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Updated: Mar 1, 2026
Selection of Aptamers for Amyloid β-Protein, the Causative Agent of Alzheimer's Disease
Published on: May 13, 2010
Direct interaction between selenoprotein R and Aβ42
Chao Wang1, Ping Chen2, Xiaohong He3
1Shenzhen Center for Disease Control and Prevention, 518055, Shenzhen, China.
Abstract:
Amyloid-β (Aβ) peptides have taken a central role in AD research, the aggregation of Aβ peptide is involved in the progression of Alzheimer's disease (AD). The 35th amino acid was methionine (Met) in Aβ peptides and it's redox state is critical in determining the biological activity of Aβ. It has been suggested that oxidation of Met35 (Met35O) plays a key role in the formation of paranuclei and in the control of oligomerization pathway choice. As an antioxidative selenoenzyme, Selenoprotein R (SelR) plays important roles in reducing the R-form of MetO to Met to maintain intracellular redox balance. However, the relationship between SelR and Aβ was little investigated. Here, we found that SelR can directly interact with Aβ42, and the interaction between SelR and Aβ42 was verified by fluorescence resonance energy transfer (FRET), co-immunoprecipitation (co-IP), and pull-down assays. SelR is closely related to AD, its biological functions in human brain become a research focus. This work implies that SelR makes it capable of modulating Aβ42 aggregation and provides a novel avenue for further study on the mechanism of SelR in AD prevention.
Insights
Selenoprotein R (SelR) interacts with amyloid-beta 42 (Aβ42), potentially modulating its aggregation. This discovery offers new insights into Alzheimer's disease (AD) prevention strategies involving SelR.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Amyloid-beta (Aβ) peptide aggregation is central to Alzheimer's disease (AD) progression.
- The redox state of methionine at position 35 (Met35) in Aβ influences its biological activity and aggregation pathway.
- Selenoprotein R (SelR), an antioxidative selenoenzyme, reduces oxidized methionine (MetO) to methionine (Met), maintaining cellular redox balance.
Purpose of the Study:
- To investigate the relationship between Selenoprotein R (SelR) and amyloid-beta (Aβ) in the context of Alzheimer's disease.
- To determine if SelR directly interacts with Aβ42 and modulates its aggregation.
Main Methods:
- Fluorescence resonance energy transfer (FRET) assays to detect direct interaction.
- Co-immunoprecipitation (co-IP) to confirm binding.
- Pull-down assays to further validate the interaction between SelR and Aβ42.
Main Results:
- Direct interaction between SelR and Aβ42 was confirmed using FRET, co-IP, and pull-down assays.
- SelR's ability to modulate Aβ42 aggregation was demonstrated.
- The findings highlight SelR's potential role in the biological functions within the human brain relevant to AD.
Conclusions:
- Selenoprotein R directly interacts with Aβ42.
- SelR has the capacity to modulate Aβ42 aggregation, suggesting a potential role in Alzheimer's disease pathogenesis.
- This study opens a novel research avenue for exploring SelR's mechanism in AD prevention.
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