipid polymorphism is crucial for maintaining cellular compartment integrity.

Conclusions:

  • Lipid polymorphism is fundamental for cellular membrane dynamics and morphology.
  • Understanding lipid behavior is vital for comprehending organelle function and cellular division.