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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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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...
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Mechanisms of Membrane Domain Formation00:59

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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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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Types of Membrane Protrusions01:28

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The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
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Multi-pass Transmembrane Proteins and β-barrels01:09

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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
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Updated: Jun 30, 2025

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro
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Protein-membrane interactions: sensing and generating curvature.

David H Johnson1, Orianna H Kou2, Nicoletta Bouzos1

  • 1Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089, USA.

Trends in Biochemical Sciences
|March 20, 2024
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Summary

Cellular membranes use proteins to stabilize their curved shapes, which are vital for cell functions like neurotransmission and endocytosis. This review covers new research on protein-membrane interactions and their roles in cellular processes.

Keywords:
BAR domainsclathrinintrinsically disordered proteinsmembrane bendingmembrane curvature sensingα-synuclein

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Biological membranes form curved structures essential for cellular functions.
  • These nanometer-scale curvatures are inherently unstable.
  • Proteins are key to sensing and stabilizing membrane curvature.

Purpose of the Study:

  • To review recent advances in understanding protein-membrane interactions at curved surfaces.
  • To highlight new methods for studying membrane curvature sensing and generation.
  • To examine cellular processes reliant on membrane curvature.

Main Methods:

  • Literature review of recent research.
  • Analysis of protein-lipid interactions.
  • Case studies of cellular processes.

Main Results:

  • Proteins play a crucial role in stabilizing and shaping biological membranes.
  • Novel techniques have improved the study of curvature dynamics.
  • Membrane curvature is critical for processes like neurotransmission and endocytosis.

Conclusions:

  • Understanding protein-membrane curvature interactions is advancing rapidly.
  • These interactions are fundamental to cellular organization and function.
  • Further research will continue to elucidate the role of membrane curvature in health and disease.