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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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Published on: November 21, 2013

Single homopolypeptide chains collapse into mechanically rigid conformations.

Lorna Dougan1, Jingyuan Li, Carmen L Badilla

  • 1Department of Biological Sciences, Columbia University, New York, NY 10027, USA. l.dougan@leeds.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|June 25, 2009
PubMed
Summary

Huntington's disease polyglutamine (polyQ) chains form rigid, collapsed structures that resist unfolding. This mechanical stability may contribute to the accumulation of toxic protein aggregates in the brain.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Neuroscience

Background:

  • Huntington's disease involves polyglutamine (polyQ) expansions in huntingtin protein, leading to aggregation.
  • Understanding individual polyQ chain mechanics is crucial but poorly understood.

Purpose of the Study:

  • To directly probe the mechanical properties of single polyglutamine (polyQ) chains.
  • To investigate the conformational states and mechanical resilience of polyQ sequences.

Main Methods:

  • Utilized a single-molecule force-clamp technique to measure polyQ chain extension under force.
  • Engineered polyQ constructs of varying lengths, flanked by I27 titin modules.
  • Employed molecular dynamics simulations with heat-annealing to explore conformational space.

Main Results:

  • Single polyQ chains exhibited no extension under force, unlike random coil proteins.
  • PolyQ chains form mechanically stable, collapsed structures resistant to unfolding.
  • Proline interruptions altered mechanical extensibility, confirming structural resilience.
  • Molecular dynamics revealed stable, compact globular conformations for polyQ.

Conclusions:

  • Polyglutamine chains adopt mechanically stable, collapsed conformations.
  • The rigidity of these structures may overwhelm proteasomal degradation, leading to aggregate accumulation.
  • These findings offer new insights into Huntington's disease pathogenesis at the molecular level.