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Related Experiment Videos

Structure-guided protein engineering modulates helix bundle exchangeable apolipoprotein properties.

Robert S Kiss1, Paul M M Weers, Vasanthy Narayanaswami

  • 1Department of Biochemistry and Protein Engineering Network of Centers of Excellence, University of Alberta, Edmonton, Alberta T6G 2S2, Canada.

The Journal of Biological Chemistry
|April 10, 2003
PubMed
Summary
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Engineered a hybrid apolipoprotein by swapping a key receptor binding region from human apolipoprotein E into Manduca sexta apolipophorin III. This chimera retained structural integrity and gained enhanced lipid binding and low-density lipoprotein receptor interaction capabilities.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Lipid Metabolism

Background:

  • Apolipoprotein E (apoE) is crucial for lipid metabolism, mediating lipoprotein uptake via LDL receptor interactions.
  • The apoE receptor binding region (residues 134-150) is essential for this function.
  • Understanding the structural and functional requirements of this region is key to engineering new apolipoproteins.

Purpose of the Study:

  • To investigate the structural and functional requirements of the apoE receptor binding region.
  • To engineer a novel apolipoprotein chimera by swapping this region into a different apolipoprotein.
  • To assess the structural integrity and biological activity of the engineered chimera.

Main Methods:

  • Engineered a hybrid apolipoprotein by substituting apoE residues 131-151 with apoLp-III residues 146-166.

Related Experiment Videos

  • Expressed and purified the recombinant hybrid apolipoprotein in E. coli.
  • Characterized the chimera using heparin-Sepharose binding, circular dichroism spectroscopy, urea denaturation, and lipid vesicle solubilization assays.
  • Assessed LDL receptor binding activity using competition assays with 125I-LDL.

    • Main Results:

    • The hybrid apolipoprotein bound to heparin-Sepharose, unlike apoLp-III.
    • Circular dichroism and urea denaturation indicated preserved alpha-helical structure and stability similar to wild-type apoLp-III.
    • The chimera exhibited enhanced dimyristoylphosphatidylcholine (DMPC) vesicle solubilization activity.
    • Hybrid apolipoprotein-DMPC complexes competed with 125I-LDL for binding to LDL receptors on human fibroblasts.

    Conclusions:

    • A hybrid apolipoprotein containing the apoE receptor recognition element maintains structural integrity.
    • Helix swapping can confer new biological activities, such as enhanced lipid binding and receptor interaction.
    • This approach demonstrates potential for engineering apolipoproteins with desirable properties for lipid metabolism applications.