4.5 Article

Stability of a Recently Found Triple-β-Stranded Aβ1-42 Fibril Motif

期刊

JOURNAL OF PHYSICAL CHEMISTRY B
卷 120, 期 20, 页码 4548-4557

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.6b01724

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资金

  1. NSF [CHE-1266256]
  2. OCAST [HR14-129]
  3. Division Of Chemistry
  4. Direct For Mathematical & Physical Scien [1266256] Funding Source: National Science Foundation

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Amyloid-beta peptides form polymorphous amyloid fibrils are correlated with the pathogenesis of Alzheimer's disease. Recently, a new ssNMR high-resolution structure has been reported for wild-type A beta 1-42 fibrils that is characterized by a strand-turn-strand-turn-strand motif instead of the U-shape form seen in previously known wild-type A beta-fibril structures. Analyzing molecular dynamics simulations we comment on the relative weight of the new fibril structure and present evidence that its stability depends on hydrophobic contacts involving the C-terminal residues I41 and A42, but not on the salt bridge K28-A42. We further argue that A beta 1-42 peptides with this structure may assemble in fibrils with a 2-fold packing symmetry and discuss two possible arrangements.

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