Journal article
Solvent and mutation effects on the nucleation of amyloid $\beta$-protein folding
Proceedings of the National Academy of Sciences - PNAS, v 102(51), pp 18258-18263
26 Oct 2005
PMID: 16339896
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Experimental evidence suggests that the folding and aggregation of the
amyloid $\beta$-protein (A$\beta$) into oligomers is a key pathogenetic event
in Alzheimer's disease (AD). Inhibiting the pathologic folding and
oligomerization of A$\beta$ could be effective in the prevention and treatment
of AD. Here, using all-atom molecular dynamics simulations in explicit solvent,
we probe the initial stages of folding of a decapeptide segment of A$\beta$,
A$\beta_{21-30}$, shown experimentally to nucleate the folding process. In
addition, we examine the folding of a homologous decapeptide containing an
amino acid substitution linked to hereditary cerebral hemorrhage with
amyloidosis--Dutch type, [Gln22]A$\beta_{21-30}$. We find that: (i) when the
decapeptide is in water, hydrophobic interactions and transient salt bridges
between Lys28 and either Glu22 or Asp23 are important in the formation of a
loop in the Val24--Lys28 region of the wild type decapeptide; (ii) in the
presence of salt ions, salt bridges play a more prominent role in the
stabilization of the loop; (iii) in water with a reduced density, the
decapeptide forms a helix, indicating the sensitivity of folding to different
aqueous environments; (iv) the ``Dutch'' peptide in water, in contrast to the
wild type peptide, fails to form a long-lived Val24--Lys28 loop, suggesting
that loop stability is a critical factor in determining whether A$\beta$ folds
into pathologic structures. Our results are relevant to understand the
mechanism of A$\beta$ peptide folding in different environments, such as intra-
and extracellular milieus or cell membranes, and how amino acid substitutions
linked to familial forms of amyloidosis cause disease.
Metrics
Details
- Title
- Solvent and mutation effects on the nucleation of amyloid $\beta$-protein folding
- Creators
- Luis CruzBrigita UrbancJose M BorregueroNoel D LazoDavid B TeplowH. Eugene Stanley
- Publication Details
- Proceedings of the National Academy of Sciences - PNAS, v 102(51), pp 18258-18263
- Publisher
- PNAS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000234174300005
- Scopus ID
- 2-s2.0-29444439999
- Other Identifier
- 991014878029704721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Biochemistry & Molecular Biology