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Related Concept Videos

Membrane Lipids01:32

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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The ER synthesizes lipids for building cell membranes and performing cellular functions such as energy storage and signaling. The lipid synthesis machinery embedded in the ER membrane primarily collects all reactants from the cytosol. Following synthesis, the secretory pathway and the ER contact sites distribute these lipids to other cellular organelles. Additionally, the energy-rich triacylglycerides are transported from the ER via lipid droplets.
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Lipid Vesicle-mediated Affinity Chromatography using Magnetic Activated Cell Sorting LIMACS: a Novel Method to Analyze Protein-lipid Interaction
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Cholesterol interactions with ceramide and sphingomyelin.

Aritz B García-Arribas1, Alicia Alonso1, Felix M Goñi1

  • 1Biofisika Institute (CSIC, UPV/EHU), and Departamento de Bioquímica, Universidad del País Vasco, 48080 Bilbao, Spain.

Chemistry and Physics of Lipids
|May 2, 2016
PubMed
Summary

Sphingolipids like sphingomyelin (SM) interact with cholesterol (Chol) and ceramide (Cer) in cell membranes. These interactions form complex networks and influence membrane structure, particularly in lipid rafts.

Keywords:
Atomic force microscopyCeramideCholesterolConfocal fluorescence microscopyDifferential scanning calorimetryHydrogen bondingSphingolipidsSphingomyelin

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Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Lipidomics

Background:

  • Sphingolipids possess chemical groups enabling complex hydrogen-bonding networks with other bilayer lipids.
  • Interactions between sphingomyelin (SM) and cholesterol (Chol) are central to the lipid raft hypothesis.
  • SM-Ceramide (Cer) complexes are implicated in cellular stress responses.

Purpose of the Study:

  • To explore the intricate phase behavior and interactions within ternary mixtures of SM, cholesterol, and ceramide.
  • To investigate the competitive binding of cholesterol and ceramide to sphingomyelin.
  • To synthesize emerging data on direct cholesterol-ceramide interactions.

Main Methods:

  • Analysis of hydrogen-bonding capabilities of sphingolipid polar heads.
  • Examination of sphingomyelin-cholesterol interactions within lipid bilayers.
  • Investigation of sphingomyelin-ceramide complex formation under stress conditions.
  • Study of ternary mixtures (SM, Chol, Cer) to understand phase dynamics.
  • Review of recent findings on direct cholesterol-ceramide interactions.

Main Results:

  • Sphingolipids establish extensive hydrogen-bond networks within lipid bilayers.
  • Specific SM-Chol interactions are key to lipid raft formation.
  • SM-Ceramide complexes form in response to cellular stress.
  • Ternary mixtures of SM, Chol, and Cer exhibit complex phase behavior with mutual displacement.
  • Direct interactions between cholesterol and ceramide are increasingly recognized.

Conclusions:

  • The interactions between sphingomyelin, cholesterol, and ceramide are complex and dynamic.
  • These lipid interactions play a crucial role in membrane organization and function.
  • Understanding these ternary lipid systems provides insights into membrane biophysics and cellular processes.