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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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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 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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Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
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Mechanisms of Membrane-bending01:15

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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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Cellular Membranes and Drug Transport01:24

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Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

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Pharmacological tools to modulate ordered membrane domains and order-dependent protein function.

Katherine M Stefanski1,2, Hui Huang3,4, Dustin D Luu5

  • 1Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA. katherine.stefanski@vanderbilt.edu.

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Summary

Researchers screened 24,000 molecules and identified three novel compounds that modulate lipid raft formation and stability. These pharmacological tools offer new ways to study cell signaling and membrane properties.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Pharmacology

Background:

  • Ordered membrane nanodomains, or lipid rafts, are crucial for cellular functions.
  • Existing pharmacological tools to manipulate lipid rafts are limited.

Purpose of the Study:

  • To screen for small molecules that modulate the raft affinity of proteins.
  • To identify novel chemical tools for manipulating lipid raft formation and stability.

Main Methods:

  • Screened 24,000 small molecules using giant plasma membrane vesicles (GPMVs) and model raft proteins (PMP22, MAL).
  • Assessed compound impact on protein raft affinity, raft stability, and membrane properties.
  • Tested compounds in live cells to evaluate their effect on cell signaling.

Main Results:

  • Identified three distinct chemical compounds (VU0607402, VU0519975, primaquine diphosphate) that manipulate lipid rafts.
  • Two compounds (VU0607402, VU0519975) destabilize ordered membrane domains.
  • One compound (primaquine diphosphate) stabilizes ordered domains and increases PMP22 partitioning.
  • Compounds modulate raft formation independently of protein content by altering lipid-lipid interactions and membrane fluidity.
  • Raft-destabilizing compound VU0607402 modulated TRPM8 channel function in live cells.

Conclusions:

  • Developed novel pharmacological tools for probing lipid raft properties and function.
  • These compounds enable investigation of lipid raft roles in biophysical experiments and live-cell signaling.
  • Demonstrated the utility of VU0607402 in dissecting the role of membrane order and fluidity in cell signaling.