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Small Heat-shock Proteins Prevent α-Synuclein Aggregation via Transient Interactions and Their Efficacy Is Affected by the Rate of Aggregation.

J Biol Chem. 2016; 
Cox D,, Selig E, Griffin MD, Carver JA, Ecroyd H,.
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摘要

The aggregation of α-synuclein (α-syn) into amyloid fibrils is associated with neurodegenerative diseases, collectively referred to as the α-synucleinopathies. In vivo, molecular chaperones, such as the small heat-shock proteins (sHsps), normally act to prevent protein aggregation; however, it remains to be determined how aggregation-prone α-syn evades sHsp chaperone action leading to its disease-associated deposition. This work examines the molecular mechanism by which two canonical sHsps, αB-crystallin (αB-c) and Hsp27, interact with aggregation-prone α-syn to prevent its aggregation in vitro Both sHsps are very effective inhibitors of α-syn aggregation, but no stable complex between the sHsps and α-... More

关键词

Parkinson disease; amyloid; analytical ultracentrifugation; fibril; molecular chaperone; protein aggregation; small heat shock protein (sHsp); synuclein; α-synuclein (a-synuclein)