Stabilizing Off-pathway Oligomers by Polyphenol Nanoassemblies for IAPP Aggregation Inhibition

Area of Science:

• Biochemistry
• Computational Biology
• Materials Science

Background:

• Naturally occurring polyphenols exhibit protein aggregation inhibitory effects.
• Islet amyloid polypeptide (IAPP), also known as amylin, is implicated in protein aggregation disorders.

Purpose of the Study:

• To investigate the anti-aggregation effects of curcumin and resveratrol on IAPP.
• To elucidate the molecular mechanisms underlying polyphenol-mediated IAPP aggregation inhibition.

Main Methods:

• Discrete Molecular Dynamics (DMD) simulations were employed to model IAPP aggregation.
• High-throughput Dynamic Light Scattering (DLS) experiments were conducted to validate simulation findings.

Main Results:

• DMD simulations revealed that polyphenols stabilize small molecular weight IAPP off-pathway oligomers.
• Hydrogen bonds, π-π stacking, and hydrophobic interactions mediate IAPP-polyphenol stabilization.
• DLS confirmed the presence of stable, nanometer-sized oligomers for up to 7.5 hours.

Conclusions:

• Polyphenols, including curcumin and resveratrol, exhibit significant anti-aggregation effects on IAPP.
• A general anti-aggregation mechanism involving oligomer stabilization by polyphenols was proposed.
• The study provides a computational framework for designing novel anti-amyloid aggregation therapeutics.