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Related Concept Videos

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...
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...
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...
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...
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%...

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Related Experiment Video

Updated: Jun 13, 2026

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
06:32

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions

Published on: July 28, 2022

Macromolecules that prefer their membranes curvy.

Kerwyn Casey Huang1, Kumaran S Ramamurthi

  • 1Department of Bioengineering, Stanford University, Stanford, CA 94305, USA. kchuang@stanford.edu

Molecular Microbiology
|May 7, 2010
PubMed
Summary

Bacterial cell organization relies on proteins and lipids using membrane curvature for localization. This review explores curvature-sensing mechanisms and their biophysical limits in bacteria.

Area of Science:

  • Bacterial cytology
  • Cell biology
  • Biophysics

Background:

  • Bacterial cell organization is a complex process.
  • Early macromolecular sorting establishes cellular non-uniformity.
  • Specific localization events are guided by chemical landmarks.

Purpose of the Study:

  • To review mechanisms of macromolecular localization in bacterial cells.
  • To examine the role of membrane curvature in protein and lipid sorting.
  • To discuss the physical limitations and modeling of curvature-sensing molecules.

Main Methods:

  • Literature review of bacterial cytology studies.
  • Analysis of lipid and protein localization data.
  • Discussion of biophysical modeling approaches.

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Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
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Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

Published on: December 7, 2017

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro
08:27

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

Published on: November 30, 2022

Related Experiment Videos

Last Updated: Jun 13, 2026

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
06:32

Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions

Published on: July 28, 2022

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
06:26

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

Published on: December 7, 2017

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro
08:27

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

Published on: November 30, 2022

Main Results:

  • Lipids and proteins utilize membrane curvature for targeted localization within bacterial cells.
  • Curvature-mediated localization is a key mechanism for establishing cellular organization.
  • Physical limits and properties of curvature-sensing macromolecules are being elucidated.

Conclusions:

  • Membrane curvature is a critical factor in bacterial cell organization.
  • Understanding curvature-sensing mechanisms provides insights into bacterial cytology.
  • Further research and modeling are essential to fully grasp these biophysical processes.