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Mechanisms of Membrane-bending

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...

Multi-pass Transmembrane Proteins and β-barrels

Multi-pass Transmembrane Proteins and β-barrels

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 G-protein-linked receptors (GPCRs) and...

Introduction to Membrane Proteins

Introduction to Membrane Proteins

The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell types have...

Mechanisms of Membrane Domain Formation

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...

Single-pass Transmembrane Proteins

Single-pass Transmembrane Proteins

Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...

Membrane Proteins

Membrane Proteins

Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...

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Related Experiment Video

Updated: Jun 20, 2026

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

Published on: December 7, 2017

Membrane-bending proteins.

William A Prinz¹, Jenny E Hinshaw

¹Laboratory of Cell Biochemistry and Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA. wprinz@helix.nih.gov

Critical Reviews in Biochemistry and Molecular Biology

|September 29, 2009

Summary

This summary is machine-generated.

Cellular membrane shape is dynamically regulated by proteins. This review summarizes how proteins bend membranes through leaflet area changes, scaffolding, or lipid interactions.

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Last Updated: Jun 20, 2026

Pulling Membrane Nanotubes from Giant Unilamellar Vesicles

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Published on: December 7, 2017

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

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

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

Published on: November 30, 2022

Area of Science:

Biochemistry
Cell Biology

Background:

Cellular membranes exhibit dynamic shapes crucial for various cellular processes.
Membrane deformation is orchestrated by intricate protein-lipid interactions.
Several protein families are known to directly induce membrane bending.

Purpose of the Study:

To review the mechanisms by which different protein families bend cellular membranes.
To consolidate current understanding of protein-mediated membrane deformation.

Main Methods:

Literature review of studies on protein-lipid interactions and membrane dynamics.
Categorization of protein-mediated membrane bending mechanisms.
Analysis of protein domains, scaffolding, and lipid-interaction effects.

Main Results:

Proteins bend membranes via three primary mechanisms: inserting amphipathic domains, forming rigid scaffolds, or altering lipid clustering and ordering.
Insertion of amphipathic domains increases the area of one leaflet, inducing membrane curvature.
Scaffolding proteins stabilize or induce membrane deformations.
Lipid clustering or ordering modulation by proteins also contributes to membrane shape changes.

Conclusions:

Proteins play a critical role in shaping cellular membranes through diverse molecular mechanisms.
Understanding these mechanisms is key to deciphering cellular processes involving membrane dynamics.
Further research may uncover novel protein-mediated membrane deformation strategies.