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Protease-activated alpha-2-macroglobulin can inhibit amyloid formation via two distinct mechanisms.

FEBS Lett.2013 Mar 1;587(5):398-403. Epub 2013 Jan 23
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摘要


α(2)-Macroglobulin (α(2)M) is an extracellular chaperone that inhibits amorphous and fibrillar protein aggregation. The reaction of α(2)M with proteases results in an 'activated' conformation, where the proteases become covalently-linked within the interior of a cage-like structure formed by α(2)M. This study investigates, the effect of activation on the ability of α(2)M to inhibit amyloid formation by Aβ(1-42) and I59T human lysozyme and shows that protease-activated α(2)M can act via two distinct mechanisms: (i) by trapping proteases that remain able to degrade polypeptide chains and (ii) by a chaperone action that prevents misfolded clients from continuing along the amyloid forming pathway.

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