Trehalose induced conformational changes in the amyloid-β peptide

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Alzheimer's disease (AD) is characterized by Amyloid-β (Aβ) peptide accumulation, forming plaques that lead to cognitive decline.
• Aβ aggregation involves conformational changes from soluble peptides to β-sheet structures, forming insoluble fibrils.
• Small molecules like trehalose show promise in preventing Aβ aggregation, but their precise mechanism remains unclear.

Purpose of the Study:

• To investigate the role of trehalose in modulating Aβ peptide conformation and aggregation.
• To elucidate the molecular mechanisms by which trehalose may inhibit Aβ-induced pathology.

Main Methods:

• Utilized circular dichroism spectroscopy to analyze peptide structural changes.
• Employed fluorescence emission spectroscopy to monitor conformational transitions.
• Investigated the effect of trehalose on Aβ peptide structure in vitro.

Main Results:

• In the presence of trehalose, Aβ peptide exhibited increased helical content.
• Trehalose induced a disorder-to-order conformational transition in Aβ peptides.
• Findings suggest trehalose promotes the formation of α-helical structures over β-sheets.

Conclusions:

• Trehalose directly influences Aβ peptide conformation, favoring α-helical structures.
• This conformational shift may inhibit the formation of pathological β-sheet structures, thereby reducing Aβ aggregation.
• Trehalose represents a potential therapeutic strategy for mitigating Alzheimer's disease progression by targeting Aβ conformational dynamics.