Hidden Aggregation Hot-Spots on Human Apolipoprotein E: A Structural Study

Area of Science:

• Biochemistry
• Neuroscience
• Molecular Biology

Background:

• Human apolipoprotein E (apoE) transports cholesterol but can form amyloid deposits in diseases.
• The apoE4 isoform is a significant risk factor for late-onset Alzheimer's disease.
• Lipid-free apoE co-localizes with amyloid-beta (Aβ) in Alzheimer's plaques.

Purpose of the Study:

• To elucidate the mechanism of apoE misfolding and aggregation.
• To investigate the interaction between apoE and Aβ in the context of Alzheimer's disease.
• To identify potential targets for anti-aggregation drug development.

Main Methods:

• In vitro biophysical analysis of short apoE peptide analogues.
• Computational investigation of apoE dynamics and apoE-Aβ complex formation.
• Prediction of amyloidogenic determinants using the AMYLPRED tool.

Main Results:

• Short apoE peptide analogues were identified as triggers for apoE aggregation.
• In vitro and computational results confirmed apoE's propensity to form amyloid fibrils.
• Computational analysis revealed apoE's amyloidogenic regions as binding sites for oligomeric Aβ.

Conclusions:

• ApoE self-assembly into amyloid fibrils is driven by specific peptide sequences.
• ApoE-Aβ interactions at amyloidogenic regions are crucial in Alzheimer's pathogenesis.
• Targeting these apoE regions presents a promising strategy for Alzheimer's anti-aggregation therapies.