An early folding contact between Phe19 and Leu34 is critical for amyloid-β oligomer toxicity.

Abstract:

:Small hydrophobic oligomers of aggregation-prone proteins are thought to be generically toxic. Here we examine this view by perturbing an early folding contact between Phe19 and Leu34 formed during the aggregation of Alzheimer's amyloid-β (Aβ40) peptide. We find that even conservative single mutations altering this interaction can abolish Aβ40 toxicity. Significantly, the mutants are not distinguishable either by the oligomers size or by the end-state fibrillar structure from the wild type Aβ40. We trace the change in their toxicity to a drastic lowering of membrane affinity. Therefore, nonlocal folding contacts play a key role in steering the oligomeric intermediates through specific conformations with very different properties and toxicity levels. Our results suggest that engineering the folding energy landscape may provide an alternative route to Alzheimer therapeutics.

journal_name

ACS Chem Neurosci

authors

Das AK,Rawat A,Bhowmik D,Pandit R,Huster D,Maiti S

doi

10.1021/acschemneuro.5b00074

subject

Has Abstract

pub_date

2015-08-19 00:00:00

pages

1290-5

issue

8

issn

1948-7193

journal_volume

6

pub_type

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