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From lanosterol to cholesterol: structural evolution and differential effects on lipid bilayers.

Ling Miao1, Morten Nielsen, Jenifer Thewalt

  • 1MEMPHYS, Physics Department, University of Southern Denmark-Odense, DK-5230 Odense M, Denmark. miao@fysik.sdu.dk

Biophysical Journal
|February 28, 2002
PubMed
Summary

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Cholesterol and its precursor lanosterol impact cell membrane structure. Cholesterol more effectively stabilizes the liquid-ordered membrane phase and orders lipid acyl chains compared to lanosterol.

Area of Science:

  • Biochemistry
  • Biophysics
  • Membrane Biology

Background:

  • Cholesterol is a key component of mammalian cell plasma membranes.
  • Lanosterol is the biosynthetic precursor to cholesterol.
  • Konrad Bloch proposed lanosterol's role in cholesterol's molecular evolution.

Purpose of the Study:

  • To compare the effects of cholesterol and lanosterol on lipid-bilayer membrane properties.
  • To investigate how molecular evolution from lanosterol to cholesterol affects membrane structure and phase behavior.

Main Methods:

  • Deuterium NMR spectroscopy on multilamellar lipid-sterol systems.
  • Monte Carlo simulations of lipid-sterol interactions.
  • Analysis of molecular conformational order and phase equilibria.

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Main Results:

  • Cholesterol enhances and stabilizes the liquid-ordered membrane phase more than lanosterol.
  • Sterols, particularly cholesterol, induce collective order in lipid acyl-chain conformations.
  • The transition from lanosterol to cholesterol chemistry increases membrane ordering capabilities.

Conclusions:

  • The molecular evolution from lanosterol to cholesterol significantly impacts lipid-bilayer properties.
  • Cholesterol's structure confers a greater ability to stabilize ordered membrane phases.
  • Findings are relevant to understanding membrane domains and lipid rafts.