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Related Experiment Video

Updated: Jun 30, 2025

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Decreased Water Mobility Contributes To Increased α-Synuclein Aggregation.

Amberley D Stephens1, Johanna Kölbel1, Rani Moons2

  • 1Department of Chemical Engineering and Biotechnology University of Cambridge UK.

Angewandte Chemie (Weinheim an Der Bergstrasse, Germany)
|March 22, 2024
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Summary

Solvent mobility impacts amyloid protein aggregation. Reduced water and protein mobility accelerates alpha-synuclein aggregation, a key factor in Parkinson

Keywords:
AmyloidHydration ShellHydrogen BondSolvation ShellSolvent

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Area of Science:

  • Biochemistry
  • Biophysics
  • Neuroscience

Background:

  • The solvation shell is crucial for protein folding and function.
  • The role of solvation shell dynamics in protein misfolding and aggregation remains unclear.
  • Alpha-synuclein (αSyn) aggregation is linked to Parkinson's disease.

Purpose of the Study:

  • To investigate the influence of solvation shell water molecule mobility on alpha-synuclein aggregation.
  • To determine the effect of different salts and solvents on αSyn aggregation rates.
  • To elucidate the mechanisms by which solvent mobility affects αSyn aggregation.

Main Methods:

  • Studied the aggregation rate of αSyn under varying solvent conditions (H2O, D2O) and salt concentrations (NaCl, CsI).
  • Measured the mobility of solvation shell water molecules and αSyn.
  • Analyzed αSyn structural conformations.

Main Results:

  • Reduced water mobility in the solvation shell, induced by NaCl, increased αSyn aggregation rates.
  • Increased water mobility, induced by CsI, decreased αSyn aggregation rates.
  • Switching to D2O as a solvent also increased aggregation rates, indicating a solvent-driven effect.
  • Increased aggregation correlated with reduced mobility of both water and αSyn, not solely with conformational changes.

Conclusions:

  • Solvation shell water mobility is a critical factor influencing αSyn aggregation.
  • Reduced mobility of both solvent and protein promotes intermolecular interactions and aggregation.
  • These findings offer new insights into the mechanisms of protein misfolding in neurodegenerative diseases like Parkinson's.