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Interference with Amyloid-β Nucleation by Transient Ligand Interaction.
Tao Zhang1,2, Jennifer Loschwitz3,4, Birgit Strodel5,6
1Institute of Complex Systems, Structural Biochemistry (ICS-6), Forschungszentrum Jülich, 52425 Jülich, Germany. tao.zhang@uni-duesseldorf.de.
Molecules (Basel, Switzerland)
|June 15, 2019
Summary
All-D-peptide D3 binds to amyloid-beta (Aβ) monomers, slowing Alzheimer's-associated Aβ42 fibrillation. This study reveals how D3 modulates Aβ nucleation, offering insights into intrinsically disordered protein interactions.
Area of Science:
- Biochemistry
- Neuroscience
- Drug Discovery
Background:
- Alzheimer's disease is linked to amyloid-beta (Aβ) peptide aggregation.
- Intrinsically disordered proteins like Aβ present challenges for studying ligand interactions.
- All-D-peptides offer high specificity and metabolic stability for drug development.
Purpose of the Study:
- To characterize the interaction between the all-D-peptide D3 and Aβ42 monomers.
- To investigate how D3 binding affects Aβ42 aggregation and fibrillation.
- To elucidate the molecular mechanism of D3's influence on Aβ assemblies.
Main Methods:
- Characterization of D3-Aβ42 monomer interactions.
- Stoichiometry analysis of D3-Aβ42 complexes.
- Assessment of D3's effect on Aβ42 β-sheet formation and fibrillation kinetics.
Main Results:
- D3 binds Aβ42 monomers with submicromolar affinity.
- D3 and Aβ42 form complexes with varying stoichiometries (e.g., 1:1).
- Substoichiometric D3 concentrations significantly inhibit Aβ42 fibrillation by modulating nucleation.
Conclusions:
- D3 is a potent inhibitor of Aβ42 aggregation.
- D3's mechanism involves interference with the Aβ42 nucleation phase.
- This work advances understanding of intrinsically disordered protein interactions and potential therapeutic strategies for Alzheimer's disease.
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