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The molecular chaperone Hsp90 modulates intermediate steps of amyloid assembly of the Parkinson-related protein alpha-synuclein.


ABSTRACT: Alpha-synuclein is an intrinsically unstructured protein that binds to membranes, forms fibrils, and is involved in neurodegeneration. We used a reconstituted in vitro system to show that the molecular chaperone Hsp90 influenced alpha-synuclein vesicle binding and amyloid fibril formation, two processes that are tightly coupled to alpha-synuclein folding. Binding of Hsp90 to monomeric alpha-synuclein occurred in the low micromolar range, involving regions of alpha-synuclein that are critical for vesicle binding and amyloidogenesis. As a consequence, both processes were affected. In the absence of ATP, the accumulation of non-amyloid alpha-synuclein oligomers prevailed over fibril formation, whereas ATP favored fibril growth. This suggests that Hsp90 modulates the assembly of alpha-synuclein in an ATP-dependent manner. We propose that Hsp90 affects these folding processes by restricting conformational fluctuations of alpha-synuclein.

SUBMITTER: Falsone SF 

PROVIDER: S-EPMC2781518 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature

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The molecular chaperone Hsp90 modulates intermediate steps of amyloid assembly of the Parkinson-related protein alpha-synuclein.

Falsone S Fabio SF   Kungl Andreas J AJ   Rek Angelika A   Cappai Roberto R   Zangger Klaus K  

The Journal of biological chemistry 20090915 45


Alpha-synuclein is an intrinsically unstructured protein that binds to membranes, forms fibrils, and is involved in neurodegeneration. We used a reconstituted in vitro system to show that the molecular chaperone Hsp90 influenced alpha-synuclein vesicle binding and amyloid fibril formation, two processes that are tightly coupled to alpha-synuclein folding. Binding of Hsp90 to monomeric alpha-synuclein occurred in the low micromolar range, involving regions of alpha-synuclein that are critical for  ...[more]

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