Abstract
alpha-Synuclein is a small cytosolic protein of presynaptic nerve terminals composed of seven 11-residue repeats and a hydrophilic tail. alpha-Synuclein misfolding and dysfunction may contribute to the pathogenesis of Parkinson's disease and neurodegenerative dementias, but its normal folding and function are unknown. In solution, alpha-synuclein is natively unstructured but assumes an alpha-helical conformation upon binding to phospholipid membranes. We now show that this conformation of alpha-synuclein consists of two alpha-helical regions that are interrupted by a short break. The structural organization of the alpha-helices of alpha-synuclein was not anticipated by sequence analyses and may be important for its pathogenic role.
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