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Related Concept Videos

Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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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.
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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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Islet Amyloid Polypeptide Membrane Interactions: Effects of Membrane Composition.

Xiaoxue Zhang1, Johnna R St Clair2, Erwin London1,2

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Anionic lipids and altered membrane composition promote islet amyloid polypeptide (IAPP) amyloid formation and membrane damage, contributing to type 2 diabetes. Cholesterol mitigates these effects, suggesting therapeutic potential.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Diabetes Research

Background:

  • Islet amyloid polypeptide (IAPP) aggregation is implicated in β-cell dysfunction and type 2 diabetes.
  • The β-cell membrane's role in IAPP-induced toxicity is an area of active investigation.

Purpose of the Study:

  • To investigate how lipid composition, salt, and buffer conditions influence IAPP amyloid formation.
  • To determine the impact of these factors on IAPP's ability to induce model membrane leakage.

Main Methods:

  • Studied IAPP amyloid formation kinetics and membrane permeabilization using model lipid vesicles.
  • Varied lipid composition (anionic, zwitterionic, cholesterol), salt concentration (NaCl), and buffer conditions.

Main Results:

  • Anionic lipids significantly enhance IAPP amyloid formation and membrane permeabilization.
  • Cholesterol reduces IAPP amyloid formation rate and membrane leakage, except when high levels of anionic lipids are present.
  • NaCl's effect on IAPP amyloid formation is concentration-dependent and varies between membrane-bound and solution states.

Conclusions:

  • Membrane lipid composition, particularly anionic lipids and cholesterol, critically modulates IAPP amyloidogenesis and membrane toxicity.
  • Altered membrane properties, potentially due to loss of phosphatidylserine asymmetry, may drive IAPP-related β-cell damage in vivo.
  • Findings suggest potential therapeutic strategies targeting membrane interactions to prevent IAPP-induced toxicity.