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Updated: Oct 5, 2025
A11-positive β-amyloid Oligomer Preparation and Assessment Using Dot Blotting Analysis
Published on: May 22, 2018
Kinetic Modulation of Amyloid-β (1-42) Aggregation and Toxicity by Structure-Based Rational Design
Dongjoon Im1,2,3, Chae Eun Heo1, Myung Kook Son1,2,3
1Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Abstract:
Several point mutations can modulate protein structure and dynamics, leading to different natures. Especially in the case of amyloidogenic proteins closely related to neurodegenerative diseases, structural changes originating from point mutations can affect fibrillation kinetics. Herein, we rationally designed mutant candidates to inhibit the fibrillation process of amyloid-β with its point mutants through multistep in silico analyses. Our results showed that the designed mutants induced kinetic self-assembly suppression and reduced the toxicity of the aggregate. A multidisciplinary biophysical approach with small-angle X-ray scattering, ion mobility-mass spectrometry, mass spectrometry, and additional in silico experiments was performed to reveal the structural basis associated with the inhibition of fibril formation. The structure-based design of the mutants with suppressed self-assembly performed in this study could provide a different perspective for modulating amyloid aggregation based on the structural understanding of the intrinsically disordered proteins.
Insights
Researchers designed mutant proteins to inhibit amyloid-β fibrillation, reducing toxicity. This structure-based approach offers new strategies for modulating protein aggregation in neurodegenerative diseases.
Area of Science:
- Biochemistry
- Structural Biology
- Neuroscience
Background:
- Point mutations alter protein structure and dynamics, impacting amyloidogenic proteins linked to neurodegenerative diseases.
- Mutations in amyloid-beta (Aβ) can influence the kinetics of protein fibrillation, a key process in Alzheimer's disease.
Purpose of the Study:
- To rationally design mutant candidates that inhibit the fibrillation process of amyloid-beta.
- To investigate the structural basis for the inhibition of fibril formation.
Main Methods:
- Multistep in silico analyses for rational design of mutant candidates.
- Biophysical techniques including small-angle X-ray scattering (SAXS), ion mobility-mass spectrometry (IM-MS), and mass spectrometry (MS).
- In silico experiments to complement experimental findings.
Main Results:
- Designed mutants successfully suppressed amyloid-beta self-assembly kinetics.
- The developed mutants demonstrated reduced toxicity of the resulting aggregates.
- Experimental and computational data revealed the structural mechanisms underlying inhibited fibril formation.
Conclusions:
- Structure-based design of mutants can effectively inhibit amyloid aggregation.
- This approach provides a novel strategy for modulating amyloid formation in neurodegenerative conditions.
- Understanding intrinsically disordered proteins is key to developing new therapeutic interventions.
