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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Amyloid Fibrils03:03

Amyloid Fibrils

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Purification and Aggregation of the Amyloid Precursor Protein Intracellular Domain
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Reversing the Fold: Polyanionic Macrocycle Dissolves αA66-80 Crystallin Peptide Aggregates.

Frank Boateng Osei1, Yuvraj Dangat2, Roi Yasay1

  • 1Department of Chemistry, Oakland University, 146 Library Drive, Rochester, Michigan 48309-4479, United States.

Biomacromolecules
|June 13, 2026
PubMed
Summary
This summary is machine-generated.

A novel compound, MR-8S, effectively breaks down protein aggregates linked to cataract formation. This resorcinarene derivative shows significant deaggregation capabilities, offering potential for new anticataract drug development.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Ophthalmology

Background:

  • Cataract is a primary cause of global blindness with no effective pharmacological treatments.
  • Protein aggregation, specifically of alphaA-Crystallin peptide (αA66-80), is implicated in cataract pathogenesis.
  • Existing treatments primarily involve surgical intervention.

Purpose of the Study:

  • To synthesize and evaluate the efficacy of octa-sulfonated polyanionic resorcinarene (MR-8S) in inhibiting and deaggregating αA66-80-Crystallin peptide aggregates.
  • To investigate the interaction mechanisms between MR-8S and the αA66-80-Crystallin peptide.
  • To assess MR-8S as a potential therapeutic scaffold for anticataract drug development.

Main Methods:

  • Synthesis of octa-sulfonated polyanionic resorcinarene (MR-8S).
  • Nuclear Magnetic Resonance (NMR) and Isothermal Titration Calorimetry (ITC) to study molecular interactions.
  • Fluorescence aggregation assays, Dynamic Light Scattering (DLS), and Transmission Electron Microscopy (TEM) for deaggregation studies.
  • Molecular Dynamics (MD) simulations to elucidate aggregation mechanisms.

Main Results:

  • MR-8S demonstrated strong binding interactions with the αA66-80-Crystallin peptide, with dissociation constants ranging from 1 nM to 1000 μM.
  • MR-8S exhibited concentration-dependent deaggregation of αA66-80-Crystallin peptide aggregates, significantly reducing particle size.
  • MR-8S showed superior deaggregation efficacy compared to previously reported macrocycles and other polyionic resorcinarenes, with a lower effective concentration (44 ± 1 μM) to break down 50% of aggregates.
  • MD simulations indicated that MR-8S shields hydrophobic residues, preventing peptide aggregation.

Conclusions:

  • MR-8S effectively inhibits and deaggregates αA66-80-Crystallin peptide aggregates, addressing a key mechanism in cataract formation.
  • The strong binding affinity and deaggregation capabilities of MR-8S highlight its potential as a therapeutic agent.
  • MR-8S represents a promising molecular scaffold for the development of novel anticataract pharmacological treatments.