Abstract

SDS-concentration-dependent alpha-synuclein structure: Upon interaction with SDS, alpha Syn folds into a structure with two antiparallel alpha-helices. We show from single-molecule FRET that alpha Synn adopts this conformation in an all-or-none fashion below the SDS critical micelle concentration. Population of the folded species is directly coupled to an increase in alpha-helix content; this suggests that the entire N terminus is involved in the transaction.

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