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Structural analysis of lipoprotein E particles.

Lumelle A Schneeweis1, Vishwanath Koppaka, Sissel Lund-Katz

  • 1University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Biochemistry
|September 15, 2005
PubMed
Summary
This summary is machine-generated.

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The structure of lipoprotein E particles is similar across all three apolipoprotein E isoforms, suggesting disease risks stem from molecular interactions, not gross structural differences. This research clarifies apolipoprotein E

Area of Science:

  • Biochemistry
  • Structural Biology
  • Lipid Metabolism

Background:

  • Apolipoprotein E (apoE) regulates cholesterol homeostasis and has three common isoforms.
  • Isoform differences are linked to cardiovascular and neurodegenerative disease risks.
  • The structure of apoE-containing lipoprotein particles and isoform-specific structural impacts remain unknown.

Purpose of the Study:

  • To investigate the structure of synthetic lipoprotein particles formed with different apolipoprotein E isoforms.
  • To determine if structural differences in these particles explain the varying disease risks associated with apoE isoforms.
  • To elucidate the nature of apolipoprotein E-lipid interactions within lipoprotein E particles.

Main Methods:

  • Preparation of synthetic lipoprotein particles using full-length apoE isoforms and truncated domains.

Related Experiment Videos

  • Analysis using calorimetry, electron microscopy, circular dichroism, and internal reflection infrared spectroscopy.

    • Main Results:

    • Particles formed with the three full-length apoE isoforms were discoidal and structurally indistinguishable.
    • Apolipoprotein E helices are oriented parallel to the particle surface, but lipid acyl chain order is low.
    • Data suggest two types of apoE-lipid interactions: one at the lipid bilayer edge and another disturbing acyl chain order.

    Conclusions:

    • Gross structural differences in lipoprotein E particles do not explain the differential disease risks of apoE isoforms.
    • The identified apoE-lipid interactions explain particle formation with varying protein/lipid ratios and the structure of particles made with truncated apoE domains.