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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.
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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.
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Membrane shape remodeling by protein crowding.

Susanne Liese1, Andreas Carlson1

  • 1Department of Mathematics, Mechanics Division, University of Oslo, Oslo, Norway.

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This summary is machine-generated.

Protein crowding on membranes induces spontaneous curvature, altering cell shape. This minimal model explains diverse membrane morphologies like vesicles and tubes by balancing curvature and tension.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Soft Matter Physics

Background:

  • Steric repulsion between membrane proteins is a fundamental driver of biological membrane shape changes.
  • Understanding these shape dynamics is crucial for cellular processes like vesicle formation and membrane trafficking.

Purpose of the Study:

  • To develop a minimal theoretical model explaining how protein crowding influences membrane morphology.
  • To elucidate the relationship between protein crowding, spontaneous curvature, and membrane tension in determining membrane shapes.

Main Methods:

  • Development of a minimal biophysical model incorporating asymmetric protein crowding.
  • Analysis of the interplay between induced spontaneous curvature and membrane tension.
  • Theoretical prediction of energy-minimizing membrane shapes.

Main Results:

  • Protein crowding induces spontaneous curvature in biological membranes.
  • The balance between induced curvature and membrane tension dictates membrane shapes, including flat, spherical, tubular, and pearling structures.
  • Model accurately predicts a range of experimentally observed membrane morphologies.

Conclusions:

  • Asymmetric protein crowding is a key mechanism for generating diverse membrane shapes.
  • The model provides a quantitative framework for predicting and controlling membrane shape changes by tuning protein characteristics and crowding domain size.