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Engineering conformational destabilization into mouse apolipoprotein E. A model for a unique property of human
Danny M Hatters1, Clare A Peters-Libeu, Karl H Weisgraber
1Gladstone Institute of Neurological Disease, San Francisco, California 94158, USA.
The Journal of Biological Chemistry
|May 14, 2005
Summary
Apolipoprotein E4 (apoE4) is linked to Alzheimer's and heart disease. Researchers destabilized mouse apoE, finding it remodeled phospholipids faster, supporting the idea that apoE4's instability impacts lipid binding.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Apolipoprotein E4 (apoE4) is a significant risk factor for Alzheimer's disease and cardiovascular conditions.
- ApoE4 exhibits reduced stability and a higher tendency for partial folding compared to other isoforms (apoE2, apoE3).
Purpose of the Study:
- To investigate the in vivo significance of conformational stability differences in apolipoprotein E.
- To engineer a destabilized variant of mouse apoE's amino-terminal domain, mimicking apoE4's properties.
Main Methods:
- Determined the crystal structure of wild-type mouse apoE.
- Introduced specific mutations (G83T and N113G) into mouse apoE to destabilize its conformation.
- Assessed the phospholipid remodeling activity of the engineered mouse apoE variants.
Main Results:
- The crystal structure revealed wild-type mouse apoE forms a four-helix bundle, similar to apoE4.
- Mutations G83T and N113G successfully destabilized the mouse apoE conformation.
- The destabilized mutant mouse apoE demonstrated accelerated phospholipid remodeling compared to the wild-type.
Conclusions:
- A destabilized protein conformation enhances apolipoprotein E's lipid binding capabilities.
- These findings support the hypothesis that apoE4's inherent instability contributes to its associated disease risks.