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Related Experiment Videos

A broken alpha -helix in folded alpha -Synuclein.

Sreeganga Chandra1, Xiaocheng Chen, Josep Rizo

  • 1Center for Basic Neuroscience, Department of Molecular Genetics, and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9111, USA. Sreeganga.Chandra@UTSouthwestern.edu

The Journal of Biological Chemistry
|February 15, 2003
PubMed
Summary

Alpha-synuclein, implicated in Parkinson's disease, is natively unstructured. Upon binding membranes, it forms two alpha-helices, a novel structure potentially key to its role in neurodegeneration.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Alpha-synuclein is a small protein found in nerve terminals.
  • Its misfolding and dysfunction are linked to Parkinson's disease and other neurodegenerative dementias.
  • The normal folding and function of alpha-synuclein remain largely unknown.

Purpose of the Study:

  • To investigate the structural conformation of alpha-synuclein when bound to phospholipid membranes.
  • To elucidate the structural organization of alpha-synuclein's alpha-helical regions.

Main Methods:

  • Analysis of alpha-synuclein structure in solution and upon binding to phospholipid membranes.
  • Structural characterization using biophysical techniques (details not provided in abstract).

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Main Results:

  • Alpha-synuclein is natively unstructured in solution.
  • Upon binding to phospholipid membranes, alpha-synuclein adopts an alpha-helical conformation.
  • This helical conformation is characterized by two distinct alpha-helical regions separated by a short break.
  • This specific structural organization was not predicted by sequence analysis.

Conclusions:

  • The membrane-bound conformation of alpha-synuclein reveals a unique structural organization with two interrupted alpha-helices.
  • This unanticipated structure may be crucial for the protein's role in the pathogenesis of neurodegenerative diseases like Parkinson's.