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Dihydroxybenzoic acid isomers differentially dissociate soluble biotinyl-Aβ(1-42) oligomers
Harry LeVine1, Levi Lampe, Lina Abdelmoti
1Department of Cellular and Molecular Biochemistry, Center on Aging, Center for Structural Biology, University of Kentucky, Lexington, Kentucky 40506, United States. hlevine@email.uky.edu
Certain benzoic acid derivatives can break apart amyloid-beta (Aβ) oligomers, while gallic acid stabilizes them. This research explores small molecules for potential Aβ oligomer dissociation therapies.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Polyphenolic compounds influence amyloid-beta (Aβ) fibril and oligomer formation and morphology.
- Small molecule screens identified benzoic acid derivatives with varying abilities to affect Aβ oligomers.
Purpose of the Study:
- To investigate the effects of simple benzoic acid derivatives on preformed amyloid-beta (Aβ) oligomers.
- To understand the mechanism of action for Aβ oligomer dissociation and stabilization.
Main Methods:
- Screening of a small molecule diversity library for lead structures.
- Testing dihydroxybenzoic acid (DHBA) isomers for their ability to dissociate biotinyl-Aβ(1-42) oligomers.
- Evaluating the effect of gallic acid on Aβ oligomer stability and dissociation.
Main Results:
- Specific DHBA isomers (2,3-, 2,5-, and 3,4-DHBA) effectively dissociated preformed Aβ oligomers.
- Inactive DHBA isomers, monohydroxy, and unsubstituted benzoic acids did not affect oligomer dissociation.
- Gallic acid stabilized Aβ oligomers and blocked the dissociating effects of active DHBAs.
- Compounds did not inhibit oligomer assembly, suggesting they do not interact with Aβ monomers.
Conclusions:
- Dihydroxybenzoic acids destabilize Aβ oligomers, promoting monomer dissociation.
- Gallic acid stabilizes Aβ oligomers, counteracting the effects of dissociators.
- These findings offer insights into small molecule-based strategies for modulating Aβ oligomer dynamics.
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