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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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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.
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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
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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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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...
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Membrane stiffness is modified by integral membrane proteins.

Philip W Fowler1, Jean Hélie1, Anna Duncan1

  • 1Department of Biochemistry, University of Oxford, South Parks Rd, Oxford, OX1 3QU, UK. mark.sansom@bioch.ox.ac.uk.

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Summary

Integral membrane proteins significantly alter cell membrane stiffness, unlike peripheral proteins. Increased density of integral proteins, such as BtuB, reduces membrane bending rigidity, impacting biological functions.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Membrane Biophysics

Background:

  • Cell membrane flexibility is crucial for biological processes.
  • Peripheral proteins influencing membrane curvature are well-studied.
  • The impact of integral membrane proteins on membrane stiffness remains largely unknown.

Purpose of the Study:

  • To investigate the effect of integral membrane proteins on membrane bending rigidity.
  • To determine if integral membrane proteins alter membrane stiffness.
  • To compare the effects of integral and peripheral membrane proteins on membrane mechanics.

Main Methods:

  • Validation of the MARTINI forcefield for calculating bending rigidity.
  • Computer simulations of large lipid bilayer patches (approx. 50,000 lipids).
  • Analysis of membrane bending rigidity with varying lipid composition and protein content.

Main Results:

  • The MARTINI forcefield accurately reproduces experimental bending rigidity.
  • Altering lipid composition affects membrane bending rigidity.
  • Integral membrane proteins alter membrane stiffness, while peripheral proteins do not.
  • Higher densities of integral proteins, like BtuB, lead to greater reductions in stiffness.

Conclusions:

  • Integral membrane proteins play a significant role in modulating cell membrane stiffness.
  • Membrane stiffness can be tuned by the type and density of integral membrane proteins.
  • These findings have implications for understanding diverse cellular functions regulated by membrane mechanics.