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 Neuroscijournal_title
ACS chemical neuroscienceauthors
Das AK,Rawat A,Bhowmik D,Pandit R,Huster D,Maiti Sdoi
10.1021/acschemneuro.5b00074subject
Has Abstractpub_date
2015-08-19 00:00:00pages
1290-5issue
8issn
1948-7193journal_volume
6pub_type
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