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Updated: Jan 26, 2026
10:43
siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells
Published on: May 24, 2014
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Ubiquitin binds the amyloid β peptide and interferes with its clearance pathways
F Bellia1, V Lanza1, S García-Viñuales1
1Consiglio Nazionale delle Ricerche , Istituto di Biostrutture e Bioimmagini , Via P. Gaifami 18 , 95126 Catania , Italy .
Chemical Science
|April 19, 2019
Summary
Alzheimer's disease involves impaired protein clearance. This study shows amyloid-beta binds ubiquitin, affecting its aggregation and degradation, potentially impacting proteostasis in Alzheimer's disease.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Alzheimer's Disease (AD) is linked to impaired proteostasis and reduced Ubiquitin Proteasome System (UPS) activity.
- Amyloid-beta (Aβ) peptides are implicated in AD pathogenesis, and ubiquitin (Ub) is found in amyloid plaques.
Purpose of the Study:
- To investigate whether ubiquitin (Ub) binds to amyloid-beta (Aβ) peptides.
- To determine the effect of Ub binding on Aβ clearance pathways and aggregation.
Main Methods:
- Utilized MALDI-TOF/UPLC-HRMS, fluorescence, NMR, SPR, Microscale Thermophoresis (MST), and molecular dynamics.
- Performed ELISA assays in neuroblastoma cell lysates.
- Investigated the impact on Insulin Degrading Enzyme (IDE) degradation and Ub chain growth.
Main Results:
- Demonstrated Aβ40 binds Ub with 1:1 stoichiometry and a high micromolar dissociation constant (Kd).
- Identified specific interaction sites between Aβ N-terminus and Ub C-terminus, inducing structural changes in Aβ.
- Showed Ub-bound Aβ aggregates less, degrades slower via IDE, and Aβ1-16 inhibits Ub chain formation.
Conclusions:
- The non-covalent interaction between Aβ and Ub influences upstream UPS events.
- This interaction may play a role in the proteome maintenance malfunction observed in Alzheimer's Disease.
- Suggests potential therapeutic targets related to Aβ-Ub interactions in AD.
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