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Benchmarking of copper(II) LFMM parameters for studying amyloid-β peptides.

Shaun T Mutter1, Robert J Deeth2, Matthew Turner1

  • 1a School of Chemistry , Cardiff University , Park Place, Cardiff CF10 3AT , UK.

Journal of Biomolecular Structure & Dynamics
|April 1, 2017
PubMed
Summary

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This study benchmarks ligand field molecular mechanics (LFMM) for copper (II) in amyloid-β peptides. LFMM accurately predicts copper coordination geometry, crucial for understanding peptide interactions and potential therapeutic targets.

Area of Science:

  • Computational chemistry
  • Biophysics
  • Metalloprotein chemistry

Background:

  • Copper (II) ions are implicated in amyloid-β peptide aggregation, a hallmark of Alzheimer's disease.
  • Accurate modeling of copper-peptide interactions is essential for understanding disease mechanisms and developing therapeutics.

Purpose of the Study:

  • To benchmark ligand field molecular mechanics (LFMM) parameters for copper (II) interactions with the amyloid-β1-16 peptide fragment.
  • To assess the accuracy of LFMM in reproducing copper coordination geometries.

Main Methods:

  • Density functional theory (DFT) optimization of small test models representing copper coordination modes.
  • Ligand field molecular dynamics (LFMD) simulations of copper-bound amyloid-β1-16.
  • Geometry optimization of trajectory snapshots using DFT and the PM7 semi-empirical method.
Keywords:
amyloid-beta peptidecopperligand field molecular mechanicsmolecular dynamics

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Main Results:

  • LFMM parameters show high accuracy for copper bond lengths and angles (<0.1 Å, <5° error) compared to DFT.
  • LFMD simulations combined with DFT/PM7 optimization show good agreement with LFMM.
  • The peptide backbone contributes most to geometric differences; the copper coordination sphere is well-reproduced by LFMM.
  • PM7 method demonstrates excellent performance against LFMM (0.2 Å average RMSD).

Conclusions:

  • LFMM is a reliable method for modeling copper (II) coordination in amyloid-β peptides.
  • The N-terminal carbonyl moiety can act as a weakly bound fifth ligand, influencing copper coordination dynamics.
  • Accurate computational modeling aids in understanding copper's role in amyloid pathology.